src/main/java/fr/adrien1106/reframed/ReFramed.java

@@ -24,16 +24,14 @@ import java.util.ArrayList;
 import java.util.function.BiConsumer;
 import java.util.stream.Collectors;
 
-/**
- * TODO multiple camos
- */
 public class ReFramed implements ModInitializer {
 	public static final String MODID = "reframed";
 
 	public static final ArrayList<Block> BLOCKS = new ArrayList<>();
-	public static Block CUBE, STAIRS, SLAB, POST, FENCE, FENCE_GATE, DOOR, TRAPDOOR, IRON_DOOR, IRON_TRAPDOOR, PRESSURE_PLATE, BUTTON, LEVER, WALL, CARPET, PANE, CANDLE;
+	public static Block CUBE, STAIRS, SLAB, DOUBLE_SLAB, POST, FENCE, FENCE_GATE, DOOR, TRAPDOOR, IRON_DOOR, IRON_TRAPDOOR, PRESSURE_PLATE, BUTTON, LEVER, WALL, CARPET, PANE, CANDLE;
 
 	public static BlockEntityType<ReFramedEntity> REFRAMED_BLOCK_ENTITY;
+	public static BlockEntityType<ReFramedDoubleEntity> REFRAMED_DOUBLE_BLOCK_ENTITY;
 
 	public static BiConsumer<World, BlockPos> chunkRerenderProxy = (world, pos) -> {};
 	
@@ -47,6 +45,7 @@ public class ReFramed implements ModInitializer {
 		CUBE           = registerReFramed("cube"          , new ReFramedBlock(ReFramedInteractionUtil.makeSettings()));
 		STAIRS         = registerReFramed("stairs"        , new ReFramedStairsBlock(cp(Blocks.OAK_STAIRS)));
 		SLAB           = registerReFramed("slab"          , new ReFramedSlabBlock(cp(Blocks.OAK_SLAB)));
+		DOUBLE_SLAB    = registerReFramed("double_slab"   , new ReFramedDoubleSlabBlock(cp(Blocks.OAK_SLAB)));
 		POST           = registerReFramed("post"          , new ReFramedPostBlock(cp(Blocks.OAK_FENCE)));
 		FENCE          = registerReFramed("fence"         , new ReFramedFenceBlock(cp(Blocks.OAK_FENCE)));
 		FENCE_GATE     = registerReFramed("fence_gate"    , new ReFramedFenceGateBlock(cp(Blocks.OAK_FENCE_GATE)));
@@ -63,7 +62,19 @@ public class ReFramed implements ModInitializer {
 		CANDLE         = registerReFramed("candle"        , new ReFramedCandleBlock(ReFramedCandleBlock.configureSettings(cp(Blocks.CANDLE))));
 
 		REFRAMED_BLOCK_ENTITY = Registry.register(Registries.BLOCK_ENTITY_TYPE, id("camo"),
-			FabricBlockEntityTypeBuilder.create((pos, state) -> new ReFramedEntity(REFRAMED_BLOCK_ENTITY, pos, state), BLOCKS.toArray(new Block[0])).build(null)
+			FabricBlockEntityTypeBuilder.create(
+				(pos, state) -> new ReFramedEntity(REFRAMED_BLOCK_ENTITY, pos, state),
+				BLOCKS.stream()
+					.filter(block -> !(block instanceof ReFramedDoubleBlock))
+					.toArray(Block[]::new)).build(null)
+		);
+
+		REFRAMED_DOUBLE_BLOCK_ENTITY = Registry.register(Registries.BLOCK_ENTITY_TYPE, id("double_camo"),
+			FabricBlockEntityTypeBuilder.create(
+				(pos, state) -> new ReFramedDoubleEntity(REFRAMED_DOUBLE_BLOCK_ENTITY, pos, state),
+				BLOCKS.stream()
+					.filter(block -> block instanceof ReFramedDoubleBlock)
+					.toArray(Block[]::new)).build(null)
 		);
 		
 		Registry.register(Registries.ITEM_GROUP, id("tab"), FabricItemGroup.builder()

src/main/java/fr/adrien1106/reframed/block/ReFramedBlock.java

@@ -1,29 +1,44 @@
 package fr.adrien1106.reframed.block;
 
-import com.google.common.base.MoreObjects;
 import fr.adrien1106.reframed.ReFramed;
-import fr.adrien1106.reframed.util.ReFramedInteractionUtil;
+import fr.adrien1106.reframed.util.ReframedInteractible;
+import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.*;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.item.ItemPlacementContext;
-import net.minecraft.item.ItemStack;
+import net.minecraft.item.*;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.sound.SoundEvents;
 import net.minecraft.state.StateManager;
+import net.minecraft.state.property.BooleanProperty;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
+import net.minecraft.util.ItemScatterer;
+import net.minecraft.util.collection.DefaultedList;
+import net.minecraft.util.function.BooleanBiFunction;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.util.shape.VoxelShapes;
 import net.minecraft.world.BlockView;
+import net.minecraft.world.GameRules;
 import net.minecraft.world.World;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.List;
+
+import static net.minecraft.util.shape.VoxelShapes.*;
+
 public class ReFramedBlock extends Block implements BlockEntityProvider {
+
+	public static final BooleanProperty LIGHT = BooleanProperty.of("frame_light");
+
 	public ReFramedBlock(Settings settings) {
 		super(settings);
-		setDefaultState(ReFramedInteractionUtil.setDefaultStates(getDefaultState()));
+		setDefaultState(getDefaultState().with(LIGHT, false));
 	}
 	
 	//For addon devs: override this so your blocks don't end up trying to place my block entity, my BlockEntityType only handles blocks internal to the mod
@@ -35,51 +50,262 @@ public class ReFramedBlock extends Block implements BlockEntityProvider {
 
 	@Override
 	protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
-		super.appendProperties(ReFramedInteractionUtil.appendProperties(builder));
+		super.appendProperties(builder.add(LIGHT));
 	}
 	
