reorganized and renamed classes

# Conflicts:
#	src/generated/resources/.cache/59eb3dbb5f86130e09b3c62d89b9525ee01cf52d
#	src/generated/resources/.cache/a8139181fab9cfd94e67697230cbaca839a05e1f
#	src/main/java/net/xevianlight/aphelion/core/init/ModItems.java

.gitignore

@@ -23,4 +23,4 @@ run
 runs
 run-data
 
-repo
+repo

src/generated/resources/.cache/59eb3dbb5f86130e09b3c62d89b9525ee01cf52d

@@ -1,9 +1,11 @@
-// 1.21.1	2026-01-28T08:47:15.3186366	Loot Tables
+// 1.21.1	2026-02-04T21:03:31.3164337	Loot Tables
 69d8318ddba171526d1fabb87d9d93548ed8598e data/aphelion/loot_table/blocks/arc_furnace_casing.json
 05f08985e601d30116f67e2f07b48b03b40cdca6 data/aphelion/loot_table/blocks/block_steel.json
 ff43a9c3741faf10b1e156a7a74d5cfb035cc118 data/aphelion/loot_table/blocks/dimension_changer.json
 b63130d9c10485676303d729807b6fcaac080294 data/aphelion/loot_table/blocks/electric_arc_furnace.json
+b9cfe672ead8e2673a7b2f5c4cec831e7e8e7040 data/aphelion/loot_table/blocks/launch_pad.json
 afb6519a03415b8e0d5bafc9fadb70905a398046 data/aphelion/loot_table/blocks/oxygen_test_block.json
+f3178154dadee30cc28f5ff23af45be98f2766cf data/aphelion/loot_table/blocks/rocket_assembler_block.json
 1ab50c99e9f478840b9d003fd56ebdcab12fbbce data/aphelion/loot_table/blocks/test_block.json
 7d8eeb99a1bc942a6e2cf292b21fd4534062b5ab data/aphelion/loot_table/blocks/vacuum_arc_furnace_controller.json
 797bf9839d79e08b4832c9eaf3cb303b0471ed0c data/aphelion/loot_table/blocks/vaf_dummy_block.json

src/generated/resources/.cache/9c517586575525115dfb9b0c4d592f540cb43d3e

@@ -1,4 +1,5 @@
-// 1.21.1	2026-01-23T22:32:50.7214756	Tags for minecraft:block mod id aphelion
+// 1.21.1	2026-01-26T19:04:46.4981336	Tags for minecraft:block mod id aphelion
+46f0160a007d32a06624ad98f25e8a1a8d01bb08 data/aphelion/tags/block/launch_pad.json
 058c56a0c17204ed5d9cadaffae84292b4752213 data/c/tags/block/storage_blocks.json
 058c56a0c17204ed5d9cadaffae84292b4752213 data/c/tags/block/storage_blocks/steel.json
 7d420216f15b8f78d2a3b298f9bb773a9e5f79c3 data/minecraft/tags/block/mineable/pickaxe.json

src/generated/resources/.cache/a8139181fab9cfd94e67697230cbaca839a05e1f

@@ -1,18 +1,21 @@
-// 1.21.1	2026-01-28T08:47:15.3176368	Block States: aphelion
+// 1.21.1	2026-02-04T21:03:31.3154339	Block States: aphelion
 851ff42f7b21dec86107c8e0cefb3934ae4ebc08 assets/aphelion/blockstates/block_steel.json
 30b9c0efd7aaadb5412d98e4568f98b3632adbb9 assets/aphelion/blockstates/dimension_changer.json
 cb4287104006c80c8396b290ab5258df65d62cef assets/aphelion/blockstates/electric_arc_furnace.json
 28131a570d3666b7f323de4ad8a69e52ceec92e2 assets/aphelion/blockstates/oxygen_test_block.json
+85c7c0dab53d0219b315c822147a90ade9075844 assets/aphelion/blockstates/rocket_assembler_block.json
 b86c50fddcf6c8c6c19cb748529239d5962a3ede assets/aphelion/blockstates/test_block.json
 a810b97f4dace35d026f28d96cb9c47c93600d75 assets/aphelion/models/block/block_steel.json
 2d3592b7ab7132908709243e97540151e0fb762e assets/aphelion/models/block/dimension_changer.json
 5f7e8674070f31a63875b5d6147153bfa0eef61a assets/aphelion/models/block/electric_arc_furnace.json
 746f23f150a01524ad03cbd1eb822bfbb7cf453b assets/aphelion/models/block/oxygen_test_block.json
+17eb7327e504f7a88028af804e046281d9719fdf assets/aphelion/models/block/rocket_assembler_block.json
 e0971228b4a1c4bc9dbab58a7dacdc3ae6037e02 assets/aphelion/models/block/test_block.json
 cdc831b0f1c462be64825fd34bd446e5b95afac6 assets/aphelion/models/item/arc_furnace_casing.json
 3599f9037eb2f66de1765318b97ab564c3eae92f assets/aphelion/models/item/block_steel.json
 db0ec473a016ce05c258cde18a217d47a9ea8324 assets/aphelion/models/item/dimension_changer.json
 279080c06ada87f54fd0a7b885b256dbe25a946a assets/aphelion/models/item/electric_arc_furnace.json
 24cf60e70f7d9450b0e70cf017662e80971bae17 assets/aphelion/models/item/oxygen_test_block.json
+dafa6e1a3cfd753e211ae94179a433c69e9d2a28 assets/aphelion/models/item/rocket_assembler_block.json
 74418ef1cf678e72e7534924274688ef5a68af0e assets/aphelion/models/item/test_block.json
 88ca3602517e99f7feaed57eddfc96965a25761c assets/aphelion/models/item/vacuum_arc_furnace_controller.json

src/generated/resources/assets/aphelion/models/item/rocket_assembler_block.json

@@ -0,0 +1,3 @@
+{
+  "parent": "aphelion:block/rocket_assembler_block"
+}

src/generated/resources/data/aphelion/loot_table/blocks/launch_pad.json

@@ -0,0 +1,21 @@
+{
+  "type": "minecraft:block",
+  "pools": [
+    {
+      "bonus_rolls": 0.0,
+      "conditions": [
+        {
+          "condition": "minecraft:survives_explosion"
+        }
+      ],
+      "entries": [
+        {
+          "type": "minecraft:item",
+          "name": "aphelion:launch_pad"
+        }
+      ],
+      "rolls": 1.0
+    }
+  ],
+  "random_sequence": "aphelion:blocks/launch_pad"
+}

src/generated/resources/data/aphelion/loot_table/blocks/rocket_assembler_block.json

@@ -0,0 +1,21 @@
+{
+  "type": "minecraft:block",
+  "pools": [
+    {
+      "bonus_rolls": 0.0,
+      "conditions": [
+        {
+          "condition": "minecraft:survives_explosion"
+        }
+      ],
+      "entries": [
+        {
+          "type": "minecraft:item",
+          "name": "aphelion:rocket_assembler_block"
+        }
+      ],
+      "rolls": 1.0
+    }
+  ],
+  "random_sequence": "aphelion:blocks/rocket_assembler_block"
+}

src/generated/resources/data/aphelion/tags/block/launch_pad.json

@@ -0,0 +1,5 @@
+{
+  "values": [
+    "aphelion:launch_pad"
+  ]
+}

src/main/java/net/xevianlight/aphelion/Aphelion.java

@@ -1,16 +1,24 @@
 package net.xevianlight.aphelion;
 
+import net.minecraft.client.Minecraft;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerPlayer;
 import net.neoforged.api.distmarker.Dist;
 import net.neoforged.fml.common.EventBusSubscriber;
 import net.neoforged.fml.event.lifecycle.FMLClientSetupEvent;
+import net.neoforged.neoforge.client.event.ClientTickEvent;
 import net.neoforged.neoforge.client.event.EntityRenderersEvent;
 import net.neoforged.neoforge.client.event.RegisterMenuScreensEvent;
 import net.neoforged.neoforge.client.extensions.common.RegisterClientExtensionsEvent;
 import net.neoforged.neoforge.event.AddReloadListenerEvent;
+import net.neoforged.neoforge.event.tick.ServerTickEvent;
+import net.neoforged.neoforge.network.PacketDistributor;
 import net.xevianlight.aphelion.block.dummy.renderer.MultiblockDummyRenderer;
 import net.xevianlight.aphelion.block.entity.custom.renderer.OxygenTestRenderer;
+import net.xevianlight.aphelion.block.entity.custom.renderer.RocketAssemblerBlockEntityRenderer;
 import net.xevianlight.aphelion.client.AphelionConfig;
+import net.xevianlight.aphelion.core.saveddata.EnvironmentSavedData;
+import net.xevianlight.aphelion.network.packet.PartitionPayload;
 import net.xevianlight.aphelion.planet.AphelionPlanetJSONLoader;
 import net.xevianlight.aphelion.core.init.*;
 import net.xevianlight.aphelion.fluid.BaseFluidType;
@@ -132,7 +140,8 @@ public class Aphelion {
         @SubscribeEvent
         public static void registerBER(EntityRenderersEvent.RegisterRenderers event) {
             event.registerBlockEntityRenderer(ModBlockEntities.VAF_MULTIBLOCK_DUMMY_ENTITY.get(), MultiblockDummyRenderer::new);
-            event.registerBlockEntityRenderer(ModBlockEntities.OXYGEN_TEST_BLOCK_ENTITY.get(), OxygenTestRenderer::new);
+            event.registerBlockEntityRenderer(ModBlockEntities.ROCKET_ASSEMBLER_BLOCK_ENTITY.get(), RocketAssemblerBlockEntityRenderer::new);
+//            event.registerBlockEntityRenderer(ModBlockEntities.OXYGEN_TEST_BLOCK_ENTITY.get(), OxygenTestRenderer::new);
         }
 
         @SubscribeEvent
@@ -146,5 +155,11 @@ public class Aphelion {
         public static void registerRenderers(EntityRenderersEvent.RegisterRenderers event) {
             event.registerEntityRenderer(ModEntities.ROCKET.get(), RocketRenderer::new);
         }
+
+        @SubscribeEvent
+        public static void onClientTick(ClientTickEvent.Post e) {
+            if (!Minecraft.getInstance().gui.getDebugOverlay().showDebugScreen()) return;
+            EnvironmentSavedData.refreshFromIntegratedServerIfNeeded(Minecraft.getInstance(), 64, 50000);
+        }
     }
 }

src/main/java/net/xevianlight/aphelion/block/custom/ElectricArcFurnace.java

@@ -25,6 +25,8 @@ import net.minecraft.world.level.block.state.properties.BooleanProperty;
 import net.minecraft.world.level.block.state.properties.DirectionProperty;
 import net.minecraft.world.phys.BlockHitResult;
 import net.neoforged.neoforge.items.ItemStackHandler;
+import net.xevianlight.aphelion.block.custom.base.BasicEntityBlock;
+import net.xevianlight.aphelion.block.custom.base.BasicHorizontalEntityBlock;
 import net.xevianlight.aphelion.block.entity.custom.ElectricArcFurnaceEntity;
 import net.xevianlight.aphelion.core.init.ModBlockEntities;
 import net.xevianlight.aphelion.util.AphelionBlockStateProperties;
@@ -34,14 +36,14 @@ import org.jetbrains.annotations.Nullable;
 import java.util.ArrayList;
 import java.util.List;
 
-public class ElectricArcFurnace extends BaseEntityBlock {
+public class ElectricArcFurnace extends BasicHorizontalEntityBlock {
 
     public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
     public static final BooleanProperty LIT = BlockStateProperties.LIT;
     public static final BooleanProperty FORMED = AphelionBlockStateProperties.FORMED;
 
     public ElectricArcFurnace(Properties properties) {
-        super(properties);
+        super(properties, true);
         this.registerDefaultState(this.getStateDefinition().any()
                 .setValue(FORMED, false));
     }
@@ -164,25 +166,6 @@ public class ElectricArcFurnace extends BaseEntityBlock {
         return 0;
     }
 
-    @Override
-    public @Nullable <T extends BlockEntity> BlockEntityTicker<T> getTicker(Level level, BlockState state, BlockEntityType<T> blockEntityType) {
-        if (level.isClientSide) {
-            return null;
-        }
-        return createTickerHelper(blockEntityType, ModBlockEntities.ELECTRIC_ARC_FURNACE_ENTITY.get(), (level1, blockPos, blockState, electricArcFurnaceEntity) -> electricArcFurnaceEntity.tick(level1, blockPos, blockState));
-
-    }
-
-    @Override
-    protected BlockState rotate(BlockState state, Rotation rotation) {
-        return state.setValue(FACING, rotation.rotate(state.getValue(FACING)));
-    }
-
-    @Override
-    protected BlockState mirror(BlockState state, Mirror mirror) {
-        return state.rotate(mirror.getRotation(state.getValue(FACING)));
-    }
-
     @Override
     public @Nullable BlockState getStateForPlacement(BlockPlaceContext context) {
         return this.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite()).setValue(LIT, false).setValue(FORMED, false);

src/main/java/net/xevianlight/aphelion/block/custom/LaunchPad.java

@@ -0,0 +1,77 @@
+package net.xevianlight.aphelion.block.custom;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.SoundType;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.BooleanProperty;
+import net.xevianlight.aphelion.util.ModTags;
+import org.jetbrains.annotations.NotNull;
+
+public class LaunchPad extends Block {
+
+    public static final BooleanProperty NORTH = BlockStateProperties.NORTH;
+    public static final BooleanProperty EAST  = BlockStateProperties.EAST;
+    public static final BooleanProperty SOUTH = BlockStateProperties.SOUTH;
+    public static final BooleanProperty WEST  = BlockStateProperties.WEST;
+
+    public LaunchPad(Properties properties) {
+        super(properties);
+        this.registerDefaultState(this.stateDefinition.any()
+                .setValue(NORTH, false)
+                .setValue(EAST, false)
+                .setValue(SOUTH, false)
+                .setValue(WEST, false));
+    }
+
+    @Override
+    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
+        builder.add(NORTH, EAST, SOUTH, WEST);
+    }
+
+    private static boolean isPad(BlockState st) {
+        return st.is(ModTags.Blocks.LAUNCH_PAD); // <- make a tag, recommended
+    }
+
+    private BlockState withConnections(LevelAccessor level, BlockPos pos, BlockState state) {
+        return state
+                .setValue(NORTH, isPad(level.getBlockState(pos.north())))
+                .setValue(EAST,  isPad(level.getBlockState(pos.east())))
+                .setValue(SOUTH, isPad(level.getBlockState(pos.south())))
+                .setValue(WEST,  isPad(level.getBlockState(pos.west())));
+    }
+
+    public static Properties getProperties() {
+        return Properties
+                .of()
+                .sound(SoundType.STONE)
+                .destroyTime(2f)
+                .explosionResistance(10f)
+                .requiresCorrectToolForDrops();
+    }
+
+    public static Item.Properties getItemProperties() {
+        return new Item.Properties();
+    }
+
+    @Override
+    public BlockState getStateForPlacement(BlockPlaceContext ctx) {
+        return withConnections(ctx.getLevel(), ctx.getClickedPos(), this.defaultBlockState());
+    }
+
+    @Override
+    public @NotNull BlockState updateShape(@NotNull BlockState state, Direction dir, @NotNull BlockState neighborState,
+                                           @NotNull LevelAccessor level, @NotNull BlockPos pos, @NotNull BlockPos neighborPos) {
+        if (dir.getAxis().isHorizontal()) {
+            return withConnections(level, pos, state);
+        }
+        return state;
+    }
+
+}

src/main/java/net/xevianlight/aphelion/block/custom/OxygenTestBlock.java

@@ -1,25 +1,53 @@
 package net.xevianlight.aphelion.block.custom;
 
+import com.mojang.serialization.MapCodec;
 import net.minecraft.core.BlockPos;
-import net.minecraft.world.level.block.Block;
-import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.RenderShape;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
+import net.xevianlight.aphelion.block.custom.base.BasicEntityBlock;
 import net.xevianlight.aphelion.block.entity.custom.OxygenTestBlockEntity;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-public class OxygenTestBlock extends Block implements EntityBlock {
+public class OxygenTestBlock extends BasicEntityBlock {
 
     public OxygenTestBlock(Properties properties) {
-        super(properties);
+        super(properties, true);
+    }
+
+    public static final MapCodec<OxygenTestBlock> CODEC = simpleCodec(OxygenTestBlock::new);
+
+    @Override
+    protected @NotNull MapCodec<? extends BaseEntityBlock> codec() {
+        return CODEC;
     }
 
     @Override
-    public @Nullable BlockEntity newBlockEntity(BlockPos blockPos, BlockState blockState) {
+    public @Nullable BlockEntity newBlockEntity(@NotNull BlockPos blockPos, @NotNull BlockState blockState) {
         return new OxygenTestBlockEntity(blockPos, blockState);
     }
 
     public static Properties getProperties() {
         return Properties.of();
     }
+
+    @Override
+    @NotNull
+    public RenderShape getRenderShape(@NotNull BlockState pState) {
+        return RenderShape.MODEL;
+    }
+
+    @Override
+    protected void onRemove(BlockState state, @NotNull Level level, @NotNull BlockPos pos, BlockState newState, boolean movedByPiston) {
+        if (state.getBlock() != newState.getBlock()) {
+            BlockEntity blockEntity= level.getBlockEntity(pos);
+            if (blockEntity instanceof OxygenTestBlockEntity oxygenTestBlockEntity) {
+                oxygenTestBlockEntity.removeEnclosed();
+            }
+        }
+        super.onRemove(state, level, pos, newState, movedByPiston);
+    }
 }

src/main/java/net/xevianlight/aphelion/block/custom/PipeTestBlock.java

@@ -0,0 +1,205 @@
+package net.xevianlight.aphelion.block.custom;
+
+import com.mojang.datafixers.kinds.Const;
+import com.mojang.math.Constants;
+import com.mojang.serialization.MapCodec;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.ItemInteractionResult;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.BlockGetter;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.BooleanProperty;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.Vec3;
+import net.minecraft.world.phys.shapes.BooleanOp;
+import net.minecraft.world.phys.shapes.CollisionContext;
+import net.minecraft.world.phys.shapes.Shapes;
+import net.minecraft.world.phys.shapes.VoxelShape;
+import net.neoforged.neoforge.capabilities.Capabilities;
+import net.xevianlight.aphelion.block.custom.base.BasicEntityBlock;
+import net.xevianlight.aphelion.block.entity.custom.PipeTestBlockEntity;
+import net.xevianlight.aphelion.core.init.ModBlocks;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+// a lot of this is ai slop so take it with a grainlet of salt
+public class PipeTestBlock extends BasicEntityBlock {
+
+    // shortcuts for each directional property because they're pretty verbose
+    // t/f here means is/isn't connected outgoing in that direction
+    public static final BooleanProperty NORTH = BlockStateProperties.NORTH;
+    public static final BooleanProperty SOUTH = BlockStateProperties.SOUTH;
+    public static final BooleanProperty EAST = BlockStateProperties.EAST;
+    public static final BooleanProperty WEST = BlockStateProperties.WEST;
+    public static final BooleanProperty UP = BlockStateProperties.UP;
+    public static final BooleanProperty DOWN = BlockStateProperties.DOWN;
+
+    // Voxel shape pieces to make the actual pipe model
+    private static final VoxelShape CORE = Block.box(6, 6, 6, 10, 10, 10);
+    private static final VoxelShape NORTH_SHAPE = Block.box(6, 6, 0, 10, 10, 6);
+    private static final VoxelShape SOUTH_SHAPE = Block.box(6, 6, 10, 10, 10, 16);
+    private static final VoxelShape EAST_SHAPE = Block.box(10, 6, 6, 16, 10, 10);
+    private static final VoxelShape WEST_SHAPE = Block.box(0, 6, 6, 6, 10, 10);
+    private static final VoxelShape UP_SHAPE = Block.box(6, 10, 6, 10, 16, 10);
+    private static final VoxelShape DOWN_SHAPE = Block.box(6, 0, 6, 10, 6, 10);
+
+    // Assembles the "VoxelShape" of the block which i assume is just the collision/place/mine hitbox
+    // later this should be cached for each different shape that we need
+    @Override
+    public VoxelShape getShape(BlockState state, BlockGetter world, BlockPos pos, CollisionContext context) {
+        VoxelShape shape = CORE;
+
+        if (state.getValue(NORTH)) shape = Shapes.join(shape, NORTH_SHAPE, BooleanOp.OR);
+        if (state.getValue(SOUTH)) shape = Shapes.join(shape, SOUTH_SHAPE, BooleanOp.OR);
+        if (state.getValue(EAST))  shape = Shapes.join(shape, EAST_SHAPE, BooleanOp.OR);
+        if (state.getValue(WEST))  shape = Shapes.join(shape, WEST_SHAPE, BooleanOp.OR);
+        if (state.getValue(UP))    shape = Shapes.join(shape, UP_SHAPE, BooleanOp.OR);
+        if (state.getValue(DOWN))  shape = Shapes.join(shape, DOWN_SHAPE, BooleanOp.OR);
+
+        return shape;
+    }
+
+    public PipeTestBlock(Properties properties) {
+        super(properties, true);
+        this.registerDefaultState(this.stateDefinition.any()
+                .setValue(NORTH, false).setValue(SOUTH, false)
+                .setValue(EAST, false).setValue(WEST, false)
+                .setValue(UP, false).setValue(DOWN, false));
+    }
+
+    @Override
+    protected MapCodec<? extends BaseEntityBlock> codec() {
+        return null;
+    }
+
+    // This method determines the state; called when first placed
+    @Override
+    public BlockState getStateForPlacement(BlockPlaceContext context) {
+        return makeConnections(context.getLevel(), context.getClickedPos());
+    }
+
+    // Updates the block; called when a neighbor changes
+    @Override
+    public BlockState updateShape(BlockState state, Direction direction, BlockState neighborState, LevelAccessor level, BlockPos currentPos, BlockPos neighborPos) {
+        return makeConnections(level, currentPos);
+    }
+
+    public static Properties getProperties() {
+        return Properties.of().noOcclusion();
+    }
+
+    private boolean hasAttachment(@Nullable PipeTestBlockEntity BE, Direction direction) {
+        return (BE != null && BE.hasAttachment(direction));
+    }
+
+    private BlockState makeConnections(LevelAccessor level, BlockPos pos) {
+        BlockEntity BE = level.getBlockEntity(pos);
+        PipeTestBlockEntity PTBE = null;
+        if (BE instanceof PipeTestBlockEntity found) {
+            PTBE = found;
+        }
+
+        return this.defaultBlockState()
+                .setValue(NORTH, canConnect(level, pos.north(), Direction.SOUTH) || hasAttachment(PTBE, Direction.NORTH))
+                .setValue(SOUTH, canConnect(level, pos.south(), Direction.NORTH) || hasAttachment(PTBE, Direction.SOUTH))
+                .setValue(EAST, canConnect(level, pos.east(), Direction.WEST) || hasAttachment(PTBE, Direction.EAST))
+                .setValue(WEST, canConnect(level, pos.west(), Direction.EAST) || hasAttachment(PTBE, Direction.WEST))
+                .setValue(UP, canConnect(level, pos.above(), Direction.DOWN) || hasAttachment(PTBE, Direction.UP))
+                .setValue(DOWN, canConnect(level, pos.below(), Direction.UP) || hasAttachment(PTBE, Direction.DOWN));
+    }
+
+    /// If a PipeTestBlock can connect to this position from the given direction.
+    /// If you're going to the NORTH of yourself, you should be accessing the SOUTH side.
+    public static boolean canConnect(LevelAccessor levelA, BlockPos neighborPos, Direction accessSide) {
+        // Methinks this is not the best way to test this.
+        boolean isPipe = levelA.getBlockState(neighborPos).is(ModBlocks.PIPE_TEST_BLOCK.get());
+
+        /// This code is AI, but I think it works? I think the reason it's a levelAccessor instead of a level
+        /// is that we're not sure if we're in, for example, an inventory slot or not.
+        /// Either way, this should only trigger when it makes sense (assuming this is correct in the first place)
+        boolean isInventory;
+        if (levelA instanceof Level level) {
+            isInventory = level.getCapability(Capabilities.ItemHandler.BLOCK, neighborPos, accessSide) != null;
+        } else {
+            isInventory = false;
+        }
+
+        return isPipe || isInventory;
+    }
+
+
+    @Override
+    public void onRemove(BlockState state, Level level, BlockPos pos, BlockState newState, boolean isMoving) {
+        BlockEntity BE = level.getBlockEntity(pos);
+        if (BE instanceof PipeTestBlockEntity pipe) {
+            // force everything connected to this pipe to reevaluate
+            if (pipe.graph != null) pipe.graph.invalidate();
+        }
+        super.onRemove(state, level, pos, newState, isMoving);
+    }
+
+    @Override
+    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
+        builder.add(NORTH, SOUTH, EAST, WEST, UP, DOWN);
+    }
+
+    @Override
+    protected ItemInteractionResult useItemOn(ItemStack stack, BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hitResult) {
+
+        BlockEntity BE = level.getBlockEntity(pos);
+        if (BE instanceof PipeTestBlockEntity PTBE) {
+            ItemInteractionResult r = PTBE.useItemOn(stack, state, level, pos, player, hand, hitResult, this);
+
+            BlockState newState = makeConnections(level, pos);
+            level.setBlock(pos, newState, 3);
+
+            return r;
+        } else {
+            return super.useItemOn(stack, state, level, pos, player, hand, hitResult);
+        }
+    }
+
+    // Doesn't block sunlight
+//    @Override
+//    public boolean propagatesSkylightDown(BlockState state, BlockGetter reader, BlockPos pos) {
+//        return true;
+//    }
+
+    /// This function doesn't do what the AI says it does. I have no idea what it actually does, though
+    // 2. Prevents the "black shadows" inside or around the pipe
+//    @Override
+//    public int getLightBlock(BlockState state, BlockGetter worldIn, BlockPos pos) {
+//        return 0;
+//    }
+
+    /// I don't know what this does, because Properties.noOcclusion() is the part that made the leaves keep
+    /// rendering their faces.
+    // 3. Tells adjacent blocks (like leaves) to keep rendering their faces
+//    @Override
+//    public boolean isOcclusionShapeFullBlock(BlockState state, BlockGetter worldIn, BlockPos pos) {
+//        return false;
+//    }
+
+    // This bit affects how strong the ambient occlusion effect is
+    @Override
+    public float getShadeBrightness(BlockState state, BlockGetter world, BlockPos pos) {
+        return 1.0F; // Maintains full brightness
+    }
+
+    @Override
+    public @Nullable BlockEntity newBlockEntity(@NotNull BlockPos blockPos, @NotNull BlockState blockState) {
+        return new PipeTestBlockEntity(blockPos, blockState);
+    }
+}

src/main/java/net/xevianlight/aphelion/block/custom/RocketAssemblerBlock.java

@@ -0,0 +1,56 @@
+package net.xevianlight.aphelion.block.custom;
+
+import com.mojang.serialization.MapCodec;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.block.*;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BooleanProperty;
+import net.xevianlight.aphelion.block.custom.base.BasicHorizontalEntityBlock;
+import net.xevianlight.aphelion.block.entity.custom.RocketAssemblerBlockEntity;
+import net.xevianlight.aphelion.util.AphelionBlockStateProperties;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class RocketAssemblerBlock extends BasicHorizontalEntityBlock {
+
+    public static final BooleanProperty FORMED = AphelionBlockStateProperties.FORMED;
+
+    public RocketAssemblerBlock(Properties properties) {
+        super(properties, true);
+    }
+
+    public static final MapCodec<RocketAssemblerBlock> CODEC = simpleCodec(RocketAssemblerBlock::new);
+
+    @Override
+    protected @NotNull MapCodec<? extends BaseEntityBlock> codec() {
+        return CODEC;
+    }
+
+    public static Properties getProperties() {
+        return Properties
+                .of()
+                .sound(SoundType.METAL)
+                .destroyTime(2f)
+                .explosionResistance(10f)
+                .requiresCorrectToolForDrops();
+    }
+
+    @Override
+    public @Nullable BlockEntity newBlockEntity(@NotNull BlockPos blockPos, @NotNull BlockState blockState) {
+        return new RocketAssemblerBlockEntity(blockPos, blockState);
+    }
+
+    @Override
+    public @Nullable BlockState getStateForPlacement(BlockPlaceContext context) {
+        return this.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite()).setValue(FORMED, false);
+    }
+
+    @Override
+    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
+        builder.add(FORMED);
+        super.createBlockStateDefinition(builder);
+    }
+}

src/main/java/net/xevianlight/aphelion/block/custom/VacuumArcFurnaceController.java

@@ -14,10 +14,10 @@ import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.context.BlockPlaceContext;
 import net.minecraft.world.level.BlockGetter;
 import net.minecraft.world.level.Level;
-import net.minecraft.world.level.block.*;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.SoundType;
 import net.minecraft.world.level.block.entity.BlockEntity;
-import net.minecraft.world.level.block.entity.BlockEntityTicker;
-import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.state.StateDefinition;
 import net.minecraft.world.level.block.state.properties.BlockStateProperties;
@@ -25,25 +25,25 @@ import net.minecraft.world.level.block.state.properties.BooleanProperty;
 import net.minecraft.world.level.block.state.properties.DirectionProperty;
 import net.minecraft.world.phys.BlockHitResult;
 import net.neoforged.neoforge.items.ItemStackHandler;
-import net.xevianlight.aphelion.block.entity.custom.ElectricArcFurnaceEntity;
+import net.xevianlight.aphelion.block.custom.base.BasicHorizontalEntityBlock;
 import net.xevianlight.aphelion.block.entity.custom.VacuumArcFurnaceControllerEntity;
-import net.xevianlight.aphelion.core.init.ModBlockEntities;
 import net.xevianlight.aphelion.util.AphelionBlockStateProperties;
 import net.xevianlight.aphelion.util.IMultiblockController;
 import net.xevianlight.aphelion.util.MultiblockHelper;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class VacuumArcFurnaceController extends BaseEntityBlock {
+public class VacuumArcFurnaceController extends BasicHorizontalEntityBlock {
 
     public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
     public static final BooleanProperty LIT = BlockStateProperties.LIT;
     public static final BooleanProperty FORMED = AphelionBlockStateProperties.FORMED;
 
     public VacuumArcFurnaceController(Properties properties) {
-        super(properties);
+        super(properties, true);
         this.registerDefaultState(this.getStateDefinition().any()
                 .setValue(FACING, Direction.NORTH)
                 .setValue(LIT, false)
@@ -77,7 +77,7 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
     }
 
     @Override
-    public InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos, Player player, BlockHitResult result) {
+    public @NotNull InteractionResult useWithoutItem(@NotNull BlockState state, Level level, @NotNull BlockPos pos, @NotNull Player player, @NotNull BlockHitResult result) {
         if (!level.isClientSide && player instanceof ServerPlayer serverPlayer && level.getBlockEntity(pos) instanceof VacuumArcFurnaceControllerEntity vacuumArcFurnaceEntity) {
             if (vacuumArcFurnaceEntity.isFormed())
                 serverPlayer.openMenu(new SimpleMenuProvider(vacuumArcFurnaceEntity, Component.literal("Vacuum Arc Furnace")), pos);
@@ -88,21 +88,16 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
 
 
     @Override
-    public @Nullable BlockEntity newBlockEntity(BlockPos blockPos, BlockState blockState) {
+    public @Nullable BlockEntity newBlockEntity(@NotNull BlockPos blockPos, @NotNull BlockState blockState) {
         return new VacuumArcFurnaceControllerEntity(blockPos, blockState);
     }
 
     @Override
-    public RenderShape getRenderShape(BlockState pState) {
-        return RenderShape.MODEL;
-    }
-
-    @Override
-    protected void onRemove(BlockState state, Level level, BlockPos pos, BlockState newState, boolean movedByPiston) {
+    protected void onRemove(BlockState state, Level level, @NotNull BlockPos pos, BlockState newState, boolean movedByPiston) {
         if (!level.isClientSide && state.getBlock() != newState.getBlock()) {
             BlockEntity blockEntity= level.getBlockEntity(pos);
             if (blockEntity instanceof VacuumArcFurnaceControllerEntity vacuumArcFurnaceEntity) {
-                if(state.getValue(FORMED)) MultiblockHelper.unformForRemoval(level, state, pos, vacuumArcFurnaceEntity.SHAPE, AphelionBlockStateProperties.FORMED);
+                if(state.getValue(FORMED)) MultiblockHelper.unformForRemoval(level, state, pos, VacuumArcFurnaceControllerEntity.SHAPE, AphelionBlockStateProperties.FORMED);
                 vacuumArcFurnaceEntity.drops();
             }
         }
@@ -110,7 +105,7 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
     }
 
     @Override
-    protected void onPlace(BlockState state, Level level, BlockPos pos, BlockState oldState, boolean movedByPiston) {
+    protected void onPlace(BlockState state, Level level, @NotNull BlockPos pos, @NotNull BlockState oldState, boolean movedByPiston) {
         super.onPlace(state, level, pos, oldState, movedByPiston);
         if (!level.isClientSide() && oldState.getBlock() != state.getBlock()) {
             BlockEntity blockEntity= level.getBlockEntity(pos);
@@ -120,7 +115,7 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
         }
     }
 
-    public static int getRedstoneSignalFromItemHandler(@javax.annotation.Nullable ItemStackHandler itemStackHandler, List<Integer> slots) {
+    public static int getRedstoneSignalFromItemHandler(@Nullable ItemStackHandler itemStackHandler, List<Integer> slots) {
         if (itemStackHandler == null) {
             return 0;
         } else {
@@ -141,22 +136,22 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
     }
 
     @Override
-    protected boolean isSignalSource(BlockState state) {
+    protected boolean isSignalSource(@NotNull BlockState state) {
         return true;
     }
 
     @Override
-    protected int getSignal(BlockState state, BlockGetter level, BlockPos pos, Direction direction) {
+    protected int getSignal(@NotNull BlockState state, @NotNull BlockGetter level, @NotNull BlockPos pos, @NotNull Direction direction) {
         return super.getSignal(state, level, pos, direction);
     }
 
     @Override
-    protected boolean hasAnalogOutputSignal(BlockState state) {
+    protected boolean hasAnalogOutputSignal(@NotNull BlockState state) {
         return true;
     }
 
     @Override
-    protected int getAnalogOutputSignal(BlockState blockState, Level level, BlockPos pos) {
+    protected int getAnalogOutputSignal(@NotNull BlockState blockState, Level level, @NotNull BlockPos pos) {
         List<Integer> slots = new ArrayList<>();
         slots.add(VacuumArcFurnaceControllerEntity.INPUT_SLOT);
         slots.add(VacuumArcFurnaceControllerEntity.SECONDARY_INPUT_SLOT);
@@ -169,25 +164,6 @@ public class VacuumArcFurnaceController extends BaseEntityBlock {
         return 0;
     }
 
-    @Override
-    public @Nullable <T extends BlockEntity> BlockEntityTicker<T> getTicker(Level level, BlockState state, BlockEntityType<T> blockEntityType) {
-        if (level.isClientSide) {
-            return null;
-        }
-        return createTickerHelper(blockEntityType, ModBlockEntities.VACUUM_ARC_FURNACE_ENTITY.get(), (level1, blockPos, blockState, vacuumArcFurnaceEntity) -> vacuumArcFurnaceEntity.tick(level1, blockPos, blockState));
-
-    }
-
-    @Override
-    protected BlockState rotate(BlockState state, Rotation rotation) {
-        return state.setValue(FACING, rotation.rotate(state.getValue(FACING)));
-    }
-
-    @Override
-    protected BlockState mirror(BlockState state, Mirror mirror) {
-        return state.rotate(mirror.getRotation(state.getValue(FACING)));
-    }
-
     @Override
     public @Nullable BlockState getStateForPlacement(BlockPlaceContext context) {
         return this.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite()).setValue(LIT, false).setValue(FORMED, false);

src/main/java/net/xevianlight/aphelion/block/custom/base/BasicEntityBlock.java

@@ -0,0 +1,61 @@
+package net.xevianlight.aphelion.block.custom.base;
+
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.BaseEntityBlock;
+import net.minecraft.world.level.block.RenderShape;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.BlockEntityTicker;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+import net.minecraft.world.level.block.state.BlockState;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public abstract class BasicEntityBlock extends BaseEntityBlock {
+
+    private final boolean shouldTick;
+    private BlockEntityType<?> entity;
+
+    protected BasicEntityBlock(Properties properties, boolean shouldTick) {
+        super(properties);
+        this.shouldTick = shouldTick;
+    }
+
+    @Override
+    protected @NotNull RenderShape getRenderShape(@NotNull BlockState state) {
+        return RenderShape.MODEL;
+    }
+
+    public static Item.Properties getItemProperties() {
+        return new Item.Properties();
+    }
+
+    @Override
+    public @Nullable <T extends BlockEntity> BlockEntityTicker<T> getTicker(@NotNull Level level, @NotNull BlockState state, @NotNull BlockEntityType<T> blockEntityType) {
+        return !shouldTick ? null : (entityLevel, pos, blockState, blockEntity) -> {
+            if (blockEntity instanceof TickableBlockEntity tickable) {
+                long time = level.getGameTime() - pos.hashCode();
+                tickable.tick(entityLevel, time, blockState, pos);
+                if (level.isClientSide()) {
+                    tickable.clientTick((ClientLevel) level, time, state, pos);
+                } else {
+                    tickable.serverTick((ServerLevel) level, time, state, pos);
+                }
+                if (!tickable.isInitialized()) tickable.firstTick(level, state, pos);
+            }
+        };
+    }
+
+    @Override
+    protected void onRemove(BlockState state, @NotNull Level level, @NotNull BlockPos pos, BlockState newState, boolean movedByPiston) {
+        if (state.getBlock() != newState.getBlock()) {
+            if (level.getBlockEntity(pos) instanceof TickableBlockEntity tickable) {
+                tickable.onRemoved();
+            }
+        }
+        super.onRemove(state, level, pos, newState, movedByPiston);
+    }
+}

src/main/java/net/xevianlight/aphelion/block/custom/base/BasicHorizontalEntityBlock.java

@@ -0,0 +1,42 @@
+package net.xevianlight.aphelion.block.custom.base;
+
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Mirror;
+import net.minecraft.world.level.block.Rotation;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.DirectionProperty;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public abstract class BasicHorizontalEntityBlock extends BasicEntityBlock {
+
+    protected BasicHorizontalEntityBlock(Properties properties, boolean shouldTick) {
+        super(properties, shouldTick);
+        this.registerDefaultState(this.getStateDefinition().any());
+    }
+
+    public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
+
+    @Override
+    protected @NotNull BlockState rotate(BlockState state, Rotation rotation) {
+        return state.setValue(FACING, rotation.rotate(state.getValue(FACING)));
+    }
+
+    @Override
+    protected @NotNull BlockState mirror(BlockState state, Mirror mirror) {
+        return state.rotate(mirror.getRotation(state.getValue(FACING)));
+    }
+
+    @Override
+    public @Nullable BlockState getStateForPlacement(BlockPlaceContext context) {
+        return this.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());
+    }
+
+    @Override
+    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
+        builder.add(FACING);
+    }
+}

src/main/java/net/xevianlight/aphelion/block/custom/base/TickableBlockEntity.java

@@ -0,0 +1,51 @@
+package net.xevianlight.aphelion.block.custom.base;
+
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.state.BlockState;
+
+public interface TickableBlockEntity {
+
+    /**
+     * Runs on both the client AND server.
+     * @param level
+     * @param time
+     * @param state
+     * @param pos
+     */
+    default void tick (Level level, long time, BlockState state, BlockPos pos) {};
+
+    /**
+     * Runs on the client only
+     * @param level
+     * @param time
+     * @param state
+     * @param pos
+     */
+    void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos);
+
+    /**
+     * Runs on the server only
+     * @param level
+     * @param time
+     * @param state
+     * @param pos
+     */
+    void serverTick(ServerLevel level, long time, BlockState state, BlockPos pos);
+
+    default boolean isInitialized() {
+        return true;
+    };
+
+    /**
+     * Runs on client AND server, once only.
+     * @param level
+     * @param state
+     * @param pos
+     */
+    void firstTick(Level level, BlockState state, BlockPos pos);
+
+    default void onRemoved() {}
+}

src/main/java/net/xevianlight/aphelion/block/dummy/entity/BaseMultiblockDummyBlockEntity.java

@@ -142,7 +142,7 @@ public class BaseMultiblockDummyBlockEntity extends BlockEntity implements IMult
         // Force rerender on client
         if (level != null) {
             level.sendBlockUpdated(worldPosition, getBlockState(), getBlockState(), 3);
-            requestModelDataUpdate(); // if you rely on model data
+            requestModelDataUpdate(); // if you rely on model partitionData
         }
     }
 
@@ -179,7 +179,7 @@ public class BaseMultiblockDummyBlockEntity extends BlockEntity implements IMult
         setChanged();
         if (level != null) {
             level.sendBlockUpdated(worldPosition, getBlockState(), getBlockState(), 3);
-            requestModelDataUpdate(); // only if you use model data
+            requestModelDataUpdate(); // only if you use model partitionData
         }
     }
 }

src/main/java/net/xevianlight/aphelion/block/entity/custom/ElectricArcFurnaceEntity.java

@@ -1,5 +1,6 @@
 package net.xevianlight.aphelion.block.entity.custom;
 
+import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.core.HolderLookup;
@@ -8,6 +9,7 @@ import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.Packet;
 import net.minecraft.network.protocol.game.ClientGamePacketListener;
 import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.Containers;
 import net.minecraft.world.MenuProvider;
 import net.minecraft.world.SimpleContainer;
@@ -25,6 +27,7 @@ import net.neoforged.neoforge.energy.IEnergyStorage;
 import net.neoforged.neoforge.items.IItemHandler;
 import net.neoforged.neoforge.items.ItemStackHandler;
 import net.xevianlight.aphelion.block.custom.ElectricArcFurnace;
+import net.xevianlight.aphelion.block.custom.base.TickableBlockEntity;
 import net.xevianlight.aphelion.block.entity.energy.ModEnergyStorage;
 import net.xevianlight.aphelion.core.init.ModBlockEntities;
 import net.xevianlight.aphelion.core.init.ModBlocks;
@@ -39,7 +42,7 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
 
-public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvider {
+public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvider, TickableBlockEntity {
 
     private final int SIZE = 4;
     private int ENERGY_CAPACITY = 64000;
@@ -101,10 +104,8 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
 //        }
     };
 
-    public void tick(Level level, BlockPos pos, BlockState blockState) {
-
-        if (!blockState.getValue(AphelionBlockStateProperties.FORMED))
-            return;
+    @Override
+    public void serverTick(ServerLevel level, long time, BlockState state, BlockPos pos) {
 
         chargeFromItem();
 
@@ -114,8 +115,8 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
                 // Recipe detected! We have enough energy to process
                 progress++;
                 useEnergy();
-                level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, true));
-                setChanged(level, pos, blockState);
+                level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, true));
+                setChanged(level, pos, state);
 
                 if (hasCraftingFinished()) {
                     outputBlastingResult(INPUT_SLOT, OUTPUT_SLOT);
@@ -123,14 +124,14 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
                 }
             } else if (hasFurnaceRecipe(INPUT_SLOT) && !hasEnoughEnergyToCraft(MACHINE_ENERGY_COST)) {
                 // Recipe detected but we ran out of power
-                level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, false));
-                setChanged(level, pos, blockState);
+                level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, false));
+                setChanged(level, pos, state);
                 progress = progress > 0 ? progress - 1 : 0;
             } else {
                 // Invalid recipe
                 resetProgress();
-                level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, false));
-                setChanged(level, pos, blockState);
+                level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, false));
+                setChanged(level, pos, state);
             }
         } else {
             // Secondary slot is NOT empty, try alloying recipes
@@ -139,8 +140,8 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
                     // Alloy recipe detected! We have enough energy to process
                     progress++;
                     useEnergy();
-                    level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, true));
-                    setChanged(level, pos, blockState);
+                    level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, true));
+                    setChanged(level, pos, state);
 
                     if (hasCraftingFinished()) {
                         outputAlloyingResult(INPUT_SLOT, SECONDARY_INPUT_SLOT, OUTPUT_SLOT);
@@ -148,19 +149,17 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
                     }
                 } else {
                     // Recipe detected but we ran out of power
-                    level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, false));
-                    setChanged(level, pos, blockState);
+                    level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, false));
+                    setChanged(level, pos, state);
                     progress = progress > 0 ? progress - 1 : 0;
                 }
             } else {
                 // Invalid recipe
                 resetProgress();
-                level.setBlockAndUpdate(pos, blockState.setValue(ElectricArcFurnace.LIT, false));
-                setChanged(level, pos, blockState);
+                level.setBlockAndUpdate(pos, state.setValue(ElectricArcFurnace.LIT, false));
+                setChanged(level, pos, state);
             }
         }
-
-
     }
 
     private void chargeFromItem() {
@@ -408,4 +407,14 @@ public class ElectricArcFurnaceEntity extends BlockEntity implements MenuProvide
         new MultiblockHelper.ShapePart(new BlockPos(3,0,3), s -> s.is(ModBlocks.ARC_FURNACE_CASING_BLOCK)),
 //        new MultiblockHelper.ShapePart(new BlockPos(-1,0,0), s -> s.is(Blocks.AMETHYST_BLOCK))
     };
+
+    @Override
+    public void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos) {
+
+    }
+
+    @Override
+    public void firstTick(Level level, BlockState state, BlockPos pos) {
+
+    }
 }

src/main/java/net/xevianlight/aphelion/block/entity/custom/OxygenTestBlockEntity.java

@@ -1,29 +1,38 @@
 package net.xevianlight.aphelion.block.entity.custom;
 
-import it.unimi.dsi.fastutil.longs.Long2ObjectArrayMap;
 import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.core.BlockPos;
-import net.minecraft.core.Direction;
-import net.minecraft.core.SectionPos;
-import net.minecraft.core.Vec3i;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import static net.xevianlight.aphelion.Aphelion.LOGGER;
 
-import net.minecraft.world.level.chunk.ChunkAccess;
 import net.minecraft.world.level.chunk.LevelChunk;
+import net.xevianlight.aphelion.block.custom.base.TickableBlockEntity;
 import net.xevianlight.aphelion.core.init.ModBlockEntities;
+import net.xevianlight.aphelion.core.saveddata.EnvironmentSavedData;
+import net.xevianlight.aphelion.util.FloodFill3D;
 import org.openjdk.nashorn.internal.runtime.regexp.joni.exception.ValueException;
 
 import java.util.*;
 
-public class OxygenTestBlockEntity extends BlockEntity {
+public class OxygenTestBlockEntity extends BlockEntity implements TickableBlockEntity {
 
 
     public OxygenTestBlockEntity(BlockPos pos, BlockState blockState) {
         super(ModBlockEntities.OXYGEN_TEST_BLOCK_ENTITY.get(), pos, blockState);
     }
 
+    public boolean isInitialized;
+
+    @Override
+    public boolean isInitialized() {
+        return this.isInitialized;
+    }
+
     private LevelChunk lastChunk;
     private int lastChunkX = Integer.MIN_VALUE, lastChunkZ = Integer.MIN_VALUE;
 
@@ -43,11 +52,25 @@ public class OxygenTestBlockEntity extends BlockEntity {
         return level != null && fastBlockState(pos).isAir();
     }
 