 	@Nullable
 	@Override
 	public BlockState getPlacementState(ItemPlacementContext ctx) {
-		return ReFramedInteractionUtil.modifyPlacementState(super.getPlacementState(ctx), ctx);
+		return ReFramedEntity.getNbtLightLevel(super.getPlacementState(ctx), ctx.getStack());
 	}
 	
 	@Override
 	public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
-		ActionResult r = ReFramedInteractionUtil.onUse(state, world, pos, player, hand, hit);
-		if(!r.isAccepted()) r = super.onUse(state, world, pos, player, hand, hit);
-		return r;
+		if (!canUse(world, pos, player)) return superUse(state, world, pos, player, hand, hit);
+		ActionResult result = useUpgrade(state, world, pos, player, hand);
+		if (result.isAccepted()) return result;
+		return useCamo(state, world, pos, player, hand, hit, 1);
+
+	}
+
+	// don't like this but might be useful
+	protected ActionResult superUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
+		return super.onUse(state, world, pos, player, hand, hit);
+	}
+
+	protected boolean canUse(World world, BlockPos pos, PlayerEntity player) {
+		return player.canModifyBlocks() && world.canPlayerModifyAt(player, pos);
+	}
+
+	protected static ActionResult useUpgrade(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand) {
+		if(!(world.getBlockEntity(pos) instanceof ReFramedEntity block_entity)) return ActionResult.PASS;
+
+		ItemStack held = player.getStackInHand(hand);
+		ReframedInteractible ext = state.getBlock() instanceof ReframedInteractible e ? e : ReframedInteractible.Default.INSTANCE;
+
+		// frame will emit light if applied with glowstone
+		if(state.contains(LIGHT) && held.getItem() == Items.GLOWSTONE_DUST) {
+			block_entity.toggleLight();
+			world.setBlockState(pos, state.with(LIGHT, block_entity.emitsLight()));
+
+			if(!player.isCreative())
+				if (block_entity.emitsLight()) held.decrement(1);
+				else held.increment(1);
+			world.playSound(player, pos, SoundEvents.BLOCK_GLASS_HIT, SoundCategory.BLOCKS, 1f, 1f);
+			return ActionResult.SUCCESS;
+		}
+
+		// frame will emit redstone if applied with redstone torch can deactivate redstone block camo emission
+		if(held.getItem() == Items.REDSTONE_TORCH && ext.canAddRedstoneEmission(state, world, pos)) {
+			block_entity.toggleRedstone();
+
+			if(!player.isCreative())
+				if (block_entity.emitsRedstone()) held.decrement(1);
+				else held.increment(1);
+			world.playSound(player, pos, SoundEvents.BLOCK_LEVER_CLICK, SoundCategory.BLOCKS, 1f, 1f);
+			return ActionResult.SUCCESS;
+		}
+
+		// Frame will lose its collision if applied with popped chorus fruit
+		if(held.getItem() == Items.POPPED_CHORUS_FRUIT && ext.canRemoveCollision(state, world, pos)) {
+			block_entity.toggleSolidity();
+
+			if(!player.isCreative())
+				if (!block_entity.isSolid()) held.decrement(1);
+				else held.increment(1);
+			world.playSound(player, pos, SoundEvents.ITEM_CHORUS_FRUIT_TELEPORT, SoundCategory.BLOCKS, 1f, 1f);
+			return ActionResult.SUCCESS;
+		}
+
+		return ActionResult.PASS;
+	}
+
+	protected static ActionResult useCamo(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit, int theme_index) {
+		if(!(world.getBlockEntity(pos) instanceof ReFramedEntity block_entity)) return ActionResult.PASS;
+
+		// Changing the theme
+		ItemStack held = player.getStackInHand(hand);
+		if(held.getItem() instanceof BlockItem block_item && block_entity.getTheme(theme_index).getBlock() == Blocks.AIR) {
+			Block block = block_item.getBlock();
+			ItemPlacementContext ctx = new ItemPlacementContext(new ItemUsageContext(player, hand, hit));
+			BlockState placement_state = block.getPlacementState(ctx);
+			if(placement_state != null && isShapeFullCube(placement_state.getCollisionShape(world, pos)) && !(block instanceof BlockEntityProvider)) {
+				List<BlockState> themes = block_entity.getThemes();
+				if(!world.isClient) block_entity.setTheme(placement_state, theme_index);
+
+				// check for default light emission
+				if (placement_state.getLuminance() > 0
+					&& themes.stream().noneMatch(theme -> theme.getLuminance() > 0))
+						if (block_entity.emitsLight()) Block.dropStack(world, pos, new ItemStack(Items.GLOWSTONE_DUST));
+						else block_entity.toggleLight();
+
+				world.setBlockState(pos, state.with(LIGHT, block_entity.emitsLight()));
+
+				// check for default redstone emission
+				if (placement_state.getWeakRedstonePower(world, pos, Direction.NORTH) > 0
+					&& themes.stream().noneMatch(theme -> theme.getWeakRedstonePower(world, pos, Direction.NORTH) > 0))
+						if (block_entity.emitsRedstone()) Block.dropStack(world, pos, new ItemStack(Items.GLOWSTONE_DUST));
+						else block_entity.toggleRedstone();
+
+				if(!player.isCreative()) held.decrement(1);
+				world.playSound(player, pos, placement_state.getSoundGroup().getPlaceSound(), SoundCategory.BLOCKS, 1f, 1.1f);
+				return ActionResult.SUCCESS;
+			}
+		}
+
+		return ActionResult.PASS;
 	}
 	