-    public static final int MAX_RANGE = 100;
+    public static final int MAX_RANGE = 16;
     public boolean isInRange(BlockPos pos1, BlockPos pos2) {
         return Math.abs(pos1.getX() - pos2.getX()) + Math.abs(pos1.getY() - pos2.getY()) + Math.abs(pos1.getZ() - pos2.getZ()) <= MAX_RANGE;
     }
 
+    public void removeEnclosed() {
+        if (enclosedCache != null) {
+            var singleplayerServer = Minecraft.getInstance().getSingleplayerServer();
+            if (singleplayerServer != null) {
+                var serverLevel = singleplayerServer.getLevel(level.dimension());
+                if (serverLevel != null) {
+                    var savedData = EnvironmentSavedData.get(serverLevel);
+                    savedData.resetOxygen(serverLevel, enclosedCache);
+                    enclosedCache = Set.of();
+                }
+            }
+        }
+    }
+
     /// 256*256*256 grid of booleans
     private class BigBoolGrid {
         int bitsSize;
@@ -94,7 +117,7 @@ public class OxygenTestBlockEntity extends BlockEntity {
             // wrapping order is X->Z->Y, so we go along the X axis,
             // wrap to the Z axis to make a square, and once the square is full
             // we step up once along the Y axis.
-            int bitPos = inX & 7; // bottom 4 bits of X is bit pos
+            int bitPos = inX & 15; // bottom 4 bits of X is bit pos
             int bit = (1 << bitPos);
 
             // First (bitsSize-4) bits are for X, next (bitsSize) bits are for Z, next (bitsSize) bits are for Y
@@ -106,22 +129,29 @@ public class OxygenTestBlockEntity extends BlockEntity {
         }
     }
 
-    private List<BlockPos> enclosedCache;
-    public List<BlockPos> getEnclosedBlocks() {
-        if (level == null) return List.of();
-        if (enclosedCache != null) return enclosedCache;
+    private Set<BlockPos> enclosedCache;
+
+
+    public Set<BlockPos> getEnclosedCache() {
+        return enclosedCache;
+    }
+
+    public Set<BlockPos> getEnclosedBlocks() {
+        if (level == null) return Set.of();
+//        if (enclosedCache != null) return enclosedCache;
 
         long start = System.nanoTime();
-        List<BlockPos> enclosedBlocks = new ArrayList<>();
-        // make this bitch BIIIIIG
-        BigBoolGrid seen = new BigBoolGrid(8, this.getBlockPos().getX(), this.getBlockPos().getY(), this.getBlockPos().getZ());
+        Set<BlockPos> enclosedBlocks = FloodFill3D.run(level, getBlockPos(), 6000, FloodFill3D.TEST_FULL_SEAL, true);
 
-        // It's... a reasonable assumption that we won't have to include more blocks at once than the area of a sphere?
-        // maybe a bit more, IDK how exactly it scales to blocks.
-        Stack<BlockPos> stack = new Stack<>();
-        Stack<Integer> radiusStack = new Stack<>();
-
-        stack.add(this.getBlockPos());
+//        // make this bitch BIIIIIG
+//        BigBoolGrid seen = new BigBoolGrid(8, this.getBlockPos().getX(), this.getBlockPos().getY(), this.getBlockPos().getZ());
+//
+//        // It's... a reasonable assumption that we won't have to include more blocks at once than the area of a sphere?
+//        // maybe a bit more, IDK how exactly it scales to blocks.
+//        Stack<BlockPos> stack = new Stack<>();
+//        Stack<Integer> radiusStack = new Stack<>();
+//
+//        stack.add(this.getBlockPos());
 
         // Do flood fill out from this block
         // Push on the top of the stack (newest), pop from the bottom of the stack (oldest).
@@ -130,21 +160,48 @@ public class OxygenTestBlockEntity extends BlockEntity {
         // and you'd see that every pos of layer 1 is together, then layer 2, then layer 3...
 
 
-        BlockPos ourPos = getBlockPos();
-        while (!stack.isEmpty()) {
-            BlockPos spreadFromPos = stack.pop();
-            for (Direction d : Direction.values()) {
-                BlockPos relativePos = spreadFromPos.relative(d);
+//        BlockPos ourPos = getBlockPos();
+//        while (!stack.isEmpty()) {
+//            BlockPos spreadFromPos = stack.pop();
+//            for (Direction d : Direction.values()) {
+//                BlockPos relativePos = spreadFromPos.relative(d);
+//
+//                if (isInRange(relativePos, ourPos) && canSpreadTo(relativePos)) {
+//                    // seen.add runs seen.contains under the hood,
+//                    // + this is the most expensive operation.
+//                    // should save a lot of time!
+//                    if (seen.add(relativePos.getX(), relativePos.getY(), relativePos.getZ())) {
+//                        enclosedBlocks.add(relativePos);
+//                        stack.add(relativePos);
+//                    }
+//                }
+//            }
+//        }
 
-                if (isInRange(relativePos, ourPos) && canSpreadTo(relativePos)) {
-                    // seen.add runs seen.contains under the hood,
-                    // + this is the most expensive operation.
-                    // should save a lot of time!
-                    if (seen.add(relativePos.getX(), relativePos.getY(), relativePos.getZ())) {
-                        enclosedBlocks.add(relativePos);
-                        stack.add(relativePos);
+        var singleplayerServer = Minecraft.getInstance().getSingleplayerServer();
+        if (singleplayerServer != null) {
+            var serverLevel = singleplayerServer.getLevel(level.dimension());
+            if (serverLevel != null) {
+
+                // Build a set of longs for the newly computed blocks (order-independent)
+                boolean changed = isChanged(enclosedBlocks);
+//                boolean changed = false;
+                if (changed) {
+                    var savedData = EnvironmentSavedData.get(serverLevel);
+
+                    // Revert old affected area back to defaults
+                    if (enclosedCache != null) {
+                        savedData.resetOxygen(serverLevel, enclosedCache);
                     }
+
+                    // Apply oxygen to new affected area
+                    savedData.setOxygen(serverLevel, enclosedBlocks, true);
+
+                    LOGGER.info("Saved data for {} blocks to leveldata", enclosedBlocks.size());
                 }
+
+                // Update the cache no matter what (so next compare is correct)
+                enclosedCache = enclosedBlocks;
             }
         }
         long durationNanos = System.nanoTime() - start;
@@ -152,12 +209,62 @@ public class OxygenTestBlockEntity extends BlockEntity {
         LOGGER.info("Flood fill completed in {}µs, {} blocks at {}µs/block", durationMicros, enclosedBlocks.size(), durationMicros / enclosedBlocks.size());
 
         enclosedCache = enclosedBlocks;
-        return enclosedBlocks;
+
+        return enclosedCache;
+    }
+
+    private boolean isChanged(Set<BlockPos> enclosedBlocks) {
+        LongOpenHashSet newSet = new LongOpenHashSet(enclosedBlocks.size());
+        for (BlockPos p : enclosedBlocks) {
+            newSet.add(p.asLong());
+        }
+
+        // Build a set of longs for the cached blocks (if any)
+        LongOpenHashSet oldSet = null;
+        if (enclosedCache != null) {
+            oldSet = new LongOpenHashSet(enclosedCache.size());
+            for (BlockPos p : enclosedCache) {
+                oldSet.add(p.asLong());
+            }
+        }
+
+        // Only save if the set of affected blocks has changed
+        boolean changed = (oldSet == null) || !oldSet.equals(newSet);
+        return changed;
     }
 
     private void helper() {
         var myVar = new BlockPos(1, 1, 1).hashCode();
     }
 
+    int ticks = 0;
+    int refreshAfter = 20;
 
+
+    @Override
+    public void serverTick(ServerLevel level, long time, BlockState blockState, BlockPos pos) {
+        ticks++;
+        if (ticks >= refreshAfter) {
+            getEnclosedBlocks();
+            ticks = 0;
+
+            // UNCOMMENT FOR DEBUG ONLY!!! EXTREMELY TPS INTENSIVE!!!
+//            EnvironmentSavedData.refreshFromIntegratedServerIfNeeded(Minecraft.getInstance(), 64, 10000);
+        }
+    }
+
+    @Override
+    public void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos) {
+
+    }
+
+    @Override
+    public void tick(Level entityLevel, long time, BlockState blockState, BlockPos pos) {
+
+    }
+
+    @Override
+    public void firstTick(Level level, BlockState state, BlockPos pos) {
+        this.isInitialized = true;
+    }
 }

src/main/java/net/xevianlight/aphelion/block/entity/custom/PipeTestBlockEntity.java

@@ -0,0 +1,155 @@
+package net.xevianlight.aphelion.block.entity.custom;
+
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.ItemInteractionResult;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.Vec3;
+import net.neoforged.neoforge.capabilities.Capabilities;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.block.custom.PipeTestBlock;
+import net.xevianlight.aphelion.block.custom.base.TickableBlockEntity;
+import net.xevianlight.aphelion.core.init.ModBlockEntities;
+import net.xevianlight.aphelion.core.init.ModBlocks;
+import net.xevianlight.aphelion.systems.conveyor.*;
+import net.xevianlight.aphelion.util.FloodFill3D;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.*;
+
+public class PipeTestBlockEntity extends BlockEntity implements TickableBlockEntity {
+    public @Nullable ConveyorNetwork graph = null;
+    public final Map<Direction, @Nullable ConveyorAttachment> attachments = new HashMap<>();
+    public final Map<Direction, @Nullable ConveyorOutput> outputs = new HashMap<>();
+
+    public PipeTestBlockEntity(BlockPos pos, BlockState blockState) {
+        super(ModBlockEntities.PIPE_TEST_BLOCK_ENTITY.get(), pos, blockState);
+    }
+
+    @Override
+    public void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos) {
+
+    }
+
+    @Override
+    public void serverTick(ServerLevel level, long time, BlockState state, BlockPos pos) {
+        if (this.graph == null) initGraph(level, pos);
+        // TODO: Call this as little as necessary
+        makeOutputs(level, state, pos);
+
+        for (Direction dir : Direction.values()) {
+            ConveyorAttachment attachment = attachments.get(dir);
+            if (attachment != null) {
+                attachment.tick(level, state, pos, dir, graph);
+            }
+        }
+    }
+
+    @Override
+    public void firstTick(Level level, BlockState state, BlockPos pos) {
+
+    }
+
+    private void addOutput(Direction dir, ConveyorOutput output) {
+        outputs.put(dir, output);
+        if (graph != null) graph.outputs.add(output);
+    }
+
+    private void removeOutput(Direction dir) {
+        ConveyorOutput old = outputs.get(dir);
+        if (graph != null) graph.outputs.remove(old);
+        outputs.remove(dir);
+    }
+
+    private boolean canOutputTo(Level level, BlockPos pos, Direction accessSide) {
+        return level.getCapability(Capabilities.ItemHandler.BLOCK, pos, accessSide) != null;
+    }
+
+    protected void makeOutputs(ServerLevel level, BlockState state, BlockPos pos) {
+        BlockPos.MutableBlockPos neighbor = new BlockPos.MutableBlockPos();
+        for (Direction dir : Direction.values()) {
+            neighbor.setWithOffset(pos, dir);
+
+            if (canOutputTo(level, neighbor, dir.getOpposite()) && attachments.get(dir) == null && outputs.get(dir) == null) {
+                addOutput(dir, new BasicItemOutput(level, pos, dir));
+            }
+
+            if (!(canOutputTo(level, neighbor, dir.getOpposite()) && attachments.get(dir) == null) && outputs.get(dir) != null) {
+                removeOutput(dir);
+            }
+        }
+    }
+
+    public boolean hasAttachment(Direction direction) {
+        return attachments.get(direction) != null;
+    }
+
+    // Simplest implementation I can think of
+    public static void initGraph(Level level, BlockPos pos) {
+        Aphelion.LOGGER.info("Init graph from {}", pos);
+        if (!level.getBlockState(pos).is(ModBlocks.PIPE_TEST_BLOCK.get())) return;
+        Set<BlockPos> pipes = FloodFill3D.run(
+                level, pos, 1000,
+                (var v1, var v2, var state, var v4, var v5, var v6) -> state.is(ModBlocks.PIPE_TEST_BLOCK.get()),
+                false);
+
+        Aphelion.LOGGER.info("Got {} pipes", pipes.size());
+        ConveyorNetwork graph = new ConveyorNetwork();
+        for (BlockPos pipePos : pipes) {
+            BlockEntity BE = level.getBlockEntity(pipePos);
+            if (BE instanceof PipeTestBlockEntity pipe) {
+                // Invalidate any old graphs
+                if (pipe.graph != null) {
+                    pipe.graph.invalidate();
+                }
+
+                graph.addPipe(pipe);
+            }
+        }
+    }
+
+    public void setAttachment(Direction side, ConveyorAttachment attachment) {
+        attachments.put(side, attachment);
+    }
+
+    public boolean trySetAttachment(Direction side, ConveyorAttachment attachment) {
+        if (hasAttachment(side)) return false;
+        setAttachment(side, attachment);
+        return true;
+    }
+
+    public static boolean isAttachmentItem(ItemStack stack) {
+        //TODO: add actual attachment items instead of just stone
+        return stack.is(Item.byId(1));
+    }
+
+    // Server only
+    public ConveyorAttachment getAttachmentForItem(ItemStack stack, Direction side) {
+        if (level.isClientSide()) throw new RuntimeException("Cannot get attachment item on client side!");
+        return new BasicItemExtractAttachment((ServerLevel) level, getBlockPos(), side);
+    }
+
+    /// Called from pipe test block's useItemOn
+    public ItemInteractionResult useItemOn(ItemStack stack, BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hitResult, PipeTestBlock block) {
+        if (level.isClientSide) return ItemInteractionResult.SUCCESS;
+        Vec3 relativePos = hitResult.getLocation().subtract(pos.getCenter());
+        Direction pipeSide = Direction.getNearest(relativePos);
+
+        if (isAttachmentItem(stack)) {
+            boolean success = trySetAttachment(pipeSide, getAttachmentForItem(stack, pipeSide));
+
+            return success ? ItemInteractionResult.SUCCESS : ItemInteractionResult.FAIL;
+        } else {
+            return ItemInteractionResult.PASS_TO_DEFAULT_BLOCK_INTERACTION; // goes through with whatever other interaction (placing a block, etc)
+        }
+    }
+}

src/main/java/net/xevianlight/aphelion/block/entity/custom/RocketAssemblerBlockEntity.java

@@ -0,0 +1,299 @@
+package net.xevianlight.aphelion.block.entity.custom;
+
+import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.Connection;
+import net.minecraft.network.protocol.Packet;
+import net.minecraft.network.protocol.game.ClientGamePacketListener;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.block.custom.base.TickableBlockEntity;
+import net.xevianlight.aphelion.core.init.ModBlockEntities;
+import net.xevianlight.aphelion.core.init.ModBlocks;
+import net.xevianlight.aphelion.util.AphelionBlockStateProperties;
+import net.xevianlight.aphelion.util.ModTags;
+import net.xevianlight.aphelion.util.RocketStructure;
+import org.apache.commons.lang3.NotImplementedException;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayDeque;
+
+public class RocketAssemblerBlockEntity extends BlockEntity implements TickableBlockEntity {
+
+    Direction facing;
+    BlockPos padScanStart = BlockPos.ZERO;
+    private PadInfo padBounds;
+
+    public @Nullable PadInfo getPadBounds() {
+        return padBounds;
+    }
+
+    public boolean isInitialized;
+    @Override
+    public boolean isInitialized() {
+        return isInitialized;
+    }
+
+    public RocketAssemblerBlockEntity(BlockPos pos, BlockState blockState) {
+        super(ModBlockEntities.ROCKET_ASSEMBLER_BLOCK_ENTITY.get(), pos, blockState);
+    }
+
+    public record PadInfo(BlockPos min, BlockPos max) {
+        public int getVolume() {
+            int dx = max.getX() - min.getX() + 1;
+            int dy = max.getY() - min.getY() + 1;
+            int dz = max.getZ() - min.getZ() + 1;
+
+            return dx * dy * dz;
+        }
+    }
+
+    private final Block TOWER_BLOCK = ModBlocks.BLOCK_STEEL.get();
+    public BlockPos towerBasePos;
+
+    public @Nullable PadInfo getPlatform() {
+        // TODO
+        int y = this.padScanStart.getY();
+        BlockPos start = this.padScanStart;
+
+        if (level == null) return null;
+        if (!isPad(level.getBlockState(start))) return null;
+
+        int minX = start.getX();
+        while (isPad(level.getBlockState(new BlockPos(minX - 1, y, start.getZ())))) minX--;
+
+        // Find maxX by walking east
+        int maxX = start.getX();
+        while (isPad(level.getBlockState(new BlockPos(maxX + 1, y, start.getZ())))) maxX++;
+
+        // Find minZ by walking north
+        int minZ = start.getZ();
+        while (isPad(level.getBlockState(new BlockPos(start.getX(), y, minZ - 1)))) minZ--;
+
+        // Find maxZ by walking south
+        int maxZ = start.getZ();
+        while (isPad(level.getBlockState(new BlockPos(start.getX(), y, maxZ + 1)))) maxZ++;
+
+        int width  = (maxX - minX) + 1;
+        int length = (maxZ - minZ) + 1;
+
+        // Must be square
+        if (width != length) return null;
+
+        // Verify the entire rectangle is filled with pad blocks
+        for (int x = minX; x <= maxX; x++) {
+            for (int z = minZ; z <= maxZ; z++) {
+                if (!isPad(level.getBlockState(new BlockPos(x, y, z)))) return null;
+            }
+        }
+
+        return new PadInfo(new BlockPos(minX, y, minZ), new BlockPos(maxX, y, maxZ));
+    }
+
+    private boolean connected(BlockState state, Direction dir) {
+        return switch (dir) {
+            case NORTH -> state.getValue(BlockStateProperties.NORTH);
+            case SOUTH -> state.getValue(BlockStateProperties.SOUTH);
+            case EAST -> state.getValue(BlockStateProperties.EAST);
+            case WEST -> state.getValue(BlockStateProperties.WEST);
+            default -> false;
+        };
+    }
+
+    public @Nullable PadInfo getPlatformFill() {
+        if (level == null) return null;
+
+        BlockPos start = this.padScanStart;
+        if (!isPad(level.getBlockState(start))) return null;
+
+
+        final int y = start.getY();
+        int towerHeight = 0;
+
+        ArrayDeque<BlockPos> queue = new ArrayDeque<>();
+        LongOpenHashSet visited = new LongOpenHashSet();
+
+        queue.add(start);
+        visited.add(start.asLong());
+
+        final Direction[] CARDINALS = {Direction.NORTH, Direction.SOUTH, Direction.EAST, Direction.WEST};
+        // When the $#$# are we going to have a rocket larger than 64x64... don't...
+        final int MAX_PAD_BLOCKS = 4096;
+
+        boolean towerFound = false;
+        while (!queue.isEmpty()) {
+            BlockPos p = queue.removeFirst();
+            BlockState s = level.getBlockState(p);
+
+            // We trust block states entirely. If a block state says it has a pad in a direction and is wrong, something else has failed. To minimize level checks and have this run as fast as possible, I won't compare the block
+//            if (!isPad(s)) continue;
+
+            for (Direction d : CARDINALS) {
+                // Only keep going if the block claims to have a neighbor in that direction
+                BlockPos n = p.relative(d);
+
+                if (!connected(s, d)) {
+                    if (level.getBlockState(n).is(TOWER_BLOCK)) {
+                        if (!towerFound) {
+                            towerBasePos = n;
+                            towerFound = true;
+                        } else if (!n.equals(towerBasePos)) {
+                            Aphelion.LOGGER.warn("Multiple towers found, rocket pad invalid");
+                            return null;
+                        }
+                    }
+                    continue;
+                }
+
+                if (visited.contains(n.asLong())) continue; // skip if we've already seen this block
+
+                visited.add(n.asLong());
+                queue.addLast(n);
+
+                if (visited.size() > MAX_PAD_BLOCKS) return null;
+
+            }
+        }
+
+        // Pads missing a tower should be invalid
+        if (!towerFound || towerBasePos == null) return null;
+        towerHeight = getTowerHeight(level, towerBasePos);
+        if (towerHeight <= 0) return null;
+
+        int minX = Integer.MAX_VALUE, maxX = Integer.MIN_VALUE;
+        int minZ = Integer.MAX_VALUE, maxZ = Integer.MIN_VALUE;
+
+        for (Long p : visited) {
+            minX = Math.min(minX, BlockPos.of(p).getX());
+            maxX = Math.max(maxX, BlockPos.of(p).getX());
+            minZ = Math.min(minZ, BlockPos.of(p).getZ());
+            maxZ = Math.max(maxZ, BlockPos.of(p).getZ());
+        }
+
+        int width = (maxX - minX) + 1;
+        int length = (maxZ - minZ) + 1;
+
+        // SQUARE AND SOLID??? The math works out here that this will only be true if the number of blocks found matches the side lengths squared. We don't need to check for holes manually!
+        if (visited.size() != length * width || length != width) return null;
+
+        return new PadInfo(new BlockPos(minX, y + 1, minZ), new BlockPos(maxX, y + towerHeight, maxZ));
+    }
+
+    private int getTowerHeight(@NotNull Level level, @NotNull BlockPos base) {
+        int h = 0;
+        BlockPos p = base.above();
+
+        while (level.getBlockState(p).is(TOWER_BLOCK)) {
+            h++;
+            p = p.above();
+        }
+        return h;
+    }
+
+    public RocketStructure scan() {
+        // TODO
+        throw new NotImplementedException();
+    }
+
+    @Override
+    public void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos) {
+
+    }
+
+    @Override
+    public void serverTick(ServerLevel level, long time, BlockState state, BlockPos pos) {
+        PadInfo newBounds = getPlatformFill();
+        setPadBoundsAndSync(newBounds);
+
+        boolean formed = newBounds != null;
+        if (state.getValue(AphelionBlockStateProperties.FORMED) != formed) {
+            level.setBlockAndUpdate(pos, state.setValue(AphelionBlockStateProperties.FORMED, formed));
+        }
+    }
+
+    @Override
+    public void firstTick(Level level, BlockState state, BlockPos pos) {
+        facing = getBlockState().getValue(BlockStateProperties.HORIZONTAL_FACING);
+        padScanStart = getBlockPos().mutable().below().relative(facing.getOpposite());
+        this.isInitialized = true;
+    }
+
+
+    private static boolean isPad(BlockState s) {
+        return s.is(ModTags.Blocks.LAUNCH_PAD); // or s.getBlock() == ModBlocks.PAD.get()
+    }
+
+    @Override
+    protected void saveAdditional(@NotNull CompoundTag tag, HolderLookup.@NotNull Provider registries) {
+        super.saveAdditional(tag, registries);
+
+        PadInfo pad = this.padBounds;
+        if (pad != null) {
+            tag.putLong("PadMin", padBounds.min().asLong());
+            tag.putLong("PadMax", padBounds.max().asLong());
+        }
+    }
+
+    @Override
+    protected void loadAdditional(@NotNull CompoundTag tag, HolderLookup.@NotNull Provider registries) {
+        super.loadAdditional(tag, registries);
+
+        if (tag.contains("PadMin") && tag.contains("PadMax")) {
+            BlockPos min = BlockPos.of(tag.getLong("PadMin"));
+            BlockPos max = BlockPos.of(tag.getLong("PadMax"));
+            this.padBounds = new PadInfo(min, max);
+        } else {
+            this.padBounds = null;
+        }
+    }
+
+    @Override
+    public @NotNull CompoundTag getUpdateTag(HolderLookup.@NotNull Provider registries) {
+        CompoundTag tag = super.getUpdateTag(registries);
+        saveAdditional(tag, registries);
+        return tag;
+    }
+
+    @Override
+    public void handleUpdateTag(@NotNull CompoundTag tag, HolderLookup.@NotNull Provider registries) {
+        loadAdditional(tag, registries);
+    }
+
+    private void setPadBoundsAndSync(@Nullable PadInfo newBounds) {
+        if (java.util.Objects.equals(this.padBounds, newBounds)) return;
+
+        this.padBounds = newBounds;
+        setChanged(); // marks BE dirty for saving
+
+        if (level instanceof ServerLevel server) {
+            BlockState state = getBlockState();
+            server.sendBlockUpdated(worldPosition, state, state, 3);
+        }
+    }
+
+    @Override
+    public Packet<ClientGamePacketListener> getUpdatePacket() {
+        // sends the tag from getUpdateTag()
+        return ClientboundBlockEntityDataPacket.create(this);
+    }
+
+    @Override
+    public void onDataPacket(@NotNull Connection net, ClientboundBlockEntityDataPacket pkt, HolderLookup.@NotNull Provider registries) {
+        // apply the received tag on client
+        CompoundTag tag = pkt.getTag();
+        if (tag != null) {
+            this.loadAdditional(tag, registries);
+        }
+    }
+}

src/main/java/net/xevianlight/aphelion/block/entity/custom/VacuumArcFurnaceControllerEntity.java

@@ -1,5 +1,6 @@
 package net.xevianlight.aphelion.block.entity.custom;
 
+import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.core.HolderLookup;
@@ -8,6 +9,7 @@ import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.Packet;
 import net.minecraft.network.protocol.game.ClientGamePacketListener;
 import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.Containers;
 import net.minecraft.world.MenuProvider;
 import net.minecraft.world.SimpleContainer;
@@ -28,14 +30,14 @@ import net.neoforged.neoforge.capabilities.Capabilities;
 import net.neoforged.neoforge.energy.IEnergyStorage;
 import net.neoforged.neoforge.items.IItemHandler;
 import net.neoforged.neoforge.items.ItemStackHandler;
-import net.xevianlight.aphelion.block.custom.ElectricArcFurnace;
+import net.xevianlight.aphelion.block.custom.VacuumArcFurnaceController;
+import net.xevianlight.aphelion.block.custom.base.TickableBlockEntity;
 import net.xevianlight.aphelion.block.entity.energy.ModEnergyStorage;
 import net.xevianlight.aphelion.core.init.ModBlockEntities;
 import net.xevianlight.aphelion.core.init.ModBlocks;
 import net.xevianlight.aphelion.recipe.ElectricArcFurnaceRecipe;
 import net.xevianlight.aphelion.recipe.ElectricArcFurnaceRecipeInput;
 import net.xevianlight.aphelion.recipe.ModRecipes;
-import net.xevianlight.aphelion.screen.VacuumArcFurnaceMenu;
 import net.xevianlight.aphelion.screen.ElectricArcFurnaceMenu;
 import net.xevianlight.aphelion.util.AphelionBlockStateProperties;
 import net.xevianlight.aphelion.util.IMultiblockController;
@@ -45,16 +47,16 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.Optional;
 
-public class VacuumArcFurnaceControllerEntity extends BlockEntity implements MenuProvider, IMultiblockController {
+public class VacuumArcFurnaceControllerEntity extends BlockEntity implements MenuProvider, IMultiblockController, TickableBlockEntity {
 
     private final int SIZE = 4;
-    private int ENERGY_CAPACITY = 64000;
-    private int MAX_TRANSFER = 320;
+    private final int ENERGY_CAPACITY = 64000;
+    private final int MAX_TRANSFER = 320;
     private int progress = 0;
     private int maxProgress = 100;
     private final int DEFAULT_MAX_PROGRESS = 100;
     private final ContainerData data;
-    private int MACHINE_ENERGY_COST = 20;
+    private final int MACHINE_ENERGY_COST = 20;
 
     public static final int INPUT_SLOT = 0;
     public static final int SECONDARY_INPUT_SLOT = 1;
@@ -99,7 +101,7 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
         @Override
         protected void onContentsChanged(int slot) {
             setChanged();
-            if(!level.isClientSide()) {
+            if (level != null && !level.isClientSide()) {
                 level.sendBlockUpdated(getBlockPos(), getBlockState(), getBlockState(), 3);
             }
         }
@@ -114,7 +116,8 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
 //        }
     };
 
-    public void tick(Level level, BlockPos pos, BlockState blockState) {
+    @Override
+    public void serverTick(ServerLevel level, long time, BlockState state, BlockPos pos) {
 
         if (dirty) {
             dirty = false;
@@ -124,7 +127,7 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
 
         BlockState newBlockState = level.getBlockState(pos);
 
-        if (!blockState.getValue(AphelionBlockStateProperties.FORMED))
+        if (!state.getValue(AphelionBlockStateProperties.FORMED))
             return;
 
         chargeFromItem();
@@ -135,7 +138,7 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
                 // Recipe detected! We have enough energy to process
                 progress++;
                 useEnergy();
-                level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, true));
+                level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, true));
                 setChanged(level, pos, newBlockState);
 
                 if (hasCraftingFinished()) {
@@ -144,13 +147,13 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
                 }
             } else if (hasFurnaceRecipe(INPUT_SLOT) && !hasEnoughEnergyToCraft(MACHINE_ENERGY_COST)) {
                 // Recipe detected but we ran out of power
-                level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, false));
+                level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, false));
                 setChanged(level, pos, newBlockState);
                 progress = progress > 0 ? progress - 1 : 0;
             } else {
                 // Invalid recipe
                 resetProgress();
-                level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, false));
+                level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, false));
                 setChanged(level, pos, newBlockState);
             }
         } else {
@@ -160,7 +163,7 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
                     // Alloy recipe detected! We have enough energy to process
                     progress++;
                     useEnergy();
-                    level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, true));
+                    level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, true));
                     setChanged(level, pos, newBlockState);
 
                     if (hasCraftingFinished()) {
@@ -169,14 +172,14 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
                     }
                 } else {
                     // Recipe detected but we ran out of power
-                    level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, false));
+                    level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, false));
                     setChanged(level, pos, newBlockState);
                     progress = progress > 0 ? progress - 1 : 0;
                 }
             } else {
                 // Invalid recipe
                 resetProgress();
-                level.setBlockAndUpdate(pos, newBlockState.setValue(ElectricArcFurnace.LIT, false));
+                level.setBlockAndUpdate(pos, newBlockState.setValue(VacuumArcFurnaceController.LIT, false));
                 setChanged(level, pos, newBlockState);
             }
         }
@@ -411,7 +414,7 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
     @Override
     public @Nullable AbstractContainerMenu createMenu(int i, Inventory inventory, Player player) {
         if (isFormed())
-            return new VacuumArcFurnaceMenu(i, inventory, this, this.data);
+            return new ElectricArcFurnaceMenu(i, inventory, this, this.data);
         return new ElectricArcFurnaceMenu(i, inventory, this, this.data);
     }
 
@@ -527,4 +530,14 @@ public class VacuumArcFurnaceControllerEntity extends BlockEntity implements Men
     public void markDirty() {
         dirty = true;
     }
+
+    @Override
+    public void clientTick(ClientLevel level, long time, BlockState state, BlockPos pos) {
+
+    }
+
+    @Override
+    public void firstTick(Level level, BlockState state, BlockPos pos) {
+
+    }
 }

src/main/java/net/xevianlight/aphelion/block/entity/custom/renderer/OxygenTestRenderer.java

@@ -12,6 +12,7 @@ import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.core.Vec3i;
 import net.minecraft.world.phys.AABB;
+import net.xevianlight.aphelion.Aphelion;
 import net.xevianlight.aphelion.block.entity.custom.OxygenTestBlockEntity;
 import org.joml.Matrix4f;
 import org.joml.Vector3f;
@@ -23,7 +24,10 @@ public class OxygenTestRenderer implements BlockEntityRenderer<OxygenTestBlockEn
     public OxygenTestRenderer (BlockEntityRendererProvider.Context context) {}
 
     private List<BlockPos> toBlockPositions(OxygenTestBlockEntity be) {
-        return be.getEnclosedBlocks();
+//        cache = be.getEnclosedBlocks();
+//        if (cache != null)
+//            return cache;
+        return List.of();
     }
 
     @Override
@@ -31,6 +35,8 @@ public class OxygenTestRenderer implements BlockEntityRenderer<OxygenTestBlockEn
         return AABB.ofSize(blockEntity.getBlockPos().getCenter(), OxygenTestBlockEntity.MAX_RANGE*2, OxygenTestBlockEntity.MAX_RANGE*2, OxygenTestBlockEntity.MAX_RANGE*2);
     }
 
+    List<BlockPos> cache;
+
     private Set<BlockPos> relativePositionsCache;
     @Override
     // If in debug mode, renders a model made from the blocks
@@ -42,7 +48,7 @@ public class OxygenTestRenderer implements BlockEntityRenderer<OxygenTestBlockEn
         // Renderers are relative to our block pos, so transform all points to be relative to block pos as well
         List<BlockPos> positionsToRender = toBlockPositions(be);
         BlockPos originPos = be.getBlockPos();
-        if (true) return;
+//        if (true) return;
 
         Set<BlockPos> relativePositions;
         if (relativePositionsCache != null) relativePositions = relativePositionsCache;

src/main/java/net/xevianlight/aphelion/block/entity/custom/renderer/RocketAssemblerBlockEntityRenderer.java

@@ -0,0 +1,44 @@
+package net.xevianlight.aphelion.block.entity.custom.renderer;
+
+import com.mojang.blaze3d.vertex.PoseStack;
+import com.mojang.blaze3d.vertex.VertexConsumer;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.LevelRenderer;
+import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.RenderType;
+import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
+import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.phys.AABB;
+import net.xevianlight.aphelion.block.entity.custom.RocketAssemblerBlockEntity;
+import org.jetbrains.annotations.NotNull;
+
+public class RocketAssemblerBlockEntityRenderer implements BlockEntityRenderer<RocketAssemblerBlockEntity> {
+
+    public RocketAssemblerBlockEntityRenderer (BlockEntityRendererProvider.Context context) {
+
+    }
+
+    @Override
+    public void render(@NotNull RocketAssemblerBlockEntity be, float v, @NotNull PoseStack poseStack, @NotNull MultiBufferSource multiBufferSource, int i, int i1) {
+        if (!Minecraft.getInstance().gui.getDebugOverlay().showDebugScreen()) return;
+
+        if (be.getPadBounds() == null) return;
+        BlockPos min = be.getPadBounds().min();
+        BlockPos max = be.getPadBounds().max();
+
+        AABB box = new AABB(
+                min.getX(), min.getY(), min.getZ(),
+                max.getX() + 1, max.getY() + 1, max.getZ() + 1
+        );
+
+        poseStack.pushPose();
+        poseStack.translate(-be.getBlockPos().getX(), -be.getBlockPos().getY(), -be.getBlockPos().getZ());
+
+        VertexConsumer vc = multiBufferSource.getBuffer(RenderType.lines());
+
+        LevelRenderer.renderLineBox(poseStack, vc, box, 0.0f, 1.0f, 0.0f, 1.0f);
+
+        poseStack.popPose();
+    }
+}

src/main/java/net/xevianlight/aphelion/client/AphelionDebugOverlay.java

@@ -2,6 +2,8 @@ package net.xevianlight.aphelion.client;
 
 import net.minecraft.client.Minecraft;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
 import net.minecraft.world.level.dimension.DimensionType;
 import net.neoforged.bus.api.SubscribeEvent;
 import net.neoforged.fml.common.EventBusSubscriber;
@@ -11,7 +13,8 @@ import net.xevianlight.aphelion.Aphelion;
 import net.xevianlight.aphelion.client.dimension.DimensionRenderer;
 import net.xevianlight.aphelion.client.dimension.DimensionRendererCache;
 import net.xevianlight.aphelion.client.dimension.SpaceSkyEffects;
-import net.xevianlight.aphelion.core.space.SpacePartitionSavedData;
+import net.xevianlight.aphelion.core.saveddata.EnvironmentSavedData;
+import net.xevianlight.aphelion.core.saveddata.SpacePartitionSavedData;
 import net.xevianlight.aphelion.util.SpacePartitionHelper;
 
 @EventBusSubscriber(modid = Aphelion.MOD_ID, value = Dist.CLIENT)
@@ -50,5 +53,13 @@ public class AphelionDebugOverlay {
         event.getLeft().add(" Orbit: " + orbitId);
 //        event.getLeft().add(" Sky: " + rendererSummary);
         event.getLeft().add(" Station: " +  x + " " + z + "   ID: " + SpacePartitionSavedData.pack(x,z));
+        event.getLeft().add(" Station Destination:" + PartitionClientState.lastData().getDestination());
+        var server = mc.getSingleplayerServer();
+        ServerLevel singlePlayerLevel;
+        if (server != null) {
+            singlePlayerLevel = server.getLevel(mc.level.dimension());
+            if (singlePlayerLevel != null)
+                event.getLeft().add(" Oxygen: " + EnvironmentSavedData.get(singlePlayerLevel).hasOxygen(singlePlayerLevel, mc.player.blockPosition().mutable().above()));
+        }
     }
 }

src/main/java/net/xevianlight/aphelion/client/ClientOxygenCache.java

@@ -0,0 +1,10 @@
+package net.xevianlight.aphelion.client;
+
+import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
+import net.minecraft.core.BlockPos;
+
+public final class ClientOxygenCache {
+    public static final LongOpenHashSet OXYGEN = new LongOpenHashSet();
+    public static BlockPos lastCenter = BlockPos.ZERO;
+    public static long lastUpdateGameTime = -1;
+}

src/main/java/net/xevianlight/aphelion/client/OxygenDebugRender.java

@@ -0,0 +1,118 @@
+package net.xevianlight.aphelion.client;
+
+import com.mojang.blaze3d.vertex.DefaultVertexFormat;
+import com.mojang.blaze3d.vertex.PoseStack;
+import com.mojang.blaze3d.vertex.VertexConsumer;
+import com.mojang.blaze3d.vertex.VertexFormat;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.RenderStateShard;
+import net.minecraft.client.renderer.RenderType;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.neoforged.api.distmarker.Dist;
+import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.fml.common.EventBusSubscriber;
+import net.neoforged.neoforge.client.event.RenderLevelStageEvent;
+import net.xevianlight.aphelion.Aphelion;
+import org.joml.Matrix4f;
+
+@EventBusSubscriber(modid = Aphelion.MOD_ID, value = Dist.CLIENT)
+public final class OxygenDebugRender {
+
+    // Untextured translucent quads (POSITION_COLOR only)
+    private static final RenderType OXYGEN_FILL = RenderType.create(
+            "aphelion_oxygen_fill",
+            DefaultVertexFormat.POSITION_COLOR,
+            VertexFormat.Mode.QUADS,
+            256,
+            false,
+            true,
+            RenderType.CompositeState.builder()
+                    .setShaderState(RenderStateShard.POSITION_COLOR_SHADER)
+                    .setTransparencyState(RenderStateShard.TRANSLUCENT_TRANSPARENCY)
+                    .setCullState(RenderStateShard.NO_CULL)
+                    .setDepthTestState(RenderStateShard.LEQUAL_DEPTH_TEST)
+                    .setWriteMaskState(RenderStateShard.COLOR_DEPTH_WRITE)
+                    .createCompositeState(true)
+    );
+
+    @SubscribeEvent
+    public static void onRenderLevel(RenderLevelStageEvent event) {
+        // One stage only (pick one that exists and looks good)
+        if (event.getStage() != RenderLevelStageEvent.Stage.AFTER_TRANSLUCENT_BLOCKS) return;
+
+        Minecraft mc = Minecraft.getInstance();
+        if (mc.level == null || mc.player == null) return;
+        if (!mc.gui.getDebugOverlay().showDebugScreen()) return;
+
+        PoseStack poseStack = event.getPoseStack();
+        var cam = mc.gameRenderer.getMainCamera();
+        var camPos = cam.getPosition();
+
+        poseStack.pushPose();
+        poseStack.translate(-camPos.x, -camPos.y, -camPos.z);
+
+        MultiBufferSource.BufferSource bufferSource = mc.renderBuffers().bufferSource();
+        VertexConsumer vc = bufferSource.getBuffer(OXYGEN_FILL);
+
+        // Render surface faces only (fast + pretty)
+        for (long l : ClientOxygenCache.OXYGEN) {
+            BlockPos p = BlockPos.of(l);
+            drawSurfaceFaces(poseStack, vc, p);
+        }
+
+        poseStack.popPose();
+        bufferSource.endBatch(OXYGEN_FILL);
+    }
+
+    private static void drawSurfaceFaces(PoseStack poseStack, VertexConsumer vc, BlockPos p) {
+        // Neighbor checks: only render faces exposed to non-oxygen
+        boolean up    = ClientOxygenCache.OXYGEN.contains(p.above().asLong());
+        boolean down  = ClientOxygenCache.OXYGEN.contains(p.below().asLong());
+        boolean north = ClientOxygenCache.OXYGEN.contains(p.north().asLong());
+        boolean south = ClientOxygenCache.OXYGEN.contains(p.south().asLong());
+        boolean east  = ClientOxygenCache.OXYGEN.contains(p.east().asLong());
+        boolean west  = ClientOxygenCache.OXYGEN.contains(p.west().asLong());
+
+        if (up && down && north && south && east && west) return;
+
+        final float eps = 0.0025f;
+        float x0 = p.getX() + eps;
+        float y0 = p.getY() + eps;
+        float z0 = p.getZ() + eps;
+        float x1 = p.getX() + 1 - eps;
+        float y1 = p.getY() + 1 - eps;
+        float z1 = p.getZ() + 1 - eps;
+
+        // Color (ARGB-ish but as floats)
+        float r = 0.2f, g = 0.8f, b = 1.0f, a = 0.18f;
+
+        Matrix4f mat = poseStack.last().pose();
+
+        // IMPORTANT: vertex winding should be consistent (counter-clockwise)
+        if (!up)    quad(mat, vc, x0,y1,z0,  x1,y1,z0,  x1,y1,z1,  x0,y1,z1,  r,g,b,a);
+        if (!down)  quad(mat, vc, x0,y0,z1,  x1,y0,z1,  x1,y0,z0,  x0,y0,z0,  r,g,b,a);
+
+        if (!north) quad(mat, vc, x1,y0,z0,  x0,y0,z0,  x0,y1,z0,  x1,y1,z0,  r,g,b,a);
+        if (!south) quad(mat, vc, x0,y0,z1,  x1,y0,z1,  x1,y1,z1,  x0,y1,z1,  r,g,b,a);
+
+        if (!east)  quad(mat, vc, x1,y0,z1,  x1,y0,z0,  x1,y1,z0,  x1,y1,z1,  r,g,b,a);
+        if (!west)  quad(mat, vc, x0,y0,z0,  x0,y0,z1,  x0,y1,z1,  x0,y1,z0,  r,g,b,a);
+    }
+
+    private static void quad(
+            Matrix4f mat, VertexConsumer vc,
+            float x0, float y0, float z0,
+            float x1, float y1, float z1,
+            float x2, float y2, float z2,
+            float x3, float y3, float z3,
+            float r, float g, float b, float a
+    ) {
+        // POSITION_COLOR format: ONLY position + color.
+        vc.addVertex(mat, x0, y0, z0).setColor(r, g, b, a);
+        vc.addVertex(mat, x1, y1, z1).setColor(r, g, b, a);
+        vc.addVertex(mat, x2, y2, z2).setColor(r, g, b, a);
+        vc.addVertex(mat, x3, y3, z3).setColor(r, g, b, a);
+    }
+}

src/main/java/net/xevianlight/aphelion/client/PartitionClientState.java

@@ -1,20 +1,29 @@
 package net.xevianlight.aphelion.client;
 
-import net.xevianlight.aphelion.network.packet.PartitionData;
+import net.xevianlight.aphelion.core.saveddata.types.PartitionData;
+import net.xevianlight.aphelion.network.packet.PartitionPayload;
 
 import java.util.Optional;
 
 public final class PartitionClientState {
-    private static volatile PartitionData last = null;
+    private static volatile PartitionPayload last = null;
 
-    public static void set(PartitionData d) { last = d; }
+    public static void set(PartitionPayload d) { last = d; }
 
-    public static Optional<PartitionData> get() {
+    public static Optional<PartitionPayload> get() {
         return Optional.ofNullable(last);
     }
 
     public static String idOrUnknown() {
-        return last != null ? last.id() : "unknown";
+        String orbit = String.valueOf(last.partitionData().getOrbit());
+        if (orbit == null) {
+            return "aphleion:orbit/default";
+        }
+        return last != null ? orbit : "unknown";
+    }
+
+    public static PartitionData lastData() {
+        return last.partitionData();
     }
 //
 //    public static int pxOr(int fallback) {

src/main/java/net/xevianlight/aphelion/client/dimension/DimensionSkyEffects.java

@@ -71,7 +71,7 @@ public class DimensionSkyEffects extends DimensionSpecialEffects {
 //        int py = PartitionClientState.pyOr(0);
         var data = ResourceLocation.parse(PartitionClientState.idOrUnknown());
 
-//        var data = SpacePartitionSavedData.get(serverLevel).getOrbitForPartition((int)   x, (int) z);
+//        var partitionData = SpacePartitionSavedData.get(serverLevel).getOrbitForPartition((int)   x, (int) z);
         if (data != null) return data;
 
         return ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, "orbit/default");

src/main/java/net/xevianlight/aphelion/client/dimension/SpaceSkyEffects.java

@@ -5,12 +5,9 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.client.renderer.DimensionSpecialEffects;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.server.MinecraftServer;
-import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.phys.Vec3;
 import net.xevianlight.aphelion.Aphelion;
 import net.xevianlight.aphelion.client.PartitionClientState;
-import net.xevianlight.aphelion.core.space.SpacePartitionSavedData;
 import net.xevianlight.aphelion.util.SpacePartitionHelper;
 import org.jetbrains.annotations.Nullable;
 import org.joml.Matrix4f;
@@ -29,7 +26,7 @@ public class SpaceSkyEffects extends DimensionSpecialEffects {
             return ResourceLocation.withDefaultNamespace("overworld");
         }
         if (effectsId.equals(Aphelion.id("space"))) {
-            return SpaceSkyEffects.orbitForPos(camera.getPosition()); // or inline this logic
+            return orbitForPos(camera.getPosition()); // or inline this logic
         }
         return effectsId;
     }
@@ -80,7 +77,7 @@ public class SpaceSkyEffects extends DimensionSpecialEffects {
 //        int py = PartitionClientState.pyOr(0);
         var data = ResourceLocation.parse(PartitionClientState.idOrUnknown());
 