 	@Override
 	public void onStateReplaced(BlockState state, World world, BlockPos pos, BlockState newState, boolean moved) {
-		ReFramedInteractionUtil.onStateReplaced(state, world, pos, newState, moved);
+		if(!state.isOf(newState.getBlock()) &&
+			world.getBlockEntity(pos) instanceof ReFramedEntity frame_entity &&
+			world.getGameRules().getBoolean(GameRules.DO_TILE_DROPS)
+		) {
+			DefaultedList<ItemStack> drops = DefaultedList.of();
+
+			List<BlockState> themes = frame_entity.getThemes();
+			themes.forEach(theme -> {
+				if(theme.getBlock() != Blocks.AIR) drops.add(new ItemStack(theme.getBlock()));
+			});
+
+			if(frame_entity.emitsRedstone()
+				&& themes.stream().noneMatch(theme -> theme.getWeakRedstonePower(world, pos, Direction.NORTH) != 0))
+					drops.add(new ItemStack(Items.REDSTONE_TORCH));
+			if(frame_entity.emitsLight()
+				&& themes.stream().noneMatch(theme -> theme.getLuminance() != 0))
+					drops.add(new ItemStack(Items.GLOWSTONE_DUST));
+			if(!frame_entity.isSolid()
+				&& themes.stream().anyMatch(theme -> theme.isSolid()))
+				drops.add(new ItemStack(Items.POPPED_CHORUS_FRUIT));
+
+			ItemScatterer.spawn(world, pos, drops);
+		}
 		super.onStateReplaced(state, world, pos, newState, moved);
 	}
 	
 	@Override
 	public void onPlaced(World world, BlockPos pos, BlockState state, @Nullable LivingEntity placer, ItemStack stack) {
-		ReFramedInteractionUtil.onPlaced(world, pos, state, placer, stack);
+		if(world.isClient && world.getBlockEntity(pos) instanceof ReFramedEntity be) {
+			NbtCompound tag = BlockItem.getBlockEntityNbt(stack);
+			if(tag != null) be.readNbt(tag);
+		}
 		super.onPlaced(world, pos, state, placer, stack);
 	}
 	
 	@Override
 	public VoxelShape getCollisionShape(BlockState state, BlockView view, BlockPos pos, ShapeContext ctx) {
-		return MoreObjects.firstNonNull(ReFramedInteractionUtil.getCollisionShape(state, view, pos, ctx), super.getCollisionShape(state, view, pos, ctx));
+		return isGhost(view, pos)
+			? VoxelShapes.empty()
+			: super.getCollisionShape(state, view, pos, ctx);
 	}
-	
+
 	@Override
-	public boolean emitsRedstonePower(BlockState state) {
-		return ReFramedInteractionUtil.emitsRedstonePower(state);
+	public VoxelShape getCullingShape(BlockState state, BlockView view, BlockPos pos) {
+		return isGhost(view, pos)
+			? VoxelShapes.empty()
+			: super.getCullingShape(state, view, pos);
+	}
+
+	public VoxelShape getShape(BlockState state, int i) {
+		// assuming the shape don't need the world and position
+		return getOutlineShape(state, null, null, null);
+	}
+
+	public boolean isGhost(BlockView view, BlockPos pos) {
+		return view.getBlockEntity(pos) instanceof ReFramedEntity be && !be.isSolid();
 	}
 	
 	@Override
 	public int getWeakRedstonePower(BlockState state, BlockView view, BlockPos pos, Direction dir) {
-		return ReFramedInteractionUtil.getWeakRedstonePower(state, view, pos, dir);
+		return view.getBlockEntity(pos) instanceof ReFramedEntity be && be.emitsRedstone() ? 15 : 0;
 	}
 	
 	@Override
 	public int getStrongRedstonePower(BlockState state, BlockView view, BlockPos pos, Direction dir) {
-		return ReFramedInteractionUtil.getStrongRedstonePower(state, view, pos, dir);
+		return getWeakRedstonePower(state, view, pos, dir);
+	}
+
+	public int getTopThemeIndex(BlockState state) {
+		return 1;
+	}
+
+	// Doing this method from scratch as it is simpler to do than injecting everywhere
+	public static boolean shouldDrawSide(BlockState self_state, BlockView world, BlockPos pos, Direction side, BlockPos other_pos, int theme_index) {
+		ThemeableBlockEntity self = world.getBlockEntity(pos) instanceof ThemeableBlockEntity e ? e : null;
+		ThemeableBlockEntity other = world.getBlockEntity(other_pos) instanceof ThemeableBlockEntity e ? e : null;
+		BlockState other_state = world.getBlockState(other_pos);
+
+		// normal behaviour
+		if (self == null && other == null) return shouldDrawSide(self_state, world, pos, side, other_pos);
+
+		// self is a normal Block
+		if (self == null && other_state.getBlock() instanceof ReFramedBlock other_block) {
+			VoxelShape self_shape = self_state.getCullingShape(world, pos);
+			if (self_shape.isEmpty()) return true;
+
+			int i = 0;
+			VoxelShape other_shape = VoxelShapes.empty();
+			for (BlockState s: other.getThemes()) {
+				i++;
+				if (self_state.isSideInvisible(s, side) || s.isOpaque())
+					other_shape = combine(
+						other_shape,
+						other_block
+							.getShape(other_state, i)
+							.getFace(side.getOpposite()),
+						BooleanBiFunction.OR
+					);
+			}
+
+			// determine if side needs to be rendered
+			return VoxelShapes.matchesAnywhere(self_shape, other_shape, BooleanBiFunction.ONLY_FIRST);
+		}
+
+		BlockState self_theme = self.getTheme(theme_index);
+		// other is normal Block
+		if (other == null && self_state.getBlock() instanceof ReFramedBlock self_block) {
+			// Transparent is simple if self and the neighbor are invisible don't render side (like default)
+			if (self_theme.isSideInvisible(other_state, side)) return false;
+
+			// Opaque is also simple as each model are rendered one by one
+			if (self_theme.isOpaque()) {
+				// no cache section :( because it differs between each instance of the frame
+				VoxelShape self_shape = self_block.getShape(self_state, theme_index).getFace(side);
+				if (self_shape.isEmpty()) return true;
+				VoxelShape other_shape = other_state.getCullingFace(world, other_pos, side.getOpposite());
+
+				// determine if side needs to be rendered
+				return VoxelShapes.matchesAnywhere(self_shape, other_shape, BooleanBiFunction.ONLY_FIRST);
+			}
+
+			return true;
+		}
+
+		// Both are frames
+		// here both are computed in the same zone as there will necessarily a shape comparison
+		if (self_state.getBlock() instanceof ReFramedBlock self_block && other_state.getBlock() instanceof ReFramedBlock other_block) {
+			VoxelShape self_shape = self_block.getShape(self_state, theme_index).getFace(side);
+			if (self_shape.isEmpty()) return true;
+
+			int i = 0;
+			VoxelShape other_shape = VoxelShapes.empty();
+			for (BlockState s: other.getThemes()) {
+				i++;
+				if (self_theme.isSideInvisible(s, side) || s.isOpaque())
+					other_shape = combine(
+						other_shape,
+						other_block
+							.getShape(other_state, i)
+							.getFace(side.getOpposite()),
+						BooleanBiFunction.OR
+					);
+			}
+
+			// determine if side needs to be rendered
+			return VoxelShapes.matchesAnywhere(self_shape, other_shape, BooleanBiFunction.ONLY_FIRST);
+		}
+
+		return true;
 	}
 }