-//        var data = SpacePartitionSavedData.get(serverLevel).getOrbitForPartition((int)   x, (int) z);
+//        var partitionData = SpacePartitionSavedData.get(serverLevel).getOrbitForPartition((int)   x, (int) z);
         if (data != null) return data;
 
         return ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, "orbit/default");

src/main/java/net/xevianlight/aphelion/commands/AphelionCommand.java

@@ -15,17 +15,18 @@ import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.chat.*;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.server.level.ColumnPos;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.RelativeMovement;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Blocks;
 import net.xevianlight.aphelion.Aphelion;
-import net.xevianlight.aphelion.core.space.SpacePartitionSavedData;
+import net.xevianlight.aphelion.core.saveddata.SpacePartitionSavedData;
 import net.xevianlight.aphelion.entites.vehicles.RocketEntity;
+import net.xevianlight.aphelion.planet.Planet;
 import net.xevianlight.aphelion.util.RocketStructure;
 import net.xevianlight.aphelion.util.SpacePartitionHelper;
+import net.xevianlight.aphelion.util.registries.ModRegistries;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.EnumSet;
@@ -244,6 +245,24 @@ public class AphelionCommand {
                                         )
                                 )
                         )
+                        .then(Commands.literal("destination")
+                                .then(Commands.literal("set").then(
+                                        Commands.argument("pos", ColumnPosArgument.columnPos())
+                                            .then(Commands.argument("id", ResourceLocationArgument.id())
+                                                    .executes(context -> {
+                                                        int x = SpacePartitionHelper.get(ColumnPosArgument.getColumnPos(context, "pos").x());
+                                                        int z = SpacePartitionHelper.get(ColumnPosArgument.getColumnPos(context, "pos").z());
+                                                        ResourceLocation orbit = ResourceLocationArgument.getId(context, "id");
+
+                                                        ServerLevel level = context.getSource().getLevel();
+                                                        SpacePartitionSavedData.get(level).getData(x,z).setDestination(orbit);
+
+                                                        return 1;
+                                                    })
+                                            )
+                                        )
+                                )
+                        )
                 )
                 .then(Commands.literal("planet")
                         .then(Commands.literal("tp")

src/main/java/net/xevianlight/aphelion/core/KeyVariables.java

@@ -1,69 +0,0 @@
-package net.xevianlight.aphelion.core;
-
-import net.minecraft.client.KeyMapping;
-import net.minecraft.client.Minecraft;
-import net.minecraft.world.entity.player.Player;
-
-import java.util.HashMap;
-import java.util.Map;
-import java.util.UUID;
-
-public class KeyVariables {
-
-    public static final Map<UUID, Boolean> KEY_UP = new HashMap<>();
-    public static final Map<UUID, Boolean> KEY_DOWN = new HashMap<>();
-    public static final Map<UUID, Boolean> KEY_RIGHT = new HashMap<>();
-    public static final Map<UUID, Boolean> KEY_LEFT = new HashMap<>();
-    public static final Map<UUID, Boolean> KEY_JUMP = new HashMap<>();
-    public static final Map<UUID, Boolean> KEY_TABLET = new HashMap<>();
-
-    public static boolean isHoldingUp(Player player) {
-        return player != null && KEY_UP.getOrDefault(player.getUUID(), false);
-    }
-
-    public static boolean isHoldingDown(Player player) {
-        return player != null && KEY_DOWN.getOrDefault(player.getUUID(), false);
-    }
-
-    public static boolean isHoldingRight(Player player) {
-        return player != null && KEY_RIGHT.getOrDefault(player.getUUID(), false);
-    }
-
-    public static boolean isHoldingLeft(Player player) {
-        return player != null && KEY_LEFT.getOrDefault(player.getUUID(), false);
-    }
-
-    public static boolean isHoldingJump(Player player) {
-        return player != null && KEY_JUMP.getOrDefault(player.getUUID(), false);
-    }
-
-    public static boolean getHoldingTabletPress(Player player) {
-        return player != null && KEY_TABLET.getOrDefault(player.getUUID(), false);
-    }
-
-
-    public static Map<KeyMapping, String> getKey(Minecraft minecraft) {
-        Map<KeyMapping, String> key = new HashMap<>();
-        key.put(minecraft.options.keyUp, "key_up");
-        key.put(minecraft.options.keyDown, "key_down");
-        key.put(minecraft.options.keyRight, "key_right");
-        key.put(minecraft.options.keyLeft, "key_left");
-        key.put(minecraft.options.keyJump, "key_jump");
-        return key;
-    }
-
-    public static void setKeyVariable(String key, UUID uuid, Boolean bool) {
-        switch (key) {
-            case "key_up":
-                KEY_UP.put(uuid, bool);
-            case "key_down":
-                KEY_DOWN.put(uuid, bool);
-            case "key_right":
-                KEY_RIGHT.put(uuid, bool);
-            case "key_left":
-                KEY_LEFT.put(uuid, bool);
-            case "key_jump":
-                KEY_JUMP.put(uuid, bool);
-        }
-    }
-}

src/main/java/net/xevianlight/aphelion/core/init/ModBlockEntities.java

@@ -46,4 +46,14 @@ public class ModBlockEntities {
             BLOCK_ENTITIES.register("oxygen_test_block_entity", () -> BlockEntityType.Builder.of(
                     OxygenTestBlockEntity::new, ModBlocks.OXYGEN_TEST_BLOCK.get()).build(null)
             );
+
+    public static final Supplier<BlockEntityType<RocketAssemblerBlockEntity>> ROCKET_ASSEMBLER_BLOCK_ENTITY =
+            BLOCK_ENTITIES.register("rocket_assembler_block_entity", () -> BlockEntityType.Builder.of(
+                    RocketAssemblerBlockEntity::new, ModBlocks.ROCKET_ASSEMBLER_BLOCK.get()).build(null)
+            );
+
+    public static final Supplier<BlockEntityType<PipeTestBlockEntity>> PIPE_TEST_BLOCK_ENTITY =
+            BLOCK_ENTITIES.register("pipe_test_block_entity", () -> BlockEntityType.Builder.of(
+                    PipeTestBlockEntity::new, ModBlocks.PIPE_TEST_BLOCK.get()).build(null)
+            );
 }

src/main/java/net/xevianlight/aphelion/core/init/ModBlocks.java

@@ -12,10 +12,13 @@ public class ModBlocks {
 
     public static final  DeferredBlock<Block> TEST_BLOCK = BLOCKS.register("test_block", () -> new TestBlock(TestBlock.getProperties()));
     public static final  DeferredBlock<Block> BLOCK_STEEL = BLOCKS.register("block_steel", () -> new BlockSteel(BlockSteel.getProperties()));
+    public static final  DeferredBlock<Block> LAUNCH_PAD = BLOCKS.register("launch_pad", () -> new LaunchPad(LaunchPad.getProperties()));
     public static final  DeferredBlock<Block> DIMENSION_CHANGER = BLOCKS.register("dimension_changer", () -> new DimensionChangerBlock(DimensionChangerBlock.getProperties()));
     public static final  DeferredBlock<Block> ELECTRIC_ARC_FURNACE = BLOCKS.register("electric_arc_furnace", () -> new ElectricArcFurnace(ElectricArcFurnace.getProperties()));
     public static final  DeferredBlock<Block> ARC_FURNACE_CASING_BLOCK = BLOCKS.register("arc_furnace_casing", () -> new ArcFurnaceCasingBlock(ArcFurnaceCasingBlock.getProperties()));
     public static final  DeferredBlock<Block> VACUUM_ARC_FURNACE_CONTROLLER = BLOCKS.register("vacuum_arc_furnace_controller", () -> new VacuumArcFurnaceController(VacuumArcFurnaceController.getProperties()));
     public static final  DeferredBlock<Block> VAF_MULTIBLOCK_DUMMY_BLOCK = BLOCKS.register("vaf_dummy_block", () -> new VAFMultiblockDummyBlock(VAFMultiblockDummyBlock.getProperties()));
     public static final DeferredBlock<Block> OXYGEN_TEST_BLOCK = BLOCKS.register("oxygen_test_block", () -> new OxygenTestBlock(OxygenTestBlock.getProperties()));
+    public static final DeferredBlock<Block> ROCKET_ASSEMBLER_BLOCK = BLOCKS.register("rocket_assembler_block", () -> new RocketAssemblerBlock(RocketAssemblerBlock.getProperties()));
+    public static final DeferredBlock<Block> PIPE_TEST_BLOCK = BLOCKS.register("pipe", () -> new PipeTestBlock(PipeTestBlock.getProperties()));
 }

src/main/java/net/xevianlight/aphelion/core/init/ModCreativeTabs.java

@@ -41,5 +41,7 @@ public class ModCreativeTabs {
                         output.accept(ModItems.BLOCK_STEEL);
                         output.accept(ModItems.ARC_FURNACE_CASING_BLOCK);
                         output.accept(ModItems.VACUUM_ARC_FURNACE_CONTROLLER);
+                        output.accept(ModItems.LAUNCH_PAD);
+                        output.accept(ModItems.ROCKET_ASSEMBLER_BLOCK);
                     }).build());
 }

src/main/java/net/xevianlight/aphelion/core/init/ModDamageSources.java

@@ -0,0 +1,19 @@
+package net.xevianlight.aphelion.core.init;
+
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.damagesource.DamageSource;
+import net.minecraft.world.damagesource.DamageType;
+import net.minecraft.world.level.Level;
+import net.xevianlight.aphelion.Aphelion;
+
+public class ModDamageSources {
+
+    // Relatively sure this is right
+    public static final ResourceKey<DamageType> OXYGEN = ResourceKey.create(Registries.DAMAGE_TYPE, ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, "oxygen"));
+
+    public static DamageSource create(Level level, ResourceKey<DamageType> key) {
+        return new DamageSource(level.registryAccess().registryOrThrow(Registries.DAMAGE_TYPE).getHolderOrThrow(key));
+    }
+}

src/main/java/net/xevianlight/aphelion/core/init/ModItems.java

@@ -36,5 +36,8 @@ public static final DeferredItem<Item> MUSIC_DISC_BIT_SHIFT = ITEMS.register("mu
     public static final DeferredItem<BlockItem> ARC_FURNACE_CASING_BLOCK = ITEMS.register("arc_furnace_casing", () -> new BlockItem(ModBlocks.ARC_FURNACE_CASING_BLOCK.get(), ArcFurnaceCasingBlock.getItemProperties()));
     public static final DeferredItem<BlockItem> VACUUM_ARC_FURNACE_CONTROLLER = ITEMS.register("vacuum_arc_furnace_controller", () -> new BlockItem(ModBlocks.VACUUM_ARC_FURNACE_CONTROLLER.get(), VacuumArcFurnaceController.getItemProperties()));
     public static final DeferredItem<BlockItem> OXYGEN_TEST_BLOCK = ITEMS.register("oxygen_test_block", () -> new BlockItem(ModBlocks.OXYGEN_TEST_BLOCK.get(), new Item.Properties()));
+    public static final DeferredItem<BlockItem> PIPE_TEST_BLOCK = ITEMS.register("pipe", () -> new BlockItem(ModBlocks.PIPE_TEST_BLOCK.get(), new Item.Properties()));
+    public static final DeferredItem<BlockItem> LAUNCH_PAD = ITEMS.register("launch_pad", () -> new BlockItem(ModBlocks.LAUNCH_PAD.get(), LaunchPad.getItemProperties()));
+    public static final DeferredItem<BlockItem> ROCKET_ASSEMBLER_BLOCK = ITEMS.register("rocket_assembler_block", () -> new BlockItem(ModBlocks.ROCKET_ASSEMBLER_BLOCK.get(), RocketAssemblerBlock.getItemProperties()));
 //    public static final DeferredItem<BlockItem> VAF_MULTIBLOCK_DUMMY_BLOCK = ITEMS.register("vaf_multiblock_dummy_block", () -> new BlockItem(ModBlocks.VAF_MULTIBLOCK_DUMMY_BLOCK.get(), VAFMultiblockDummyBlock.getItemProperties()));
 }

src/main/java/net/xevianlight/aphelion/core/init/ModSounds.java

@@ -23,6 +23,8 @@ public class ModSounds {
     public static final Supplier<SoundEvent> BIT_SHIFT = registerSoundEvent("bit_shift");
     public static final  ResourceKey<JukeboxSong> BIT_SHIFT_KEY = createSong("bit_shift");
 
+    public static final Supplier<SoundEvent> ROCKET_ENGINE = registerSoundEvent("rocket_engine");
+
     private static Supplier<SoundEvent> registerSoundEvent(String name) {
         ResourceLocation id = ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, name);
         return SOUND_EVENTS.register(name, () -> SoundEvent.createVariableRangeEvent(id));

src/main/java/net/xevianlight/aphelion/core/saveddata/EnvironmentSavedData.java

@@ -0,0 +1,256 @@
+package net.xevianlight.aphelion.core.saveddata;
+
+import com.jcraft.jorbis.Block;
+import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap;
+import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
+import net.minecraft.client.Minecraft;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.saveddata.SavedData;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.client.ClientOxygenCache;
+import net.xevianlight.aphelion.core.saveddata.types.EnvironmentData;
+import net.xevianlight.aphelion.planet.Planet;
+import net.xevianlight.aphelion.planet.PlanetCache;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ * Pattern:
+ *  - World-level SavedData
+ *  - Outer map keyed by section (chunkX, sectionY, chunkZ) packed into a long
+ *  - Inner map keyed by localIndex (0..4095) -> packed int env value
+ *
+ * Sparse by design: blocks not present in the inner map are implicitly "default environment".
+ */
+public class EnvironmentSavedData extends SavedData {
+
+    private final Long2IntOpenHashMap envData = new Long2IntOpenHashMap();
+
+    private static final String NAME = "aphelion_environment";
+
+    public static EnvironmentSavedData create() {
+        return new EnvironmentSavedData();
+    }
+
+    @Override
+    @NotNull
+    public CompoundTag save(@NotNull CompoundTag tag, @NotNull HolderLookup.Provider provider) {
+        int size = envData.size();
+        long[] positions = new long[size];
+        int[] data = new int[size];
+
+        int i = 0;
+        for (var e : envData.long2IntEntrySet()) {
+            positions[i] = e.getLongKey();
+            data[i] = e.getIntValue();
+            i++;
+        }
+
+        tag.putLongArray("Position", positions);
+        tag.putIntArray("Value", data);
+
+        return tag;
+    }
+
+    public static EnvironmentSavedData load(CompoundTag tag, HolderLookup.Provider lookupProvider) {
+        EnvironmentSavedData data = create();
+
+        if (!tag.contains("Position", Tag.TAG_LONG_ARRAY) || !tag.contains("Value", Tag.TAG_INT_ARRAY)) { return data; }
+
+        long[] positions = tag.getLongArray("Position");
+        int[] values = tag.getIntArray("Value");
+
+        int length = Math.min(positions.length, values.length);
+
+        data.envData.ensureCapacity(length);
+
+        for (int i = 0; i < length; i++) {
+            data.envData.put(positions[i], values[i]);
+        }
+
+        return data;
+    }
+
+    public EnvironmentData getDataForPosition(Level level, BlockPos pos) {
+        Planet planet = PlanetCache.getByDimensionOrNull(level.dimension());
+        int packedDefault;
+
+        if (planet == null) {
+            packedDefault = EnvironmentData.DEFAULT_PACKED;
+        } else {
+            EnvironmentData planetData = new EnvironmentData(planet.oxygen(), EnvironmentData.DEFAULT_TEMPERATURE, (short) planet.gravity());
+            packedDefault = planetData.pack();
+        }
+        int packed = envData.getOrDefault(pos.asLong(),packedDefault);
+        return EnvironmentData.unpack(packed);
+    }
+
+    public void setDataForPosition(Level level, BlockPos pos, EnvironmentData data) {
+        putOrRemove(level, pos.asLong(), data.pack());
+    }
+
+    public boolean hasOxygen(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        return data.hasOxygen();
+    }
+
+    public void setOxygen(Level level, BlockPos pos, boolean value) {
+        var data = getDataForPosition(level, pos);
+//        Aphelion.LOGGER.info("Set oxygen for {} to {}", pos, value);
+        putOrRemove(level, pos.asLong(), data.withOxygen(value).pack());
+    }
+
+    public void setOxygen(Level level, Collection<BlockPos> positions, boolean value) {
+        for (BlockPos pos : positions) {
+            setOxygen(level, pos, value);
+        }
+    }
+
+    public void resetOxygen(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        putOrRemove(level, pos.asLong(), data.withOxygen(defaultData(level).hasOxygen()).pack());
+    }
+
+    public void resetOxygen(Level level, Collection<BlockPos> positions) {
+        for (BlockPos pos : positions) {
+            resetOxygen(level, pos);
+        }
+    }
+
+    public float getGravity(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        return data.getGravity();
+    }
+
+    public void setGravity(Level level, BlockPos pos, float value) {
+        var data = getDataForPosition(level, pos);
+        putOrRemove(level, pos.asLong(), data.withGravity(value).pack());
+    }
+
+    public void setGravity(Level level, Collection<BlockPos> positions, float value) {
+        for (BlockPos pos : positions) {
+            setGravity(level, pos, value);
+        }
+    }
+
+    public void resetGravity(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        putOrRemove(level, pos.asLong(), data.withGravity(defaultData(level).getGravity()).pack());
+    }
+
+    public short getTemperature(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        return data.getTemperature();
+    }
+
+    public void setTemperature(Level level, BlockPos pos, short value) {
+        var data = getDataForPosition(level, pos);
+        putOrRemove(level, pos.asLong(), data.withTemperature(value).pack());
+    }
+
+    public void setTemperature(Level level, Collection<BlockPos> positions, short value) {
+        for (BlockPos pos : positions) {
+            setTemperature(level, pos, value);
+        }
+    }
+
+    public void resetTemperature(Level level, BlockPos pos) {
+        var data = getDataForPosition(level, pos);
+        putOrRemove(level, pos.asLong(), data.withTemperature((defaultData(level).getTemperature())).pack());
+    }
+
+    private void putOrRemove(Level level, long key, int packed) {
+        if (packed == defaultPacked(level)) {
+            envData.remove(key);
+        } else {
+            envData.put(key, packed);
+        }
+        setDirty();
+    }
+
+    private static int defaultPacked(Level level) {
+        Planet planet = PlanetCache.getByDimensionOrNull(level.dimension());
+        if (planet == null) return EnvironmentData.DEFAULT_PACKED;
+
+        // NOTE: adjust gravity/temperature defaults to whatever your data model intends
+        EnvironmentData planetData = new EnvironmentData(
+                planet.oxygen(),
+                EnvironmentData.DEFAULT_TEMPERATURE,
+                (short) planet.gravity()
+        );
+        return planetData.pack();
+    }
+
+    private static EnvironmentData defaultData(Level level) {
+        return EnvironmentData.unpack(defaultPacked(level));
+    }
+
+    public static EnvironmentSavedData get(ServerLevel level) {
+        return level.getDataStorage().computeIfAbsent(
+                new Factory<>(EnvironmentSavedData::create, EnvironmentSavedData::load),
+                NAME
+        );
+    }
+
+    public static void refreshFromIntegratedServerIfNeeded(Minecraft mc, int radius, int maxBlocks) {
+        if (mc.level == null || mc.player == null) return;
+
+        long gameTime = mc.level.getGameTime();
+        if (ClientOxygenCache.lastUpdateGameTime != -1 && gameTime - ClientOxygenCache.lastUpdateGameTime < 20) return; // every 1s
+
+        BlockPos center = mc.player.blockPosition();
+        if (center.distManhattan(ClientOxygenCache.lastCenter) < 1) return; // don’t refresh if player barely moved
+
+        var server = mc.getSingleplayerServer();
+        if (server == null) return;
+
+        // IMPORTANT: execute on server thread
+        server.execute(() -> {
+            var serverLevel = server.getLevel(mc.level.dimension());
+            if (serverLevel == null) return;
+
+            EnvironmentSavedData env = EnvironmentSavedData.get(serverLevel);
+
+            LongOpenHashSet found = new LongOpenHashSet();
+
+            int r = radius;
+            int scanned = 0;
+
+            // Scan a cube-ish region
+            for (int dy = -r; dy <= r; dy++) {
+                for (int dz = -r; dz <= r; dz++) {
+                    for (int dx = -r; dx <= r; dx++) {
+                        if (found.size() >= maxBlocks) break;
+
+                        BlockPos p = center.offset(dx, dy, dz);
+
+                        // optional: skip non-air or skip solid blocks (visual preference)
+                        // if (!serverLevel.getBlockState(p).isAir()) continue;
+
+                        if (env.hasOxygen(serverLevel, p)) {
+                            found.add(p.asLong());
+                        }
+
+                        scanned++;
+                    }
+                }
+            }
+
+            // Copy results back to client thread safely
+            mc.execute(() -> {
+                ClientOxygenCache.OXYGEN.clear();
+                ClientOxygenCache.OXYGEN.addAll(found);
+                ClientOxygenCache.lastCenter = center;
+                ClientOxygenCache.lastUpdateGameTime = gameTime;
+            });
+        });
+    }
+
+}

src/main/java/net/xevianlight/aphelion/core/saveddata/GravitySavedData.java

@@ -0,0 +1,161 @@
+package net.xevianlight.aphelion.core.saveddata;
+
+import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.saveddata.SavedData;
+import net.xevianlight.aphelion.core.saveddata.types.GravityData;
+import net.xevianlight.aphelion.planet.Planet;
+import net.xevianlight.aphelion.planet.PlanetCache;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Pattern:
+ *  - World-level SavedData
+ *  - Outer map keyed by section (chunkX, sectionY, chunkZ) packed into a long
+ *  - Inner map keyed by localIndex (0..4095) -> packed int env value
+ *
+ * Sparse by design: blocks not present in the inner map are implicitly "default environment".
+ */
+public class GravitySavedData extends SavedData {
+
+    private final Long2IntOpenHashMap gravityData = new Long2IntOpenHashMap();
+
+    private static final String NAME = "aphelion_gravity";
+
+    public static GravitySavedData create() {
+        return new GravitySavedData();
+    }
+
+    @Override
+    @NotNull
+    public CompoundTag save(@NotNull CompoundTag tag, @NotNull HolderLookup.Provider provider) {
+        int size = gravityData.size();
+        long[] positions = new long[size];
+        int[] data = new int[size];
+
+        int i = 0;
+        for (var e : gravityData.long2IntEntrySet()) {
+            positions[i] = e.getLongKey();
+            data[i] = e.getIntValue();
+            i++;
+        }
+
+        tag.putLongArray("Position", positions);
+        tag.putIntArray("Value", data);
+
+        return tag;
+    }
+
+    public static GravitySavedData load(CompoundTag tag, HolderLookup.Provider lookupProvider) {
+        GravitySavedData data = create();
+
+        if (!tag.contains("Position", Tag.TAG_LONG_ARRAY) || !tag.contains("Value", Tag.TAG_INT_ARRAY)) { return data; }
+
+        long[] positions = tag.getLongArray("Position");
+        int[] values = tag.getIntArray("Value");
+
+        int length = Math.min(positions.length, values.length);
+
+        data.gravityData.ensureCapacity(length);
+
+        for (int i = 0; i < length; i++) {
+            data.gravityData.put(positions[i], values[i]);
+        }
+
+        return data;
+    }
+
+    private static final int ABSENT = Integer.MIN_VALUE;
+
+    public @Nullable GravityData getGravityRegionData (Level level, BlockPos center) {
+        GravityData data = GravityData.unpack(gravityData.getOrDefault(center.asLong(), ABSENT));
+        return data.pack() == ABSENT ? null : data;
+    }
+
+    public void removeGravityRegion (BlockPos pos) {
+        gravityData.remove(pos.asLong());
+    }
+
+    public void setGravityRegion (BlockPos pos, GravityData data) {
+        gravityData.put(pos.asLong(), data.pack());
+    }
+
+
+
+    /**
+     * Returns the cumulative sum of the acceleration for all gravity regions that overlap this block position
+     */
+    public float getGravitySum (BlockPos pos) {
+        float sum = 0;
+
+        List<GravityData> regions = getGravityRegions(pos);
+
+        for (var e : regions) {
+            sum += e.getGravity();
+        }
+
+        return sum;
+    }
+
+    /**
+     * Returns the strongest acceleration among all gravity regions that overlap this block position
+     */
+    public float getGravityMax (BlockPos pos) {
+        float max = 0;
+
+        List<GravityData> regions = getGravityRegions(pos);
+
+        for (var e : regions) {
+            var accel = e.getGravity();
+            if (accel > max) max = accel;
+        }
+
+        return max;
+    }
+
+    /**
+     * Returns a list of all gravity data objects overlapping this position. NOTE: does not contain position of the regions
+     */
+    public List<GravityData> getGravityRegions (BlockPos pos) {
+        List<GravityData> regions = new ArrayList<>();
+        for (var entry : gravityData.long2IntEntrySet()) {
+            GravityData data = GravityData.unpack(entry.getIntValue());
+            BlockPos center = BlockPos.of(entry.getLongKey());
+
+            if (contains(pos, center, data.getRadius())) {
+                regions.add(data);
+            }
+        }
+
+        return regions;
+    }
+
+
+    private static boolean contains(BlockPos pos, BlockPos center, float radius) {
+        float distanceSquared = ((center.getX() - pos.getX()) * (center.getX() - pos.getX())) + ((center.getY() - pos.getY()) * (center.getY() - pos.getY())) + ((center.getZ() - pos.getZ()) * (center.getZ() - pos.getZ()));
+        return distanceSquared <= radius * radius;
+    }
+
+    private static float defaultGravity (Level level) {
+        Planet planet = PlanetCache.getByDimensionOrNull(level.dimension());
+        if (planet == null) return GravityData.DEFAULT_GRAVITY;
+        return planet.gravity();
+    }
+
+    public static GravitySavedData get(ServerLevel level) {
+        return level.getDataStorage().computeIfAbsent(
+                new Factory<>(GravitySavedData::create, GravitySavedData::load),
+                NAME
+        );
+    }
+
+}

src/main/java/net/xevianlight/aphelion/core/saveddata/SpacePartitionSavedData.java

@@ -0,0 +1,185 @@
+package net.xevianlight.aphelion.core.saveddata;
+
+import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.saveddata.SavedData;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.core.saveddata.types.PartitionData;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class SpacePartitionSavedData extends SavedData {
+
+    private static final String NAME = "aphelion_station_partitions";
+
+    private final Long2ObjectMap<PartitionData> map = new Long2ObjectOpenHashMap<>();
+
+    public static SpacePartitionSavedData create() {
+        return new SpacePartitionSavedData();
+    }
+
+    public static SpacePartitionSavedData load(CompoundTag tag, HolderLookup.Provider lookupProvider) {
+        SpacePartitionSavedData data = create();
+
+        ListTag entries = tag.getList("Entries", CompoundTag.TAG_COMPOUND);
+        for (int i = 0; i < entries.size(); i++) {
+            CompoundTag e = entries.getCompound(i);
+
+            long key = e.getLong("Key");
+
+            ResourceLocation orbitRL = null;
+            if (e.contains("Orbit", CompoundTag.TAG_STRING)) {
+                orbitRL = ResourceLocation.tryParse(e.getString("Orbit"));
+            }
+
+            PartitionData pd = new PartitionData(orbitRL);
+
+            // Destination (optional)
+            if (e.contains("Destination", CompoundTag.TAG_STRING)) {
+                ResourceLocation destRL = ResourceLocation.tryParse(e.getString("Destination"));
+                pd.setDestination(destRL); // ok if null (parse fail)
+            } else {
+                pd.setDestination(null);
+            }
+
+            // Traveling (optional; default false)
+            if (e.contains("Traveling", CompoundTag.TAG_BYTE)) {
+                pd.setTraveling(e.getBoolean("Traveling"));
+            }
+
+            // Distances (optional; default 0.0)
+            if (e.contains("DistanceTraveled", CompoundTag.TAG_DOUBLE)) {
+                pd.setDistanceTraveled(e.getDouble("DistanceTraveled"));
+            }
+            if (e.contains("DistanceToDest", CompoundTag.TAG_DOUBLE)) {
+                pd.setDistanceToDest(e.getDouble("DistanceToDest"));
+            }
+
+            data.map.put(key, pd);
+        }
+
+        return data;
+    }
+
+    @Override
+    public @NotNull CompoundTag save(CompoundTag tag, HolderLookup.@NotNull Provider registries) {
+        ListTag entries = new ListTag();
+
+        map.long2ObjectEntrySet().forEach(entry -> {
+            long key = entry.getLongKey();
+            PartitionData pd = entry.getValue();
+
+            CompoundTag e = new CompoundTag();
+            e.putLong("Key", key);
+
+            // Orbit
+            if (pd.getOrbit() != null) {
+                e.putString("Orbit", pd.getOrbit().toString());
+            }
+
+            // Destination (only if present)
+            if (pd.getDestination() != null) {
+                e.putString("Destination", pd.getDestination().toString());
+            }
+
+            // Traveling + distances
+            e.putBoolean("Traveling", pd.isTraveling());
+
+            e.putDouble("DistanceTraveled", pd.getDistanceTraveled());
+            e.putDouble("DistanceToDest", pd.getDistanceToDest());
+
+            entries.add(e);
+        });
+
+        tag.put("Entries", entries);
+        return tag;
+    }
+
+
+    public @Nullable ResourceLocation getOrbitForPartition(int px, int pz) {
+        PartitionData data = map.get(pack(px, pz));
+        if (data == null) return null;
+        return map.get(pack(px, pz)).getOrbit();
+    }
+
+    public void setOrbitForPartition(int px, int pz, ResourceLocation orbit) {
+        long key = pack(px, pz);
+        PartitionData prev = map.get(key);
+        PartitionData newData = new PartitionData(prev);
+        newData.setOrbit(orbit);
+        if (!newData.equals(prev)) {
+            map.put(key, newData);
+            setDirty();
+        }
+    }
+
+    public boolean clearOrbitForPartition(int px, int pz) {
+        long key = pack(px, pz);
+        PartitionData removed = map.remove(key);
+        if (removed != null) {
+            setDirty();
+            return true;
+        }
+        return false;
+    }
+
+
+
+    public void clearAllOrbits() {
+        if (!map.isEmpty()) {
+            map.clear();
+            setDirty();
+        }
+    }
+
+    public @Nullable PartitionData getData(int px, int pz) {
+        long key = pack(px, pz);
+        PartitionData data = map.get(key);
+        if (data == null) {
+            // pick a sensible default orbit, or null if you truly allow it
+            data = new PartitionData(Aphelion.id("orbit/default"));
+            map.put(key, data);
+            setDirty();
+        }
+        return data;
+    }
+
+    public void overwriteAllExistingOrbits(ResourceLocation orbit) {
+        if (map.isEmpty()) return;
+
+        boolean changed = false;
+        for (var entry : map.long2ObjectEntrySet()) {
+            if(!orbit.equals(entry.getValue())) {
+                entry.getValue().setOrbit(orbit);
+                changed = true;
+            }
+        }
+
+        if (changed) setDirty();
+    }
+
+    public static SpacePartitionSavedData get(ServerLevel level) {
+        return level.getDataStorage().computeIfAbsent(
+                new Factory<>(SpacePartitionSavedData::create, SpacePartitionSavedData::load),
+                NAME
+        );
+    }
+
+    public static long pack(int px, int pz) {
+        return (((long) px) << 32) | (pz & 0xffffffffL);
+    }
+
+    public static int unpackX(long key) {
+        return (int)(key >> 32);
+    }
+
+    public static int unpackZ(long key) {
+        return (int)key;
+    }
+
+}

src/main/java/net/xevianlight/aphelion/core/saveddata/types/EnvironmentData.java

@@ -0,0 +1,97 @@
+package net.xevianlight.aphelion.core.saveddata.types;
+
+public record EnvironmentData (boolean oxygen, short temperature, float gravity){
+
+
+
+    public static final boolean DEFAULT_OXYGEN = true;
+    public static final short DEFAULT_TEMPERATURE = (short) 294.2611; // 70F
+    public static final float DEFAULT_GRAVITY = 9.80665f; // 1G
+
+    public static final int DEFAULT_PACKED = new EnvironmentData(DEFAULT_OXYGEN, DEFAULT_TEMPERATURE, DEFAULT_GRAVITY).pack();
+
+    /* We can pack all of this into an int value per block position.
+     * If we have to store partitionData for an entire chunk section (16^3), this amounts to 16kB per section.
+     * 1000 sections touched is 16MB
+     * This is acceptable for partitionData that will only exist where it is not equal to the default values
+     */
+
+    private static final int OXYGEN_BITS = 1; // Boolean. Do we have oxygen or no?
+    private static final int TEMPERATURE_BITS = Short.SIZE; // 16 bits should suffice for temperature, gives 0k to 65536k range, more than enough
+    private static final int GRAVITY_BITS = 15; // Leftover bits can be assigned to gravity, 32768 values
+
+    private static final float GRAVITY_PRECISION = 100.0f; // 2 decimal precision
+
+    private static final int OXYGEN_BIT = 0;
+    private static final int TEMPERATURE_BIT = OXYGEN_BIT + OXYGEN_BITS; // next 16 bits
+    private static final int GRAVITY_BIT = TEMPERATURE_BIT + TEMPERATURE_BITS; // next 15 bits
+
+
+    public EnvironmentData(boolean oxygen, short temperature, float gravity) {
+        this.oxygen = oxygen;
+        this.temperature = temperature;
+        this.gravity = gravity;
+    }
+
+    public EnvironmentData withOxygen(boolean newOxygen) {
+        return new EnvironmentData(newOxygen, this.temperature, this.gravity);
+    }
+
+    public EnvironmentData withTemperature(short newTemperature) {
+        return new EnvironmentData(this.oxygen, newTemperature, this.gravity);
+    }
+
+    @Deprecated
+    public EnvironmentData withGravity(float newGravity) {
+        return new EnvironmentData(this.oxygen, this.temperature, newGravity);
+    }
+
+    public int pack() {
+        int packedData = 0;
+
+        packedData |= (this.oxygen ? 1 : 0) << OXYGEN_BIT;
+        packedData |= (this.temperature & ((1 << TEMPERATURE_BITS) - 1)) << TEMPERATURE_BIT;
+        packedData |= (int) (this.gravity * GRAVITY_PRECISION) << GRAVITY_BIT;
+
+        return packedData;
+    }
+
+    public static EnvironmentData unpack(int packedData) {
+        boolean oxygen = ((packedData >> OXYGEN_BIT) & 1) == 1;
+        short temperature = (short) ((packedData >> TEMPERATURE_BIT) & ((1 << TEMPERATURE_BITS) - 1));
+        float gravity = ((packedData >> GRAVITY_BIT) & ((1 << GRAVITY_BITS) - 1)) / GRAVITY_PRECISION;
+
+        return new EnvironmentData(oxygen, temperature, gravity);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (obj == null || obj.getClass() != this.getClass()) return false;
+        var that = (EnvironmentData) obj;
+        return this.oxygen == that.oxygen &&
+                this.temperature == that.temperature &&
+                Float.floatToIntBits(this.gravity) == Float.floatToIntBits(that.gravity);
+    }
+
+    @Override
+    public String toString() {
+        return "EnvironmentData[" +
+                "oxygen=" + oxygen + ", " +
+                "temperature=" + temperature + ", " +
+                "gravity=" + gravity + ']';
+    }
+
+    public boolean hasOxygen() {
+        return oxygen;
+    }
+
+    public short getTemperature() {
+        return temperature;
+    }
+
+    public float getGravity() {
+        return gravity;
+    }
+
+}

src/main/java/net/xevianlight/aphelion/core/saveddata/types/GravityData.java

@@ -0,0 +1,39 @@
+package net.xevianlight.aphelion.core.saveddata.types;
+
+// A record seems more useful here since this class is really only to help us interpret these values as they are written to the disk as an integer.
+// We never store GravityData for any reason other than to test its values or to pack it into an integer.
+public record GravityData (float gravity, float radius) {
+
+    public static final float DEFAULT_GRAVITY = 32.00f; // Vanilla acceleration
+    public static final float GRAVITY_PRECISION = 100.0f;
+    public static final float RADIUS_PRECISION = 100.0f;
+    public static final float MAX_RADIUS = Short.MAX_VALUE / RADIUS_PRECISION;
+    public static final float MAX_GRAVITY = Short.MAX_VALUE / GRAVITY_PRECISION;
+
+    public GravityData {
+        gravity = Math.clamp(gravity, 0f, MAX_GRAVITY);
+        radius  = Math.clamp(radius,  0f, MAX_RADIUS);
+    }
+
+    public int pack() {
+        int g = Math.round(gravity * GRAVITY_PRECISION) & 0xFFFF;
+        int r = Math.round(radius * RADIUS_PRECISION) & 0xFFFF;
+
+        return g | (r << 16);
+    }
+
+    public float getGravity() {
+        return gravity;
+    }
+
+    public float getRadius() {
+        return radius;
+    }
+
+    public static GravityData unpack(int packed) {
+        float gravity = (packed & 0xFFFF) / GRAVITY_PRECISION;
+        float radius = ((packed >>> 16) & 0xFFFF) / RADIUS_PRECISION;
+
+        return new GravityData(gravity, radius);
+    }
+}

src/main/java/net/xevianlight/aphelion/core/saveddata/types/PartitionData.java

@@ -0,0 +1,121 @@
+package net.xevianlight.aphelion.core.saveddata.types;
+
+import io.netty.buffer.ByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.Optional;
+
+public class PartitionData {
+    @Nullable private ResourceLocation orbit;
+    @Nullable private ResourceLocation destination;
+    private boolean traveling;
+    private double distanceTraveled;
+    private double distanceToDest;
+
+    public PartitionData(@Nullable ResourceLocation orbit) {
+        this.orbit = orbit;
+        this.destination = null;
+        this.traveling = false;
+        this.distanceTraveled = 0;
+        this.distanceToDest = 0;
+    }
+
+    public PartitionData(PartitionData other) {
+        this.orbit = other.orbit;
+        this.destination = other.destination;
+        this.traveling = other.traveling;
+        this.distanceTraveled = other.distanceTraveled;
+        this.distanceToDest = other.distanceToDest;
+    }
+
+    public static final StreamCodec<ByteBuf, PartitionData> STREAM_CODEC =
+            StreamCodec.composite(
+                    // orbit is nullable -> optional codec
+                    ByteBufCodecs.optional(ResourceLocation.STREAM_CODEC),
+                    d -> Optional.ofNullable(d.getOrbit()),
+
+                    ByteBufCodecs.optional(ResourceLocation.STREAM_CODEC),
+                    d -> Optional.ofNullable(d.getDestination()),
+
+                    ByteBufCodecs.BOOL,
+                    PartitionData::isTraveling,
+
+                    // doubles -> DOUBLE codec
+                    ByteBufCodecs.DOUBLE,
+                    PartitionData::getDistanceTraveled,
+
+                    ByteBufCodecs.DOUBLE,
+                    PartitionData::getDistanceToDest,
+
+                    (orbitOpt, destOpt, traveling, distTraveled, distToDest) -> {
+                        PartitionData data = new PartitionData(orbitOpt.orElse(null));
+                        data.destination = destOpt.orElse(null);
+                        data.traveling = traveling;
+                        data.distanceTraveled = distTraveled;
+                        data.distanceToDest = distToDest;
+                        return data;
+                    }
+            );
+
+    public @Nullable ResourceLocation getOrbit() {
+        return this.orbit;
+    }
+
+    public void setOrbit(ResourceLocation orbit) {
+        this.orbit = orbit;
+    }
+
+    public @Nullable ResourceLocation getDestination() {
+        return destination;
+    }
+
+    public void setDestination(@Nullable ResourceLocation destination) {
+        this.destination = destination;
+    }
+
+    public boolean isTraveling() {
+        return traveling;
+    }
+
+    public void setTraveling(boolean traveling) {
+        this.traveling = traveling;
+    }
+
+    public double getDistanceTraveled() {
+        return distanceTraveled;
+    }
+
+    public void setDistanceTraveled(double distanceTraveled) {
+        this.distanceTraveled = distanceTraveled;
+    }
+
+    public double getDistanceToDest() {
+        return distanceToDest;
+    }
+
+    public void setDistanceToDest(double distanceToDest) {
+        this.distanceToDest = distanceToDest;
+    }
+
+    public void travel(double distance) {
+        distanceTraveled = Math.min( distanceTraveled + distance, distanceToDest);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || obj.getClass() != this.getClass()) return false;
+
+        PartitionData that = (PartitionData) obj;
+
+        return Objects.equals(this.orbit, that.orbit)
+                && Objects.equals(this.destination, that.destination)
+                && this.traveling == that.traveling
+                && Double.compare(this.distanceTraveled, that.distanceTraveled) == 0
+                && Double.compare(this.distanceToDest, that.distanceToDest) == 0;
+    }
+}

src/main/java/net/xevianlight/aphelion/core/space/SpacePartitionSavedData.java

@@ -1,121 +0,0 @@
-package net.xevianlight.aphelion.core.space;
-
-import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
-import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
-import net.minecraft.core.HolderLookup;
-import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.ListTag;
-import net.minecraft.nbt.Tag;
-import net.minecraft.resources.ResourceLocation;
-import net.minecraft.server.level.ServerLevel;
-import net.minecraft.world.level.saveddata.SavedData;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.File;
-
-public class SpacePartitionSavedData extends SavedData {
-
-    private static final String NAME = "aphelion_station_partitions";
-
-    private final Long2ObjectMap<ResourceLocation> map = new Long2ObjectOpenHashMap<>();
-
-    public static SpacePartitionSavedData create() {
-        return new SpacePartitionSavedData();
-    }
-
-    public static SpacePartitionSavedData load(CompoundTag tag, HolderLookup.Provider lookupProvider) {
-        SpacePartitionSavedData data = create();
-
-        ListTag entires = tag.getList("Entries", CompoundTag.TAG_COMPOUND);
-        for (int i = 0; i < entires.size(); i++) {
-            CompoundTag e = entires.getCompound(i);
-            long key = e.getLong("Key");
-            String orbit = e.getString("Orbit"); // "aphelion/mars"
-            ResourceLocation orbitRL = ResourceLocation.tryParse(orbit);
-            if (orbitRL != null)
-                data.map.put(key, orbitRL);
-        }
-
-        return data;
-    }
-
-    @Override
-    public CompoundTag save(CompoundTag tag, HolderLookup.Provider registries) {
-        ListTag entries = new ListTag();
-
-        map.long2ObjectEntrySet().forEach(entry -> {
-            CompoundTag e = new CompoundTag();
-            e.putLong("Key", entry.getLongKey());
-            e.putString("Orbit", entry.getValue().toString());
-            entries.add(e);
-        });
-
-        tag.put("Entries", entries);
-        return tag;
-    }
-
-    public @Nullable ResourceLocation getOrbitForPartition(int px, int pz) {
-        return map.get(pack(px, pz));
-    }
-
-    public void setOrbitForPartition(int px, int pz, ResourceLocation orbit) {
-        long key = pack(px, pz);
-        ResourceLocation prev = map.get(key);
-        if (!orbit.equals(prev)) {
-            map.put(key, orbit);
-            setDirty();
-        }
-    }
-
-    public boolean clearOrbitForPartition(int px, int pz) {
-        long key = pack(px, pz);
-        ResourceLocation removed = map.remove(key);
-        if (removed != null) {
-            setDirty();;
-            return true;
-        }
-        return false;
-    }
-
-    public void clearAllOrbits() {
-        if (!map.isEmpty()) {
-            map.clear();
-            setDirty();
-        }
-    }
-
-    public void overwriteAllExistingOrbits(ResourceLocation orbit) {
-        if (map.isEmpty()) return;
-
-        boolean changed = false;
-        for (var entry : map.long2ObjectEntrySet()) {
-            if(!orbit.equals(entry.getValue())) {
-                entry.setValue(orbit);
-                changed = true;
-            }
-        }
-
-        if (changed) setDirty();
-    }
-
-    public static SpacePartitionSavedData get(ServerLevel level) {
-        return level.getDataStorage().computeIfAbsent(
-                new Factory<>(SpacePartitionSavedData::create, SpacePartitionSavedData::load),
-                NAME
-        );
-    }
-
-    public static long pack(int px, int pz) {
-        return (((long) px) << 32) | (pz & 0xffffffffL);
-    }
-
-    public static int unpackX(long key) {
-        return (int)(key >> 32);
-    }
-
-    public static int unpackZ(long key) {
-        return (int)key;
-    }
-
-}

src/main/java/net/xevianlight/aphelion/datagen/ModBlockLootTableProvider.java

@@ -25,6 +25,8 @@ public class ModBlockLootTableProvider extends BlockLootSubProvider {
         dropSelf(ModBlocks.VACUUM_ARC_FURNACE_CONTROLLER.get());
         dropSelf(ModBlocks.OXYGEN_TEST_BLOCK.get());
         dropOther(ModBlocks.VAF_MULTIBLOCK_DUMMY_BLOCK.get(), ItemStack.EMPTY.getItem());
+        dropSelf(ModBlocks.LAUNCH_PAD.get());
+        dropSelf(ModBlocks.ROCKET_ASSEMBLER_BLOCK.get());
     }
 
     @Override

src/main/java/net/xevianlight/aphelion/datagen/ModBlockStateProvider.java

@@ -25,8 +25,18 @@ public class ModBlockStateProvider extends BlockStateProvider {
         blockItem(ModBlocks.ELECTRIC_ARC_FURNACE);
         blockItem(ModBlocks.VACUUM_ARC_FURNACE_CONTROLLER);
 
+//        horizontalBlock(ModBlocks.ROCKET_ASSEMBLER_BLOCK.get(), models().orientable("aphelion:rocket_assembler_block",
+//                modLoc("block/test_block"),
+//                mcLoc("block/furnace_front"),
+//                modLoc("block/test_block")));
+        blockItem(ModBlocks.ROCKET_ASSEMBLER_BLOCK);
+
         blockWithItem(ModBlocks.BLOCK_STEEL);
         blockWithItem(ModBlocks.DIMENSION_CHANGER);
+
+//        this is already defined ourselves
+//        blockItem(ModBlocks.LAUNCH_PAD);
+
         blockItem(ModBlocks.ARC_FURNACE_CASING_BLOCK);
         blockWithItem(ModBlocks.OXYGEN_TEST_BLOCK);
     }

src/main/java/net/xevianlight/aphelion/datagen/ModBlockTagProvider.java

@@ -40,5 +40,9 @@ public class ModBlockTagProvider extends BlockTagsProvider {
 
         tag(ModTags.Blocks.STORAGE_BLOCKS)
                 .add(ModBlocks.BLOCK_STEEL.get());
+
+        tag(ModTags.Blocks.LAUNCH_PAD)
+                .add(ModBlocks.LAUNCH_PAD.get());
+
     }
 }

src/main/java/net/xevianlight/aphelion/entites/vehicles/RocketEngineSound.java

@@ -0,0 +1,42 @@
+package net.xevianlight.aphelion.entites.vehicles;
+
+import net.minecraft.client.resources.sounds.AbstractTickableSoundInstance;
+import net.minecraft.client.resources.sounds.SoundInstance;
+import net.minecraft.sounds.SoundSource;
+import net.xevianlight.aphelion.core.init.ModSounds;
+
+public class RocketEngineSound extends AbstractTickableSoundInstance {
+    private final RocketEntity rocket;
+
+    public RocketEngineSound (RocketEntity rocket) {
+        super(ModSounds.ROCKET_ENGINE.get(), SoundSource.AMBIENT, SoundInstance.createUnseededRandom());
+        this.rocket = rocket;
+
+        this.looping = true;
+        this.delay = 0;
+        this.volume = 1;
+        this.pitch = 1.0f;
+
+        this.x = rocket.getX();
+        this.y = rocket.getY();
+        this.z = rocket.getZ();
+    }
+
+    @Override
+    public void tick() {
+        if (rocket.isRemoved() || rocket.getPhase() != RocketEntity.FlightPhase.ASCEND) {
+            this.stop();
+            return;
+        }
+
+        // follow entity
+        this.x = rocket.getX();
+        this.y = rocket.getY();
+        this.z = rocket.getZ();
+    }
+
+    public void killSound() {
+        stop();
+    }
+
+}

src/main/java/net/xevianlight/aphelion/entites/vehicles/RocketEntity.java

@@ -1,5 +1,6 @@
 package net.xevianlight.aphelion.entites.vehicles;
 
+import net.minecraft.client.Minecraft;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.nbt.CompoundTag;
@@ -10,7 +11,6 @@ import net.minecraft.network.syncher.EntityDataSerializers;
 import net.minecraft.network.syncher.SynchedEntityData;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.server.level.ColumnPos;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.InteractionHand;
@@ -29,14 +29,12 @@ import net.minecraft.world.phys.Vec3;
 import net.neoforged.neoforge.entity.IEntityWithComplexSpawn;
 import net.neoforged.neoforge.fluids.FluidType;
 import net.xevianlight.aphelion.Aphelion;
-import net.xevianlight.aphelion.core.KeyVariables;
 import net.xevianlight.aphelion.core.init.ModEntities;
 import net.xevianlight.aphelion.util.RocketStructure;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
-import java.util.Objects;
 
 public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpawn {
 
@@ -53,12 +51,11 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
     private double landingPosX;
     private double landingPosZ;
 