src/main/java/fr/adrien1106/reframed/block/ReFramedDoubleBlock.java

@@ -0,0 +1,96 @@
+package fr.adrien1106.reframed.block;
+
+import fr.adrien1106.reframed.ReFramed;
+import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.ShapeContext;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.world.BlockView;
+import net.minecraft.world.World;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import static net.minecraft.util.shape.VoxelShapes.empty;
+import static net.minecraft.util.shape.VoxelShapes.fullCube;
+
+public abstract class ReFramedDoubleBlock extends ReFramedBlock {
+    public ReFramedDoubleBlock(Settings settings) {
+        super(settings);
+    }
+
+    @Override
+    public @Nullable BlockEntity createBlockEntity(BlockPos pos, BlockState state) {
+        return ReFramed.REFRAMED_DOUBLE_BLOCK_ENTITY.instantiate(pos, state);
+    }
+
+    protected int getHitPart(BlockState state, BlockHitResult hit) {
+        Direction side = hit.getSide();
+        VoxelShape first_shape = getShape(state, 1);
+        VoxelShape second_shape = getShape(state, 2);
+
+        // Determine if any of the two shape is covering the side entirely
+        if (isFaceFullSquare(first_shape, side)) return 1;
+        if (isFaceFullSquare(second_shape, side)) return 2;
+
+        Vec3d pos = hit.getPos();
+        BlockPos origin = hit.getBlockPos();
+        Map<Direction.Axis, Double> axes = Arrays.stream(Direction.Axis.values())
+            .filter(axis -> axis != side.getAxis())
+            .collect(Collectors.toMap(
+                axis -> axis,
+                axis -> axis.choose(pos.getX() - origin.getX(), pos.getY() - origin.getY(), pos.getZ() - origin.getZ()))
+            );
+
+        if (matchesFace(first_shape.getFace(side), axes)) return 1;
+        if (matchesFace(second_shape.getFace(side), axes)) return 2;
+        return 0;
+    }
+
+    private static boolean matchesFace(VoxelShape shape, Map<Direction.Axis, Double> axes) {
+        return shape.getBoundingBoxes().stream()
+            .anyMatch(box ->
+                axes.keySet().stream()
+                    .map(axis -> box.getMin(axis) <= axes.get(axis) && box.getMax(axis) >= axes.get(axis))
+                    .reduce((prev, current) -> prev && current).get()
+            );
+    }
+
+    @Override
+    public boolean isTransparent(BlockState state, BlockView world, BlockPos pos) {
+        return world.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity
+            && framed_entity.getThemes().stream().allMatch(theme -> theme.isTransparent(world, pos));
+    }
+
+    public VoxelShape getRenderOutline(BlockState state, BlockHitResult hit) {
+        return getShape(state, getHitPart(state, hit));
+    }
+
+    @Override
+    public VoxelShape getCollisionShape(BlockState state, BlockView view, BlockPos pos, ShapeContext ctx) {
+        return isGhost(view, pos) ? empty() : fullCube();
+    }
+
+    @Override
+    public VoxelShape getCullingShape(BlockState state, BlockView view, BlockPos pos) {
+        return isGhost(view, pos) ? empty() : fullCube();
+    }
+
+    @Override
+    public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
+        if (!canUse(world, pos, player)) return superUse(state, world, pos, player, hand, hit);
+        ActionResult result = useUpgrade(state, world, pos, player, hand);
+        if (result.isAccepted()) return result;
+        return useCamo(state, world, pos, player, hand, hit, getHitPart(state, hit));
+    }
+}

src/main/java/fr/adrien1106/reframed/block/ReFramedDoubleEntity.java

@@ -9,6 +9,7 @@ import net.minecraft.nbt.NbtHelper;
 import net.minecraft.registry.Registries;
 import net.minecraft.util.math.BlockPos;
 
+import java.util.List;
 import java.util.Objects;
 
 public class ReFramedDoubleEntity extends ReFramedEntity {
@@ -20,15 +21,23 @@ public class ReFramedDoubleEntity extends ReFramedEntity {
     }
 
     @Override
-    public BlockState getSecondTheme() {
-        return second_state;
+    public BlockState getTheme(int i) {
+        return i == 2 ? second_state : super.getTheme(i);
     }
 
-    public void setSecondTheme(BlockState newState) {
-        if(!Objects.equals(second_state, newState)) {
-            second_state = newState;
+    @Override
+    public List<BlockState> getThemes() {
+        List<BlockState> themes = super.getThemes();
+        themes.add(second_state);
+        return themes;
+    }
+
+    public void setTheme(BlockState new_state, int i) {
+        if(i == 2) {
+            if (Objects.equals(second_state, new_state)) return;
+            second_state = new_state;
             markDirtyAndDispatch();
-        }
+        } else super.setTheme(new_state, i);
     }
 