-    private static final double TELEPORT_Y = 600.0;
-    private static final double ASCEND_ACCEL = 0.05;
-    private static final double DESCEND_SPEED = 2;
+    private static final double TELEPORT_Y = 1000.0;
+    private static final double ASCEND_ACCEL = 0.0125;
+    private static final double DESCEND_SPEED = 1;
 
     private double yVel = 0.0;
-    private boolean jumpWasDown = false;
 
     private static final EntityDataAccessor<Byte> FLIGHT_PHASE =
             SynchedEntityData.defineId(RocketEntity.class, EntityDataSerializers.BYTE);
@@ -101,18 +98,6 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
         setPhase(FlightPhase.PREPARE);
     }
 
-    public Player getFirstPlayerPassenger() {
-        if (!this.getPassengers().isEmpty()) {
-            for (int i = 0; i < this.getPassengers().size(); i++) {
-                if (this.getPassengers().get(i) instanceof Player player) {
-                    return player;
-                }
-            }
-        }
-
-        return null;
-    }
-
     @Override
     public void tick() {
         super.tick();
@@ -146,11 +131,6 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
     }
 
     private void tickPrepare() {
-//        if (targetDim == this.level().dimension()) {
-//            setPhase(FlightPhase.IDLE);
-//            Aphelion.LOGGER.info("Target dimension matches current dimension");
-//            return;
-//        }
         setPhase(FlightPhase.ASCEND);
     }
 
@@ -189,10 +169,6 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
             landingPosZ = getZ();
         }
 
-        // Compute landing Y in destination
-        int hx = (int) Math.floor(landingPosX);
-        int hz = (int) Math.floor(landingPosZ);
-
         double arrivalY = TELEPORT_Y;
 
         var passengers = List.copyOf(getPassengers());
@@ -326,26 +302,24 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
         }
     }
 
+    private RocketEngineSound ascendLoopSound;
+
     private void handleClientFlightPhaseChange(FlightPhase phase) {
         switch (phase) {
-            case IDLE -> {
-//                var x = 0;
-            }
-            case PREPARE -> {
-//                var x = 1;
+            case IDLE, PREPARE, TRANSIT, DESCEND, LANDED -> {
+                    Aphelion.LOGGER.info("Rocket state updated to {}", phase);
+                if (ascendLoopSound != null) {
+                    ascendLoopSound.killSound();
+                    ascendLoopSound = null;
+                }
             }
             case ASCEND -> {
-//                var x = 2;
-            }
-            case TRANSIT -> {
-//                var x = 3;
-            }
-            case DESCEND -> {
-//                var x = 4;
-            }
-            case LANDED -> {
-//                var x = 5;
+                if (ascendLoopSound == null || ascendLoopSound.isStopped()) {
+                    ascendLoopSound = new RocketEngineSound(this);
+                    Minecraft.getInstance().getSoundManager().play(ascendLoopSound);
+                }
             }
+
         }
     }
 
@@ -382,6 +356,7 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
 
         landingPosX = tag.getDouble("LandingX");
         landingPosZ = tag.getDouble("LandingZ");
+        yVel = tag.getDouble("yVelocity");
 
         if (tag.contains("FlightPhase", Tag.TAG_BYTE)) {
             setPhase(FlightPhase.values()[tag.getByte("FlightPhase")]);
@@ -399,9 +374,10 @@ public class RocketEntity extends VehicleEntity implements IEntityWithComplexSpa
 
         tag.putDouble("LandingX", landingPosX);
         tag.putDouble("LandingZ", landingPosZ);
+        tag.putDouble("yVelocity", yVel);
     }
 
-    public BlockPos getTargetPos() {
+    public @Nullable BlockPos getTargetPos() {
         return targetPos;
     }
 

src/main/java/net/xevianlight/aphelion/event/ModBusEvents.java

@@ -5,19 +5,17 @@ import net.neoforged.fml.common.EventBusSubscriber;
 import net.neoforged.neoforge.capabilities.Capabilities;
 import net.neoforged.neoforge.capabilities.RegisterCapabilitiesEvent;
 import net.neoforged.neoforge.network.event.RegisterPayloadHandlersEvent;
-import net.neoforged.neoforge.network.handlers.ClientPayloadHandler;
 import net.neoforged.neoforge.network.registration.HandlerThread;
 import net.neoforged.neoforge.network.registration.PayloadRegistrar;
 import net.xevianlight.aphelion.Aphelion;
 import net.xevianlight.aphelion.block.dummy.entity.BaseMultiblockDummyBlockEntity;
-import net.xevianlight.aphelion.block.dummy.entity.VAFMultiblockDummyBlockEntity;
 import net.xevianlight.aphelion.block.entity.custom.ElectricArcFurnaceEntity;
 import net.xevianlight.aphelion.block.entity.custom.TestBlockEntity;
 import net.xevianlight.aphelion.block.entity.custom.VacuumArcFurnaceControllerEntity;
 import net.xevianlight.aphelion.core.init.ModBlockEntities;
 import net.xevianlight.aphelion.network.RocketPayloadHandlers;
-import net.xevianlight.aphelion.network.ServerPayloadHandler;
-import net.xevianlight.aphelion.network.packet.PartitionData;
+import net.xevianlight.aphelion.network.PartitionPayloadHandler;
+import net.xevianlight.aphelion.network.packet.PartitionPayload;
 import net.xevianlight.aphelion.network.packet.RocketLaunchPayload;
 
 @EventBusSubscriber(modid = Aphelion.MOD_ID)
@@ -40,9 +38,9 @@ public class ModBusEvents {
                 .executesOn(HandlerThread.MAIN);
 
         registrar.playToClient(
-                PartitionData.TYPE,
-                PartitionData.STREAM_CODEC,
-                ServerPayloadHandler::handleDataOnMain
+                PartitionPayload.TYPE,
+                PartitionPayload.STREAM_CODEC,
+                PartitionPayloadHandler::handleDataOnMain
         );
 
         registrar.playToServer(

src/main/java/net/xevianlight/aphelion/mixins/common/LivingEntityMixin.java

@@ -0,0 +1,29 @@
+package net.xevianlight.aphelion.mixins.common;
+
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.level.Level;
+import net.xevianlight.aphelion.systems.OxygenService;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+//
+@Mixin(LivingEntity.class)
+public abstract class LivingEntityMixin extends Entity {
+
+    public LivingEntityMixin(EntityType<?> type, Level level) { super(type, level); }
+
+    @Inject(method= "tick", at = @At("TAIL"))
+    public void aphelion$tick(CallbackInfo ci) {
+        if ((level() instanceof ServerLevel level)) {
+            LivingEntity entity = (LivingEntity) (Object) this;
+
+            // Oxygen system
+            OxygenService.entityTick(level, entity);
+        }
+    }
+}

src/main/java/net/xevianlight/aphelion/network/KeyNetwork.java

@@ -22,6 +22,8 @@ public final class KeyNetwork {
 
         // consumeClick makes it fire once per press, not every tick held
         if (AphelionClient.ROCKET_LAUNCH_KEY.consumeClick() && mc.player.getVehicle() instanceof RocketEntity rocket) {
+
+            // Send a packet to the server telling it to try launching the rocket matching this id. The packet only contains the rocketId as an integer.
             PacketDistributor.sendToServer(new RocketLaunchPayload(rocket.getId()));
         }
     }

src/main/java/net/xevianlight/aphelion/network/PartitionPayloadHandler.java

@@ -3,13 +3,14 @@ package net.xevianlight.aphelion.network;
 import net.neoforged.neoforge.network.handling.IPayloadContext;
 import net.xevianlight.aphelion.Aphelion;
 import net.xevianlight.aphelion.client.PartitionClientState;
-import net.xevianlight.aphelion.network.packet.PartitionData;
+import net.xevianlight.aphelion.network.packet.PartitionPayload;
 
 // Handle packets TO the client FROM the server
-public class ServerPayloadHandler {
+public class PartitionPayloadHandler {
 
-    public static void handleDataOnMain(PartitionData data, IPayloadContext context) {
+    public static void handleDataOnMain(PartitionPayload data, IPayloadContext context) {
+        // Set our local partition state to the packet we just received.
         PartitionClientState.set(data);
-        Aphelion.LOGGER.info("Partition packet received! id={}", data.id());
+        Aphelion.LOGGER.info("Partition packet received! id={}", data.partitionData());
     }
 }

src/main/java/net/xevianlight/aphelion/network/PartitionSync.java

@@ -4,33 +4,21 @@ package net.xevianlight.aphelion.network;
 import net.minecraft.server.level.ServerPlayer;
 import net.neoforged.bus.api.SubscribeEvent;
 import net.neoforged.fml.common.EventBusSubscriber;
-import net.neoforged.neoforge.event.entity.player.PlayerEvent;
 import net.neoforged.neoforge.event.tick.ServerTickEvent;
 import net.neoforged.neoforge.network.PacketDistributor;
 import net.xevianlight.aphelion.Aphelion;
-import net.xevianlight.aphelion.core.space.SpacePartitionSavedData;
-import net.xevianlight.aphelion.network.packet.PartitionData;
+import net.xevianlight.aphelion.core.saveddata.SpacePartitionSavedData;
+import net.xevianlight.aphelion.core.saveddata.types.PartitionData;
+import net.xevianlight.aphelion.network.packet.PartitionPayload;
 import net.xevianlight.aphelion.util.SpacePartitionHelper;
 
-import java.util.HashSet;
-import java.util.Objects;
-import java.util.Set;
 import java.util.UUID;
 
 @EventBusSubscriber(modid = Aphelion.MOD_ID)
 public final class PartitionSync {
 
-    // send once right after join (safe: delayed to next server tick)
-    private static final Set<UUID> PENDING_JOIN_SEND = new HashSet<>();
-
-    @SubscribeEvent
-    public static void onLogin(PlayerEvent.PlayerLoggedInEvent e) {
-        if (e.getEntity() instanceof ServerPlayer sp) {
-            PENDING_JOIN_SEND.add(sp.getUUID());
-        }
-    }
-
-    private static final java.util.Map<UUID, PartitionData> LAST_SENT = new java.util.HashMap<>();
+    // Stora all packets we send to all players in a map so we can look it up later
+    private static final java.util.Map<UUID, PartitionPayload> LAST_SENT = new java.util.HashMap<>();
 
     @SubscribeEvent
     public static void onServerTick(ServerTickEvent.Post e) {
@@ -39,24 +27,29 @@ public final class PartitionSync {
 //        Aphelion.LOGGER.info("WORKS!!!");
 
         for (ServerPlayer sp : server.getPlayerList().getPlayers()) {
-            PartitionData now = computePartitionFor(sp); // your logic
-            PartitionData prev = LAST_SENT.get(sp.getUUID());
 
+            // Prepare a new packet and compare it with the last one we sent the player
+            PartitionPayload now = computePartitionFor(sp);
+            PartitionPayload prev = LAST_SENT.get(sp.getUUID());
+
+            // If it is different, send them the new one
             if (prev == null || !prev.equals(now)) {
                 PacketDistributor.sendToPlayer(sp, now);
+                // Store this packet for later
                 LAST_SENT.put(sp.getUUID(), now);
             }
         }
     }
 
-    private static PartitionData computePartitionFor(ServerPlayer sp) {
-        // Example: convert player position to partition coords
+    private static PartitionPayload computePartitionFor(ServerPlayer sp) {
         int px = (int)Math.floor(sp.getX() / SpacePartitionHelper.SIZE);
         int pz = (int)Math.floor(sp.getZ() / SpacePartitionHelper.SIZE);
 
-        var orbit = SpacePartitionSavedData.get(sp.serverLevel()).getOrbitForPartition(px, pz);
-        String orbitId = (orbit != null) ? orbit.toString() : "aphelion:orbit/default";
+        PartitionData live = SpacePartitionSavedData.get(sp.serverLevel()).getData(px, pz);
 
-        return new PartitionData(orbitId);
+        // snapshot so mutations later don’t affect cached payloads
+        PartitionData snapshot = (live == null) ? null : new PartitionData(live);
+
+        return new PartitionPayload(snapshot);
     }
 }

src/main/java/net/xevianlight/aphelion/network/packet/PartitionData.java

@@ -1,24 +0,0 @@
-package net.xevianlight.aphelion.network.packet;
-
-import io.netty.buffer.ByteBuf;
-import net.minecraft.network.codec.ByteBufCodecs;
-import net.minecraft.network.codec.StreamCodec;
-import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
-import net.minecraft.resources.ResourceLocation;
-import net.xevianlight.aphelion.Aphelion;
-
-public record PartitionData (String id) implements CustomPacketPayload {
-    public static final Type<PartitionData> TYPE = new CustomPacketPayload.Type<>(ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, "partition_data"));
-
-    public static final StreamCodec<ByteBuf, PartitionData> STREAM_CODEC = StreamCodec.composite(
-            ByteBufCodecs.STRING_UTF8,
-            PartitionData::id,
-
-            PartitionData::new
-    );
-
-    @Override
-    public Type<? extends CustomPacketPayload> type() {
-        return TYPE;
-    }
-}

src/main/java/net/xevianlight/aphelion/network/packet/PartitionPayload.java

@@ -0,0 +1,39 @@
+package net.xevianlight.aphelion.network.packet;
+
+import io.netty.buffer.ByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+import net.minecraft.resources.ResourceLocation;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.core.saveddata.types.PartitionData;
+
+import java.util.Objects;
+
+public record PartitionPayload(PartitionData partitionData) implements CustomPacketPayload {
+    public static final Type<PartitionPayload> TYPE =
+            new Type<>(ResourceLocation.fromNamespaceAndPath(Aphelion.MOD_ID, "partition_data"));
+
+    public static final StreamCodec<ByteBuf, PartitionPayload> STREAM_CODEC =
+            StreamCodec.composite(
+                    PartitionData.STREAM_CODEC,
+                    PartitionPayload::partitionData,
+                    PartitionPayload::new
+            );
+
+    @Override
+    public Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == null || getClass() != o.getClass()) return false;
+        PartitionPayload that = (PartitionPayload) o;
+        return partitionData.equals(that.partitionData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(partitionData);
+    }
+}

src/main/java/net/xevianlight/aphelion/planet/Planet.java

@@ -10,12 +10,16 @@ import net.xevianlight.aphelion.util.registries.ModRegistries;
 public record Planet(
         ResourceKey<Level> dimension,
         double orbitDistance,
-        ResourceKey<StarSystem> system
+        ResourceKey<StarSystem> system,
+        boolean oxygen,
+        float gravity
 ) {
     public static final Codec<Planet> CODEC = RecordCodecBuilder.create(inst -> inst.group(
-        ResourceKey.codec(Registries.DIMENSION).fieldOf("dimension").forGetter(Planet::dimension),
-        Codec.DOUBLE.fieldOf("orbit_distance").forGetter(Planet::orbitDistance),
-        ResourceKey.codec(ModRegistries.STAR_SYSTEM).fieldOf("star_system").forGetter(Planet::system)
+            ResourceKey.codec(Registries.DIMENSION).fieldOf("dimension").forGetter(Planet::dimension),
+            Codec.DOUBLE.fieldOf("orbit_distance").forGetter(Planet::orbitDistance),
+            ResourceKey.codec(ModRegistries.STAR_SYSTEM).fieldOf("star_system").forGetter(Planet::system),
+            Codec.BOOL.fieldOf("oxygen").forGetter(Planet::oxygen),
+            Codec.FLOAT.fieldOf("gravity").forGetter(Planet::gravity)
 
     ).apply(inst, Planet::new));
 }

src/main/java/net/xevianlight/aphelion/planet/PlanetCache.java

@@ -18,7 +18,9 @@ public final class PlanetCache {
     public static final Planet DEFAULT = new Planet(
             ResourceKey.create(Registries.DIMENSION, ResourceLocation.withDefaultNamespace("overworld")),
             1,
-            ResourceKey.create(ModRegistries.STAR_SYSTEM, Aphelion.id("sol"))
+            ResourceKey.create(ModRegistries.STAR_SYSTEM, Aphelion.id("sol")),
+            true,
+            1
     );
 
     public static void registerPlanets(Map<ResourceLocation, Planet> planets) {

src/main/java/net/xevianlight/aphelion/planet/StarSystem.java

@@ -7,6 +7,6 @@ public record StarSystem(
         int temp
 ) {
     public static final Codec<StarSystem> CODEC = RecordCodecBuilder.create(inst -> inst.group(
-            Codec.INT.fieldOf("dimension").forGetter(StarSystem::temp)
+            Codec.INT.fieldOf("temp").forGetter(StarSystem::temp)
     ).apply(inst, StarSystem::new));
 }

src/main/java/net/xevianlight/aphelion/systems/OxygenService.java

@@ -0,0 +1,39 @@
+package net.xevianlight.aphelion.systems;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.level.Level;
+import net.xevianlight.aphelion.Aphelion;
+import net.xevianlight.aphelion.core.init.ModDamageSources;
+import net.xevianlight.aphelion.core.saveddata.EnvironmentSavedData;
+
+public class OxygenService {
+    public static boolean hasOxygen(Level level, BlockPos pos) {
+        if (level.isClientSide) {
+            // We can't pull oxygen data from the client side, so just, uhh, don't!
+            Aphelion.LOGGER.warn("Tried to get server oxygen data from client side!");
+            return false;
+        }
+        boolean positionHasOxygen = EnvironmentSavedData.get((ServerLevel) level).hasOxygen(level, pos);
+
+        return positionHasOxygen;
+    }
+
+    public static boolean hasOxygen(Entity entity) {
+        // Not sure if this is at the entity's feet, head, or the middle... research later
+        // Blockpos is from entity's feet ~Xev
+        BlockPos entityBlockPos = BlockPos.containing(entity.getX(), entity.getY(), entity.getZ());
+        return hasOxygen(entity.level(), entityBlockPos);
+    }
+
+    public static int OXYGEN_DAMAGE_TICK_AMT = 2;
+    public static int OXYGEN_DAMAGE_TICK_FREQ = 20;
+    /// Called by LivingEntity.entityTick mixin
+    public static void entityTick(ServerLevel level, LivingEntity entity) {
+        if (entity.tickCount % OXYGEN_DAMAGE_TICK_FREQ != 0) return;
+        if (hasOxygen(entity)) return;
+        entity.hurt(ModDamageSources.create(level, ModDamageSources.OXYGEN), OXYGEN_DAMAGE_TICK_AMT);
+    }
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/BasicItemExtractAttachment.java

@@ -0,0 +1,61 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.state.BlockState;
+import net.neoforged.neoforge.capabilities.BlockCapabilityCache;
+import net.neoforged.neoforge.capabilities.Capabilities;
+import net.neoforged.neoforge.items.IItemHandler;
+import net.xevianlight.aphelion.block.entity.custom.PipeTestBlockEntity;
+import org.jetbrains.annotations.Nullable;
+
+public class BasicItemExtractAttachment extends ConveyorAttachment implements ConveyorInput {
+
+    BlockCapabilityCache<IItemHandler, @Nullable Direction> capabilityCache;
+
+    public BasicItemExtractAttachment(ServerLevel level, BlockPos pos, Direction facingDirection) {
+        super(level, pos, facingDirection);
+
+        capabilityCache = BlockCapabilityCache.create(
+                Capabilities.ItemHandler.BLOCK,
+                level,
+                pos.relative(facingDirection),
+                facingDirection.getOpposite()
+        );
+    }
+
+    @Override
+    public void render() {
+
+    }
+
+    @Override
+    public void tick(ServerLevel level, BlockState state, BlockPos pos, Direction facingDirection, ConveyorNetwork network) {
+        // do an extract and distribute
+        IItemHandler container = capabilityCache.getCapability();
+        if (container == null) return;
+
+        final int EXTRACT_PER_TICK = 4;
+        int to_extract = EXTRACT_PER_TICK;
+
+        int extract_slot_id = container.getSlots() - 1;
+        while (extract_slot_id >= 0 && container.getStackInSlot(extract_slot_id).isEmpty()) extract_slot_id--;
+        if (extract_slot_id == -1) return;
+
+
+        // Do a simulated extract, then run through every output side on the graph and do real inserts.
+        // By the end, remove as many items as we successfully inserted with a real extract
+        ItemStack to_distribute = container.extractItem(extract_slot_id, to_extract, true);
+        int extracted_amount = to_distribute.getCount();
+
+        to_distribute = network.insertItem(to_distribute, false);
+
+        int distributed_amount = extracted_amount;
+        if (!to_distribute.isEmpty()) {
+            distributed_amount = extracted_amount - to_distribute.getCount();
+        }
+        container.extractItem(extract_slot_id, distributed_amount, false);
+    }
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/BasicItemOutput.java

@@ -0,0 +1,39 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.capabilities.BlockCapabilityCache;
+import net.neoforged.neoforge.capabilities.Capabilities;
+import net.neoforged.neoforge.items.IItemHandler;
+import org.jetbrains.annotations.Nullable;
+
+public class BasicItemOutput implements ConveyorOutput {
+    BlockCapabilityCache<IItemHandler, @Nullable Direction> capabilityCache;
+
+    public BasicItemOutput(ServerLevel level, BlockPos pos, Direction facingDirection) {
+        capabilityCache = BlockCapabilityCache.create(
+                Capabilities.ItemHandler.BLOCK,
+                level,
+                pos.relative(facingDirection),
+                facingDirection.getOpposite()
+        );
+    }
+
+    @Override
+    public ItemStack insertItem(ItemStack stack, boolean simulate) {
+        ItemStack toInsert = stack.copy();
+
+        IItemHandler container = capabilityCache.getCapability();
+        if (container == null) return toInsert;
+
+        for (int insertIndex = 0; insertIndex < container.getSlots(); insertIndex++) {
+            if (toInsert.isEmpty()) break;
+
+            toInsert = container.insertItem(insertIndex, toInsert, simulate);
+        }
+
+        return toInsert;
+    }
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/ConveyorAttachment.java

@@ -0,0 +1,16 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.block.state.BlockState;
+import net.xevianlight.aphelion.block.entity.custom.PipeTestBlockEntity;
+
+public class ConveyorAttachment {
+    ConveyorAttachment(ServerLevel level, BlockPos pos, Direction facingDirection) {}
+
+    //TODO: put in the right interface for a render function
+    void render() {};
+
+    public void tick(ServerLevel level, BlockState state, BlockPos pos, Direction facingDirection, ConveyorNetwork network) {}
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/ConveyorInput.java

@@ -0,0 +1,10 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.block.state.BlockState;
+
+public interface ConveyorInput {
+    void tick(ServerLevel level, BlockState state, BlockPos pos, Direction facingDirection, ConveyorNetwork graph);
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/ConveyorNetwork.java

@@ -0,0 +1,46 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.world.item.ItemStack;
+import net.xevianlight.aphelion.block.entity.custom.PipeTestBlockEntity;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+// I'm naming and structuring the conveyor stuff like this bc i kinda wanna try making a space-engineers
+// style request system later... though it might not be necessary, given that the reason it needs to be like that
+// in space engineers is mostly space constraints if i had to guess
+public class ConveyorNetwork {
+    boolean isInvalid = false;
+    public List<PipeTestBlockEntity> pipes = new ArrayList<>();
+    public Set<ConveyorOutput> outputs = new HashSet<>();
+
+    public ItemStack insertItem(ItemStack stack, boolean simulate) {
+        if (isInvalid) return stack;
+        for (ConveyorOutput output : outputs) {
+            stack = output.insertItem(stack, simulate);
+            if (stack.isEmpty()) break;
+        }
+        return stack;
+    }
+
+    public void addPipe(PipeTestBlockEntity pipe) {
+        pipes.add(pipe);
+        pipe.graph = this;
+        for (ConveyorOutput output : pipe.outputs.values()) {
+            if (output != null) this.outputs.add(output);
+        }
+    }
+
+    /// Called whenever a pipe is removed from a graph, or when a new graph comes across an old one.
+    public void invalidate() {
+        for (PipeTestBlockEntity pipe : pipes) {
+            pipe.graph = null;
+            for (ConveyorOutput output : pipe.outputs.values()) {
+                if (output != null) this.outputs.remove(output);
+            }
+        }
+        this.isInvalid = true;
+    }
+}

src/main/java/net/xevianlight/aphelion/systems/conveyor/ConveyorOutput.java

@@ -0,0 +1,8 @@
+package net.xevianlight.aphelion.systems.conveyor;
+
+import net.minecraft.world.item.ItemStack;
+
+public interface ConveyorOutput {
+    /// @return Rejected items
+    ItemStack insertItem(ItemStack stack, boolean simulate);
+}

src/main/java/net/xevianlight/aphelion/util/FloodFill3D.java

@@ -0,0 +1,114 @@
+package net.xevianlight.aphelion.util;
+
+import it.unimi.dsi.fastutil.longs.LongArrayFIFOQueue;
+import it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet;
+import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
+import it.unimi.dsi.fastutil.longs.LongSet;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.phys.AABB;
+import net.minecraft.world.phys.shapes.CollisionContext;
+import net.minecraft.world.phys.shapes.VoxelShape;
+
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+public final class FloodFill3D {
+
+    private static final Direction[] DIRECTIONS = Direction.values();
+
+    public static final SolidBlockPredicate TEST_FULL_SEAL = (level, pos, state, positions, queue, direction) -> {
+        if (state.isAir()) return true;
+        if (state.is(ModTags.Blocks.PASSES_FLOOD_FILL)) return true;
+        if (state.is(ModTags.Blocks.BLOCKS_FLOOD_FILL)) return false;
+        if (state.isCollisionShapeFullBlock(level, pos)) return false;
+
+        VoxelShape collisionShape = state.getCollisionShape(level, pos);
+
+        if (collisionShape.isEmpty()) return true;
+        if (!isSideSolid(collisionShape, direction)) return true;
+        if (!isFaceSturdy(collisionShape, direction) && !isFaceSturdy(collisionShape, direction.getOpposite())) {
+            return true;
+        }
+
+        // Check the other directions to find a potential path for the partial block.
+        for (Direction dir : DIRECTIONS) {
+            if (dir.getAxis() == direction.getAxis()) continue;
+            var adjacentPos = pos.relative(dir);
+            var adjacentState = level.getBlockState(adjacentPos);
+            if (adjacentState.isAir()) return true;
+        }
+
+        positions.add(pos.asLong());
+        return false;
+    };
+
+    public static Set<BlockPos> run(Level level, BlockPos start, int limit, SolidBlockPredicate predicate, boolean retainOrder) {
+        level.getProfiler().push("adastra-floodfill");
+
+        LongSet positions = retainOrder ? new LongLinkedOpenHashSet(limit) : new LongOpenHashSet(limit);
+        LongArrayFIFOQueue queue = new LongArrayFIFOQueue(limit);
+        queue.enqueue(start.asLong());
+
+        while (!queue.isEmpty() && positions.size() < limit) {
+            long packedPos = queue.dequeueLong();
+            if (positions.contains(packedPos)) continue;
+            positions.add(packedPos);
+
+            BlockPos.MutableBlockPos pos = new BlockPos.MutableBlockPos(BlockPos.getX(packedPos), BlockPos.getY(packedPos), BlockPos.getZ(packedPos));
+            for (Direction direction : DIRECTIONS) {
+                pos.set(packedPos);
+                pos.move(direction);
+                BlockState state = level.getBlockState(pos);
+                if (!predicate.test(level, pos, state, positions, queue, direction)) continue;
+                queue.enqueue(pos.asLong());
+            }
+        }
+
+        Set<BlockPos> result = retainOrder ? new LinkedHashSet<>(positions.size()) : new HashSet<>(positions.size());
+        for (long pos : positions) {
+            result.add(BlockPos.of(pos));
+        }
+
+        level.getProfiler().pop();
+        return result;
+    }
+
+    private static boolean isSideSolid(VoxelShape collisionShape, Direction dir) {
+        return switch (dir.getAxis()) {
+            case X -> isAxisCovered(collisionShape, Direction.Axis.Y, Direction.Axis.Z);
+            case Y -> isAxisCovered(collisionShape, Direction.Axis.X, Direction.Axis.Z);
+            case Z -> isAxisCovered(collisionShape, Direction.Axis.X, Direction.Axis.Y);
+        };
+    }
+
+    private static boolean isAxisCovered(VoxelShape shape, Direction.Axis axis1, Direction.Axis axis2) {
+        return shape.min(axis1) <= 0 && shape.max(axis1) >= 1 && shape.min(axis2) <= 0 && shape.max(axis2) >= 1;
+    }
+
+
+    private static boolean isFaceSturdy(VoxelShape collisionShape, Direction dir) {
+        VoxelShape faceShape = collisionShape.getFaceShape(dir);
+        if (faceShape.isEmpty()) return true;
+        var aabbs = faceShape.toAabbs();
+        if (aabbs.isEmpty()) return true;
+        return checkBounds(aabbs.get(0), dir.getAxis());
+    }
+
+    private static boolean checkBounds(AABB bounds, Direction.Axis axis) {
+        return switch (axis) {
+            case X -> bounds.minY <= 0 && bounds.maxY >= 1 && bounds.minZ <= 0 && bounds.maxZ >= 1;
+            case Y -> bounds.minX <= 0 && bounds.maxX >= 1 && bounds.minZ <= 0 && bounds.maxZ >= 1;
+            case Z -> bounds.minX <= 0 && bounds.maxX >= 1 && bounds.minY <= 0 && bounds.maxY >= 1;
+        };
+    }
+
+    @FunctionalInterface
+    public interface SolidBlockPredicate {
+
+        boolean test(Level level, BlockPos pos, BlockState state, LongSet positions, LongArrayFIFOQueue queue, Direction direction);
+    }
+}

src/main/java/net/xevianlight/aphelion/util/ModTags.java

@@ -17,6 +17,10 @@ public class ModTags {
         public static final TagKey<Block> STORAGE_BLOCKS = commonTag("storage_blocks");
         public static final TagKey<Block> STORAGE_BLOCKS_STEEL = commonTag("storage_blocks/steel");
 
+        public static final TagKey<Block> LAUNCH_PAD = createTag("launch_pad");
+        public static final TagKey<Block> PASSES_FLOOD_FILL = createTag("passes_flood_fill");
+        public static final TagKey<Block> BLOCKS_FLOOD_FILL = createTag("blocks_flood_fill");
+
         private static TagKey<Block> commonTag(String name) {
             return BlockTags.create(ResourceLocation.fromNamespaceAndPath("c", name));
         }
@@ -25,7 +29,6 @@ public class ModTags {
     public static class Items {
         public static final TagKey<Item> TEST_TAG = createTag("test_tag");
         public static final TagKey<Item> INGOTS = commonTag("ingots");
-
         public static final TagKey<Item> STORAGE_BLOCKS = commonTag("storage_blocks");
         public static final TagKey<Item> STORAGE_BLOCKS_STEEL = commonTag("storage_blocks/steel");
         public static final TagKey<Item> INGOT_ALUMINUM = commonTag("ingots/aluminum");

src/main/java/net/xevianlight/aphelion/util/RocketStructure.java

@@ -2,7 +2,9 @@ package net.xevianlight.aphelion.util;
 
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntList;
+import net.minecraft.core.BlockPos;
 import net.minecraft.nbt.*;
+import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.AABB;
@@ -135,4 +137,37 @@ public final class RocketStructure {
 
         return new Extents(minX, minY, minZ, maxX, maxY, maxZ);
     }
+
+    public static RocketStructure capture(Level level, BlockPos origin, int rx, int ry, int rz) {
+        return new RocketStructure(s -> {
+            for (int dy = -ry; dy <= ry; dy++) {
+                for (int dx = -rx; dx <= rx; dx++) {
+                    for (int dz = -rz; dz <= rz; dz++) {
+                        BlockPos p = origin.offset(dx, dy, dz);
+                        BlockState st = level.getBlockState(p);
+
+                        // Skip air and unbreakables/forbidden blocks as you like
+                        if (st.isAir()) continue;
+
+                        // Optional: ignore the assembler block itself
+                        // if (p.equals(origin)) continue;
+
+                        s.add(dx, dy, dz, st);
+                    }
+                }
+            }
+        });
+    }
+
+    public static void clearCaptured(Level level, BlockPos origin, RocketStructure struct) {
+        for (int i = 0; i < struct.size(); i++) {
+            int packed = struct.packedPosAt(i);
+            int dx = RocketStructure.unpackX(packed);
+            int dy = RocketStructure.unpackY(packed);
+            int dz = RocketStructure.unpackZ(packed);
+
+            BlockPos wp = origin.offset(dx, dy, dz);
+            level.setBlock(wp, Blocks.AIR.defaultBlockState(), 3);
+        }
+    }
 }

src/main/java/net/xevianlight/aphelion/util/TechnoFloodFill.java

@@ -0,0 +1,189 @@
+package net.xevianlight.aphelion.util;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.LevelChunk;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.List;
+
+/**
+ * Standalone flood-fill utility.
+ * - Traverses blocks starting from origin
+ * - Visits only positions allowed by Passable predicate
+ * - Bounded by maxRange (Manhattan distance)
+ * - Returns all visited positions (excluding origin by default)
+ */
+public final class TechnoFloodFill {
+
+    private TechnoFloodFill() {}
+
+    @FunctionalInterface
+    public interface Passable {
+        boolean test(Level level, BlockPos pos, BlockState state);
+    }
+
+    /** Convenience predicate: treat air as passable. */
+    public static final Passable AIR_ONLY = (level, pos, state) -> state.isAir();
+
+    /**
+     * Runs a bounded flood fill.
+     *
+     * @param level the world
+     * @param origin starting position (typically BE position)
+     * @param maxRange Manhattan range limit (|dx|+|dy|+|dz|)
+     * @param passable which blocks can be entered/added
+     * @param includeOrigin whether to include origin in the returned list
+     */
+    public static List<BlockPos> run(Level level, BlockPos origin, int maxRange, Passable passable, boolean includeOrigin) {
+        if (level == null) return List.of();
+
+        // Choose a grid size big enough to cover maxRange in all axes.
+        // We need coordinates within [-maxRange, +maxRange] around origin.
+        // So size must be >= (2*maxRange + 1). Next power-of-two for cheap indexing.
+        int needed = 2 * maxRange + 1;
+        int sizePow2 = nextPow2(needed);
+        int bits = Integer.numberOfTrailingZeros(sizePow2); // since pow2
+        BigVisitedGrid seen = new BigVisitedGrid(bits, origin.getX(), origin.getY(), origin.getZ());
+
+        // Chunk-cached blockstate fetch (no BE state needed)
+        ChunkCache chunkCache = new ChunkCache(level);
+
+        List<BlockPos> out = new ArrayList<>();
+        Deque<BlockPos> stack = new ArrayDeque<>();
+
+        if (includeOrigin) {
+            out.add(origin);
+        }
+
+        // Mark origin visited so we don't bounce back into it.
+        seen.add(origin.getX(), origin.getY(), origin.getZ());
+        stack.push(origin);
+
+        while (!stack.isEmpty()) {
+            BlockPos from = stack.pop();
+
+            for (Direction d : Direction.values()) {
+                BlockPos next = from.relative(d);
+
+                if (!inRangeManhattan(origin, next, maxRange)) continue;
+
+                // visited check first: cheapest early-out
+                if (!seen.add(next.getX(), next.getY(), next.getZ())) continue;
+
+                BlockState st = chunkCache.getBlockState(next);
+                if (!passable.test(level, next, st)) continue;
+
+                out.add(next);
+                stack.push(next);
+            }
+        }
+
+        return out;
+    }
+
+    private static boolean inRangeManhattan(BlockPos a, BlockPos b, int max) {
+        int dx = Math.abs(a.getX() - b.getX());
+        int dy = Math.abs(a.getY() - b.getY());
+        int dz = Math.abs(a.getZ() - b.getZ());
+        return dx + dy + dz <= max;
+    }
+
+    private static int nextPow2(int x) {
+        // smallest power of 2 >= x, with a minimum of 8
+        int v = 1;
+        while (v < x) v <<= 1;
+        return Math.max(v, 8);
+    }
+
+    /**
+     * Simple chunk cache for repeated reads in flood fill.
+     */
+    private static final class ChunkCache {
+        private final Level level;
+        private LevelChunk lastChunk;
+        private int lastCx = Integer.MIN_VALUE;
+        private int lastCz = Integer.MIN_VALUE;
+
+        private ChunkCache(Level level) {
+            this.level = level;
+        }
+
+        BlockState getBlockState(BlockPos pos) {
+            int cx = pos.getX() >> 4;
+            int cz = pos.getZ() >> 4;
+
+            if (cx != lastCx || cz != lastCz || lastChunk == null) {
+                lastChunk = level.getChunk(cx, cz); // may load/generate; okay for your current usage
+                lastCx = cx;
+                lastCz = cz;
+            }
+            return lastChunk.getBlockState(pos);
+        }
+    }
+
+    /**
+     * Packed visited grid centered on an origin.
+     *
+     * Uses an int[] with 32 bits per word:
+     * - size = 2^bits (must be power-of-two)
+     * - Word index layout: ((y * size) + z) * wordsPerRow + (x / 32)
+     * - Bit inside the word: (x % 32)
+     */
+    private static final class BigVisitedGrid {
+        private final int bits;
+        private final int size;
+        private final int wordsPerRow;
+        private final int[] words;
+        private final int xOff, yOff, zOff;
+
+        BigVisitedGrid(int bits, int xOrigin, int yOrigin, int zOrigin) {
+            if (bits < 3) throw new IllegalArgumentException("Grid too small (bits=" + bits + ")");
+            if (bits > 12) throw new IllegalArgumentException("Grid too large (bits=" + bits + ")");
+
+            this.bits = bits;
+            this.size = 1 << bits;
+
+            // Center origin at middle of grid
+            this.xOff = -xOrigin + (size / 2);
+            this.yOff = -yOrigin + (size / 2);
+            this.zOff = -zOrigin + (size / 2);
+
+            if ((size & 31) != 0) {
+                // to keep wordsPerRow integer
+                throw new IllegalArgumentException("Grid size must be divisible by 32, got " + size);
+            }
+
+            this.wordsPerRow = size >>> 5; // size / 32
+            int totalWords = wordsPerRow * size * size; // (y,z) rows * x-words
+            this.words = new int[totalWords];
+        }
+
+        /**
+         * @return true if it was NOT previously visited and is now marked visited
+         */
+        boolean add(int x, int y, int z) {
+            int inX = x + xOff;
+            int inY = y + yOff;
+            int inZ = z + zOff;
+
+            // Bounds check (fast and safe)
+            if ((inX | inY | inZ) < 0 || inX >= size || inY >= size || inZ >= size) {
+                return false; // out of grid => treat as "already seen" to prevent expansion
+            }
+
+            int wordIndex = ((inY * size) + inZ) * wordsPerRow + (inX >>> 5);
+            int bit = 1 << (inX & 31);
+
+            int prev = words[wordIndex];
+            if ((prev & bit) != 0) return false;
+
+            words[wordIndex] = prev | bit;
+            return true;
+        }
+    }
+}

src/main/resources/META-INF/neoforge.mods.toml

@@ -1,4 +1,4 @@
-# This is an example neoforge.mods.toml file. It contains the data relating to the loading mods.
+# This is an example neoforge.mods.toml file. It contains the partitionData relating to the loading mods.
 # There are several mandatory fields (#mandatory), and many more that are optional (#optional).
 # The overall format is standard TOML format, v0.5.0.
 # Note that there are a couple of TOML lists in this file.

src/main/resources/aphelion.mixins.json

@@ -4,6 +4,7 @@
   "package": "net.xevianlight.aphelion.mixins",
   "compatibilityLevel": "JAVA_21",
   "mixins": [
+    "common.LivingEntityMixin"
   ],
   "client": [
     "common.ClientLevelMixin",

src/main/resources/assets/aphelion/blockstates/launch_pad.json

@@ -0,0 +1,20 @@
+{
+  "variants": {
+    "north=true,east=true,south=true,west=true": { "model": "aphelion:block/launch_pad/0000" },
+    "north=false,east=true,south=true,west=true": { "model": "aphelion:block/launch_pad/1000" },
+    "north=true,east=false,south=true,west=true": { "model": "aphelion:block/launch_pad/0100" },
+    "north=true,east=true,south=false,west=true": { "model": "aphelion:block/launch_pad/0010" },
+    "north=true,east=true,south=true,west=false": { "model": "aphelion:block/launch_pad/0001" },
+    "north=false,east=false,south=true,west=true": { "model": "aphelion:block/launch_pad/1100" },
+    "north=false,east=true,south=false,west=true": { "model": "aphelion:block/launch_pad/1010" },
+    "north=false,east=true,south=true,west=false": { "model": "aphelion:block/launch_pad/1001" },
+    "north=true,east=false,south=false,west=true": { "model": "aphelion:block/launch_pad/0110" },
+    "north=true,east=false,south=true,west=false": { "model": "aphelion:block/launch_pad/0101" },
+    "north=true,east=true,south=false,west=false": { "model": "aphelion:block/launch_pad/0011" },
+    "north=false,east=false,south=false,west=true": { "model": "aphelion:block/launch_pad/1110" },
+    "north=false,east=false,south=true,west=false": { "model": "aphelion:block/launch_pad/1101" },
+    "north=false,east=true,south=false,west=false": { "model": "aphelion:block/launch_pad/1011" },
+    "north=true,east=false,south=false,west=false": { "model": "aphelion:block/launch_pad/0111" },
+    "north=false,east=false,south=false,west=false": { "model": "aphelion:block/launch_pad/1111" }
+  }
+}

src/main/resources/assets/aphelion/blockstates/pipe.json

@@ -0,0 +1,11 @@
+{
+  "multipart": [
+    { "apply": { "model": "aphelion:block/pipe_core" }},
+    { "when": { "north": "true" }, "apply": { "model": "aphelion:block/pipe_side" }},
+    { "when": { "east": "true" },  "apply": { "model": "aphelion:block/pipe_side", "y": 90 }},
+    { "when": { "south": "true" }, "apply": { "model": "aphelion:block/pipe_side", "y": 180 }},
+    { "when": { "west": "true" },  "apply": { "model": "aphelion:block/pipe_side", "y": 270 }},
+    { "when": { "up": "true" },    "apply": { "model": "aphelion:block/pipe_side", "x": 270 }},
+    { "when": { "down": "true" },  "apply": { "model": "aphelion:block/pipe_side", "x": 90 }}
+  ]
+}

src/main/resources/assets/aphelion/blockstates/rocket_assembler_block.json

@@ -0,0 +1,34 @@
+{
+  "variants": {
+    "facing=east,formed=false": {
+      "model": "aphelion:block/rocket_assembler_block",
+      "y": 90
+    },
+    "facing=north,formed=false": {
+      "model": "aphelion:block/rocket_assembler_block"
+    },
+    "facing=south,formed=false": {
+      "model": "aphelion:block/rocket_assembler_block",
+      "y": 180
+    },
+    "facing=west,formed=false": {
+      "model": "aphelion:block/rocket_assembler_block",
+      "y": 270
+    },
+    "facing=east,formed=true": {
+      "model": "aphelion:block/rocket_assembler_block_formed",
+      "y": 90
+    },
+    "facing=north,formed=true": {
+      "model": "aphelion:block/rocket_assembler_block_formed"
+    },
+    "facing=south,formed=true": {
+      "model": "aphelion:block/rocket_assembler_block_formed",
+      "y": 180
+    },
+    "facing=west,formed=true": {
+      "model": "aphelion:block/rocket_assembler_block_formed",
+      "y": 270
+    }
+  }
+}

src/main/resources/assets/aphelion/lang/en_us.json

@@ -3,6 +3,7 @@
   "block.aphelion.test_block": "Test Block",
   "block.aphelion.electric_arc_furnace": "Electric Arc Furnace",
   "block.aphelion.vacuum_arc_furnace_controller": "Vacuum Arc Furnace Controller",
+  "block.aphelion.arc_furnace_casing": "Arc Furnace Casing",
   "block.aphelion.vaf_dummy_block": "Vacuum Arc Furnace",
 
   "item.aphelion.ingot_steel": "Steel Ingot",
@@ -28,6 +29,10 @@
   "tag.item.c.ingots.steel": "Steel Ingots",
   "tag.item.c.ingots.aluminum": "Aluminum Ingots",
 
+  "entity.aphelion.rocket": "Rocket",
+
+  "fluid_type.aphelion.oil": "Oil",
+
 
   "command.aphelion.station.orbit.set": "Set station (%s, %s)'s orbit to %s",
   "command.aphelion.station.orbit.get": "Station (%s, %s)'s orbit is assigned to %s",

src/main/resources/assets/aphelion/models/block/launch_pad/0000.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0000",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0000"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0001.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0001",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0001"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0010.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0010",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0010"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0011.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0011",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0011"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0100.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0100",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0100"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0101.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0101",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0101"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0110.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0110",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0110"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/0111.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/0111",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/0111"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1000.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1000",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1000"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1001.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1001",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1001"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1010.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1010",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1010"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1011.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1011",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1011"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1100.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1100",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1100"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1101.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1101",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1101"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1110.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1110",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1110"
+  }
+}

src/main/resources/assets/aphelion/models/block/launch_pad/1111.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/cube_bottom_top",
+  "textures": {
+    "top": "aphelion:block/launch_pad/1111",
+    "side": "aphelion:block/launch_pad/topbottom",
+    "bottom": "aphelion:block/launch_pad/1111"
+  }
+}

src/main/resources/assets/aphelion/models/block/pipe_core.json

@@ -0,0 +1,20 @@
+{
+  "ambientocclusion": false,
+  "textures": {
+    "texture": "aphelion:block/pipe_texture"
+  },
+  "elements": [
+    {
+      "from": [ 6, 6, 6 ],
+      "to": [ 10, 10, 10 ],
+      "faces": {
+        "down":  { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "up":    { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "north": { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "south": { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "west":  { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "east":  { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] }
+      }
+    }
+  ]
+}

src/main/resources/assets/aphelion/models/block/pipe_side.json

@@ -0,0 +1,18 @@
+{
+  "textures": {
+    "texture": "aphelion:block/pipe_texture"
+  },
+  "elements": [
+    {
+      "from": [ 6, 6, 0 ],
+      "to": [ 10, 10, 6 ],
+      "faces": {
+        "down":  { "texture": "#texture", "uv": [ 6, 0, 10, 6 ] },
+        "up":    { "texture": "#texture", "uv": [ 6, 0, 10, 6 ] },
+        "north": { "texture": "#texture", "uv": [ 6, 6, 10, 10 ] },
+        "west":  { "texture": "#texture", "uv": [ 0, 6, 6, 10 ] },
+        "east":  { "texture": "#texture", "uv": [ 0, 6, 6, 10 ] }
+      }
+    }
+  ]
+}

src/main/resources/assets/aphelion/models/block/rocket_assembler_block.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/orientable",
+  "textures": {
+    "front": "minecraft:block/furnace_front",
+    "side": "aphelion:block/test_block",
+    "top": "aphelion:block/test_block"
+  }
+}

src/main/resources/assets/aphelion/models/block/rocket_assembler_block_formed.json

@@ -0,0 +1,8 @@
+{
+  "parent": "minecraft:block/orientable",
+  "textures": {
+    "front": "minecraft:block/furnace_front",
+    "side": "aphelion:block/arc_furnace_casing_formed",
+    "top": "aphelion:block/arc_furnace_casing_formed"
+  }
+}

src/main/resources/assets/aphelion/models/item/launch_pad.json

@@ -0,0 +1,3 @@
+{
+  "parent": "aphelion:block/launch_pad/1111"
+}