     @Override
@@ -36,7 +45,7 @@ public class ReFramedDoubleEntity extends ReFramedEntity {
         super.readNbt(nbt);
 
         BlockState rendered_state = second_state;// keep previous state to check if rerender is needed
-        first_state = NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), nbt.getCompound(BLOCKSTATE_KEY + 2));
+        second_state = NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), nbt.getCompound(BLOCKSTATE_KEY + 2));
 
         // Force a chunk remesh on the client if the displayed blockstate has changed
         if(world != null && world.isClient && !Objects.equals(rendered_state, second_state)) {

src/main/java/fr/adrien1106/reframed/block/ReFramedDoubleSlabBlock.java

@@ -0,0 +1,64 @@
+package fr.adrien1106.reframed.block;
+
+import fr.adrien1106.reframed.ReFramed;
+import fr.adrien1106.reframed.generator.GBlockstate;
+import fr.adrien1106.reframed.generator.MultipartBlockStateProvider;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.data.client.MultipartBlockStateSupplier;
+import net.minecraft.item.ItemPlacementContext;
+import net.minecraft.state.StateManager;
+import net.minecraft.state.property.Properties;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.shape.VoxelShape;
+import org.jetbrains.annotations.Nullable;
+
+import static fr.adrien1106.reframed.block.ReFramedSlabBlock.*;
+import static net.minecraft.data.client.VariantSettings.Rotation.*;
+import static net.minecraft.state.property.Properties.AXIS;
+
+public class ReFramedDoubleSlabBlock extends ReFramedDoubleBlock implements MultipartBlockStateProvider {
+    public ReFramedDoubleSlabBlock(Settings settings) {
+        super(settings);
+        setDefaultState(getDefaultState().with(Properties.AXIS, Direction.Axis.Y));
+    }
+
+    @Override
+    protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
+        super.appendProperties(builder.add(Properties.AXIS));
+    }
+
+    @Nullable
+    @Override
+    public BlockState getPlacementState(ItemPlacementContext ctx) {
+        return super.getPlacementState(ctx).with(Properties.AXIS, ctx.getSide().getAxis());
+    }
+
+    @Override
+    public VoxelShape getShape(BlockState state, int i) {
+        return switch (state.get(Properties.AXIS)) {
+            case Y -> i == 2 ? UP    : DOWN;
+            case Z -> i == 2 ? NORTH : SOUTH;
+            case X -> i == 2 ? EAST  : WEST;
+        };
+    }
+
+    @Override
+    public int getTopThemeIndex(BlockState state) {
+        // when the side is shared just return one
+        return state.get(AXIS) == Direction.Axis.Y ? 2: super.getTopThemeIndex(state);
+    }
+
+    @Override
+    public MultipartBlockStateSupplier getMultipart() {
+        Identifier model_id = ReFramed.id("double_slab_special");
+        return MultipartBlockStateSupplier.create(this)
+            .with(GBlockstate.when(AXIS, Direction.Axis.Y),
+                GBlockstate.variant(model_id, true, R0, R0))
+            .with(GBlockstate.when(AXIS, Direction.Axis.Z),
+                GBlockstate.variant(model_id, true, R90, R0))
+            .with(GBlockstate.when(AXIS, Direction.Axis.X),
+                GBlockstate.variant(model_id, true, R90, R90));
+    }
+}

src/main/java/fr/adrien1106/reframed/block/ReFramedEntity.java

@@ -1,7 +1,6 @@
 package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
-import fr.adrien1106.reframed.util.ReFramedInteractionUtil;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
@@ -21,6 +20,8 @@ import net.minecraft.util.math.BlockPos;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Objects;
 
 //Keeping the weight of this block entity down, both in terms of memory consumption and NBT sync traffic,
@@ -28,7 +29,7 @@ import java.util.Objects;
 //To that end, most of the state has been crammed into a bitfield.
 public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity {
 	protected BlockState first_state = Blocks.AIR.getDefaultState();
-	protected byte bitfield = SOLIDITY_MASK;
+	protected byte bit_field = SOLIDITY_MASK;
 	
 	protected static final byte LIGHT_MASK    = 0b001;
 	protected static final byte REDSTONE_MASK = 0b010;
@@ -47,7 +48,7 @@ public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity
 		
 		BlockState rendered_state = first_state; // keep previous state to check if rerender is needed
 		first_state = NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), nbt.getCompound(BLOCKSTATE_KEY + 1));
-		if (nbt.contains(BITFIELD_KEY)) bitfield = nbt.getByte(BITFIELD_KEY);
+		if (nbt.contains(BITFIELD_KEY)) bit_field = nbt.getByte(BITFIELD_KEY);
 		
 		// Force a chunk remesh on the client if the displayed blockstate has changed
 		if(world != null && world.isClient && !Objects.equals(rendered_state, first_state)) {
@@ -60,35 +61,34 @@ public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity
 		super.writeNbt(nbt);
 		
 		if(first_state != Blocks.AIR.getDefaultState()) nbt.put(BLOCKSTATE_KEY + 1, NbtHelper.fromBlockState(first_state));
-		if(bitfield != SOLIDITY_MASK) nbt.putByte(BITFIELD_KEY, bitfield);
+		if(bit_field != SOLIDITY_MASK) nbt.putByte(BITFIELD_KEY, bit_field);
 	}
 
-	// TODO revisit
-	public static @NotNull BlockState readStateFromItem(ItemStack stack) {
-		NbtCompound blockEntityTag = BlockItem.getBlockEntityNbt(stack);
-		if(blockEntityTag == null) return Blocks.AIR.getDefaultState();
+	public static @NotNull BlockState readStateFromItem(ItemStack stack, int state) {
+		NbtCompound nbt = BlockItem.getBlockEntityNbt(stack);
+		if(nbt == null) return Blocks.AIR.getDefaultState();
 		
 		//slightly paranoid NBT handling cause you never know what mysteries are afoot with items
-		NbtElement subElement;
-		if(blockEntityTag.contains(BLOCKSTATE_KEY)) subElement = blockEntityTag.get(BLOCKSTATE_KEY + 1);
+		NbtElement element;
+		if(nbt.contains(BLOCKSTATE_KEY + state)) element = nbt.get(BLOCKSTATE_KEY + state);
 		else return Blocks.AIR.getDefaultState();
 		
-		if(!(subElement instanceof NbtCompound subCompound)) return Blocks.AIR.getDefaultState();
-		else return NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), subCompound);
+		if(!(element instanceof NbtCompound compound)) return Blocks.AIR.getDefaultState();
+		else return NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), compound);
 	}
 	
 	//Awkward: usually the BlockState is the source of truth for things like the "emits light" blockstate, but if you
 	//ctrl-pick a glowing block and place it, it should still be glowing. This is some hacky shit that guesses the value of
 	//the LIGHT blockstate based off information in the NBT tag, and also prevents bugginess like "the blockstate is not
 	//glowing but the copied NBT thinks glowstone dust was already added, so it refuses to accept more dust"
-	public static @Nullable BlockState weirdNbtLightLevelStuff(@Nullable BlockState state, ItemStack stack) {
+	public static @Nullable BlockState getNbtLightLevel(@Nullable BlockState state, ItemStack stack) {
 		if(state == null || stack == null) return state;
 		
 		NbtCompound nbt = BlockItem.getBlockEntityNbt(stack);
 		if(nbt == null) return state;
 		
-		if(state.contains(ReFramedInteractionUtil.LIGHT)) {
-			state = state.with(ReFramedInteractionUtil.LIGHT,
+		if(state.contains(ReFramedBlock.LIGHT)) {
+			state = state.with(ReFramedBlock.LIGHT,
 				((nbt.contains(BITFIELD_KEY)
 					? nbt.getByte(BITFIELD_KEY)
 					: SOLIDITY_MASK)
@@ -100,47 +100,57 @@ public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity
 	}
 
 	@Override
-	public BlockState getFirstTheme() {
+	public BlockState getTheme(int i) {
 		return first_state;
 	}
-	
-	public void setFirstTheme(BlockState newState) {
-		if(!Objects.equals(first_state, newState)) {
-			first_state = newState;
+
+	@Override
+	public List<BlockState> getThemes() {
+		List<BlockState> themes = new ArrayList<>();
+		themes.add(first_state);
+		return themes;
+	}
+
+	public void setTheme(BlockState new_state, int i) {
+		if(!Objects.equals(first_state, new_state)) {
+			first_state = new_state;
 			markDirtyAndDispatch();
 		}
 	}
 
 	/* --------------------------------------------------- ADDONS --------------------------------------------------- */
 	public boolean emitsLight() {
-		return (bitfield & LIGHT_MASK) != 0;
+		return (bit_field & LIGHT_MASK) != 0;
 	}
 	
 	public void toggleLight() {
-		bitfield |= emitsLight() ? ~LIGHT_MASK: LIGHT_MASK;
+		if (emitsLight()) bit_field &= ~LIGHT_MASK;
+		else bit_field |= LIGHT_MASK;
 		markDirtyAndDispatch();
 	}
 	
 	public void toggleRedstone() {
-		bitfield |= emitsRedstone() ? ~REDSTONE_MASK: REDSTONE_MASK;
+		if (emitsRedstone()) bit_field &= ~REDSTONE_MASK;
+		else bit_field |= REDSTONE_MASK;
 
 		if(world != null) world.updateNeighbors(pos, getCachedState().getBlock());
 		markDirtyAndDispatch();
 	}
 
 	public boolean emitsRedstone() {
-		return (bitfield & REDSTONE_MASK) != 0;
+		return (bit_field & REDSTONE_MASK) != 0;
 	}
 	
 	public void toggleSolidity() {
-		bitfield |= isSolid() ? ~SOLIDITY_MASK: SOLIDITY_MASK;
+		if (isSolid()) bit_field &= ~SOLIDITY_MASK;
+		else bit_field |= SOLIDITY_MASK;
 
 		if(world != null) world.setBlockState(pos, getCachedState());
 		markDirtyAndDispatch();
 	}
 	
 	public boolean isSolid() {
-		return (bitfield & SOLIDITY_MASK) != 0;
+		return (bit_field & SOLIDITY_MASK) != 0;
 	}
 
 	@Nullable

src/main/java/fr/adrien1106/reframed/block/ReFramedSlabBlock.java

@@ -1,11 +1,15 @@
 package fr.adrien1106.reframed.block;
 
+import fr.adrien1106.reframed.ReFramed;
+import fr.adrien1106.reframed.generator.GBlockstate;
 import fr.adrien1106.reframed.generator.MultipartBlockStateProvider;
-import net.minecraft.block.*;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.ShapeContext;
 import net.minecraft.data.client.MultipartBlockStateSupplier;
 import net.minecraft.item.ItemPlacementContext;
 import net.minecraft.state.StateManager;
-import net.minecraft.state.property.Properties;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.shape.VoxelShape;
@@ -13,34 +17,37 @@ import net.minecraft.util.shape.VoxelShapes;
 import net.minecraft.world.BlockView;
 import org.jetbrains.annotations.Nullable;
 
+import static net.minecraft.data.client.VariantSettings.Rotation.*;
+import static net.minecraft.state.property.Properties.FACING;
+
 public class ReFramedSlabBlock extends WaterloggableReFramedBlock implements MultipartBlockStateProvider {
 
-	private static final VoxelShape DOWN = VoxelShapes.cuboid(0f, 0f, 0f, 1f, 0.5f, 1f);
-	private static final VoxelShape UP = VoxelShapes.cuboid(0f, 0.5f, 0f, 1f, 1f, 1f);
-	private static final VoxelShape NORTH = VoxelShapes.cuboid(0f, 0f, 0f, 1f, 1f, 0.5f);
-	private static final VoxelShape SOUTH = VoxelShapes.cuboid(0f, 0f, 0.5f, 1f, 1f, 1f);
-	private static final VoxelShape EAST = VoxelShapes.cuboid(0.5f, 0f, 0f, 1f, 1f, 1f);
-	private static final VoxelShape WEST = VoxelShapes.cuboid(0f, 0f, 0f, 0.5f, 1f, 1f);
+	protected static final VoxelShape DOWN = VoxelShapes.cuboid(0f, 0f, 0f, 1f, 0.5f, 1f);
+	protected static final VoxelShape UP = VoxelShapes.cuboid(0f, 0.5f, 0f, 1f, 1f, 1f);
+	protected static final VoxelShape NORTH = VoxelShapes.cuboid(0f, 0f, 0f, 1f, 1f, 0.5f);
+	protected static final VoxelShape SOUTH = VoxelShapes.cuboid(0f, 0f, 0.5f, 1f, 1f, 1f);
+	protected static final VoxelShape EAST = VoxelShapes.cuboid(0.5f, 0f, 0f, 1f, 1f, 1f);
+	protected static final VoxelShape WEST = VoxelShapes.cuboid(0f, 0f, 0f, 0.5f, 1f, 1f);
 
 	public ReFramedSlabBlock(Settings settings) {
 		super(settings);
-		setDefaultState(getDefaultState().with(Properties.FACING, Direction.DOWN));
+		setDefaultState(getDefaultState().with(FACING, Direction.DOWN));
 	}
 	
 	@Override
 	protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
-		super.appendProperties(builder.add(Properties.FACING));
+		super.appendProperties(builder.add(FACING));
 	}
 	
 	@Nullable
 	@Override
 	public BlockState getPlacementState(ItemPlacementContext ctx) {
-		return super.getPlacementState(ctx).with(Properties.FACING, ctx.getSide().getOpposite());
+		return super.getPlacementState(ctx).with(FACING, ctx.getSide().getOpposite());
 	}
 
 	@Override
 	public VoxelShape getOutlineShape(BlockState state, BlockView world, BlockPos pos, ShapeContext context) {
-		return switch (state.get(Properties.FACING)) {
+		return switch (state.get(FACING)) {
 			case DOWN -> DOWN;
 			case UP -> UP;
 			case NORTH -> NORTH;
@@ -52,6 +59,19 @@ public class ReFramedSlabBlock extends WaterloggableReFramedBlock implements Mul
 
 	@Override
 	public MultipartBlockStateSupplier getMultipart() {
-		return null;
+		Identifier model_id = ReFramed.id("slab_special");
+		return MultipartBlockStateSupplier.create(this)
+			.with(GBlockstate.when(FACING, Direction.DOWN),
+				GBlockstate.variant(model_id, true, R0, R0))
+			.with(GBlockstate.when(FACING, Direction.SOUTH),
+				GBlockstate.variant(model_id, true, R90, R0))
+			.with(GBlockstate.when(FACING, Direction.UP),
+				GBlockstate.variant(model_id, true, R180, R0))
+			.with(GBlockstate.when(FACING, Direction.NORTH),
+				GBlockstate.variant(model_id, true, R270, R0))
+			.with(GBlockstate.when(FACING, Direction.WEST),
+				GBlockstate.variant(model_id, true, R90, R90))
+			.with(GBlockstate.when(FACING, Direction.EAST),
+				GBlockstate.variant(model_id, true, R90, R270));
 	}
 }

src/main/java/fr/adrien1106/reframed/block/WaterloggableReFramedBlock.java

@@ -16,7 +16,6 @@ import org.jetbrains.annotations.Nullable;
 public class WaterloggableReFramedBlock extends ReFramedBlock implements Waterloggable {
 	public WaterloggableReFramedBlock(Settings settings) {
 		super(settings);
-		
 		setDefaultState(getDefaultState().with(Properties.WATERLOGGED, false));
 	}
 	

src/main/java/fr/adrien1106/reframed/client/ReFramedClient.java

@@ -53,6 +53,7 @@ public class ReFramedClient implements ClientModInitializer {
 		HELPER.addReFramedModel(ReFramed.id("pressure_plate_up_special")    , HELPER.auto(new Identifier("block/pressure_plate_up")));
 		HELPER.addReFramedModel(ReFramed.id("pressure_plate_down_special")  , HELPER.auto(new Identifier("block/pressure_plate_down")));
 		HELPER.addReFramedModel(ReFramed.id("slab_special")                 , HELPER.auto(new Identifier("block/slab")));
+		HELPER.addReFramedModel(ReFramed.id("double_slab_special")          , HELPER.autoDouble(new Identifier("block/slab"), new Identifier("block/slab_top")));
 		HELPER.addReFramedModel(ReFramed.id("stairs_special")               , HELPER.auto(ReFramed.id("block/stairs")));
 		HELPER.addReFramedModel(ReFramed.id("double_outer_stairs_special")  , HELPER.auto(ReFramed.id("block/double_outer_stairs")));
 		HELPER.addReFramedModel(ReFramed.id("inner_stairs_special")         , HELPER.auto(ReFramed.id("block/inner_stairs")));
@@ -89,6 +90,7 @@ public class ReFramedClient implements ClientModInitializer {
 		HELPER.assignItemModel(ReFramed.id("fence_post_inventory_special")  , ReFramed.POST);
 		HELPER.assignItemModel(ReFramed.id("pressure_plate_up_special")     , ReFramed.PRESSURE_PLATE);
 		HELPER.assignItemModel(ReFramed.id("slab_special")                  , ReFramed.SLAB);
+		HELPER.assignItemModel(ReFramed.id("double_slab_special")           , ReFramed.DOUBLE_SLAB);
 		HELPER.assignItemModel(ReFramed.id("stairs_special")                , ReFramed.STAIRS);
 		HELPER.assignItemModel(ReFramed.id("trapdoor_bottom_special")       , ReFramed.TRAPDOOR);
 		HELPER.assignItemModel(ReFramed.id("wall_inventory_special")        , ReFramed.WALL);

src/main/java/fr/adrien1106/reframed/client/ReFramedClientHelper.java

@@ -1,13 +1,13 @@
 package fr.adrien1106.reframed.client;
 
-import fr.adrien1106.reframed.client.model.apperance.CamoAppearanceManager;
 import fr.adrien1106.reframed.client.model.UnbakedAutoRetexturedModel;
+import fr.adrien1106.reframed.client.model.UnbakedDoubleRetexturedModel;
 import fr.adrien1106.reframed.client.model.UnbakedJsonRetexturedModel;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.client.model.UnbakedRetexturedModel;
+import fr.adrien1106.reframed.client.model.apperance.CamoAppearanceManager;
 import net.fabricmc.fabric.api.renderer.v1.Renderer;
 import net.fabricmc.fabric.api.renderer.v1.RendererAccess;
 import net.fabricmc.loader.api.FabricLoader;
-import net.minecraft.block.BlockState;
 import net.minecraft.client.render.model.UnbakedModel;
 import net.minecraft.client.texture.Sprite;
 import net.minecraft.client.util.SpriteIdentifier;
@@ -25,20 +25,17 @@ public class ReFramedClientHelper {
 
 	private final ReFramedModelProvider prov;
 
-	public UnbakedModel auto(Identifier parent) {
-		return auto(parent, ThemeableBlockEntity::getFirstTheme);
+
+	public UnbakedRetexturedModel auto(Identifier parent) {
+		return new UnbakedAutoRetexturedModel(parent);
 	}
 
-	public UnbakedModel auto(Identifier parent, Function<ThemeableBlockEntity, BlockState> state_getter) {
-		return new UnbakedAutoRetexturedModel(parent, state_getter);
+	public UnbakedRetexturedModel json(Identifier parent) {
+		return new UnbakedJsonRetexturedModel(parent);
 	}
 
-	public UnbakedModel json(Identifier parent) {
-		return json(parent, ThemeableBlockEntity::getFirstTheme);
-	}
-
-	public UnbakedModel json(Identifier parent, Function<ThemeableBlockEntity, BlockState> state_getter) {
-		return new UnbakedJsonRetexturedModel(parent, state_getter);
+	public UnbakedModel autoDouble(Identifier first, Identifier second) {
+		return new UnbakedDoubleRetexturedModel(auto(first), auto(second));
 	}
 
 	public void addReFramedModel(Identifier id, UnbakedModel unbaked) {

src/main/java/fr/adrien1106/reframed/client/ReFramedModelProvider.java

@@ -37,9 +37,9 @@ public class ReFramedModelProvider implements ModelResourceProvider, ModelVarian
 	//but json models are never allowed to have non-json models as a parent, and frame unbaked models are not json models. Ah well.
 	//So, instead, we use a ModelVariantProvider to redirect attempts to load the item:id#inventory model.
 	@Override
-	public @Nullable UnbakedModel loadModelVariant(ModelIdentifier modelId, ModelProviderContext context) {
-		Identifier customModelId = itemAssignments.get(modelId);
-		return customModelId == null ? null : loadModelResource(customModelId, context);
+	public @Nullable UnbakedModel loadModelVariant(ModelIdentifier model, ModelProviderContext context) {
+		Identifier custom_model = itemAssignments.get(model);
+		return custom_model == null ? null : loadModelResource(custom_model, context);
 	}
 	
 	/// camo appearance manager cache

src/main/java/fr/adrien1106/reframed/client/model/DoubleRetexturingBakedModel.java

@@ -1,20 +1,26 @@
 package fr.adrien1106.reframed.client.model;
 
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
 import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
 import net.fabricmc.fabric.api.renderer.v1.render.RenderContext;
 import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.texture.Sprite;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.random.Random;
 import net.minecraft.world.BlockRenderView;
 
+import java.util.List;
 import java.util.function.Supplier;
 
-public class DoubleRetexturingBakedModel extends ForwardingBakedModel {
+@Environment(EnvType.CLIENT)
+public class DoubleRetexturingBakedModel extends ForwardingBakedModel implements MultiRetexturableModel {
 
     private final ForwardingBakedModel model_1, model_2;
     public DoubleRetexturingBakedModel(ForwardingBakedModel model_1, ForwardingBakedModel model_2) {
+        this.wrapped = model_1.getWrappedModel();
         this.model_1 = model_1;
         this.model_2 = model_2;
     }
@@ -26,18 +32,20 @@ public class DoubleRetexturingBakedModel extends ForwardingBakedModel {
 
     @Override
     public Sprite getParticleSprite() {
-        return model_1.getParticleSprite(); // TODO determine which face is on top
+        return model_1.getParticleSprite();
     }
 
     @Override
-    public void emitBlockQuads(BlockRenderView world, BlockState state, BlockPos pos, Supplier<Random> randomSupplier, RenderContext context) {
-        model_1.emitBlockQuads(world, state, pos, randomSupplier, context);
-        model_2.emitBlockQuads(world, state, pos, randomSupplier, context);
-    }
+    public void emitBlockQuads(BlockRenderView world, BlockState state, BlockPos pos, Supplier<Random> randomSupplier, RenderContext context) {}
 
-    @Override
+    @Override // models are emitted here because no checks are done on items
     public void emitItemQuads(ItemStack stack, Supplier<Random> randomSupplier, RenderContext context) {
         model_1.emitItemQuads(stack, randomSupplier, context);
         model_2.emitItemQuads(stack, randomSupplier, context);
     }
+
+    @Override
+    public List<BakedModel> models() {
+        return List.of(model_1, model_2);
+    }
 }

src/main/java/fr/adrien1106/reframed/client/model/MeshTransformUtil.java

@@ -1,83 +0,0 @@
-package fr.adrien1106.reframed.client.model;
-
-import fr.adrien1106.reframed.client.ReFramedClient;
-import net.fabricmc.fabric.api.renderer.v1.mesh.Mesh;
-import net.fabricmc.fabric.api.renderer.v1.mesh.MeshBuilder;
-import net.fabricmc.fabric.api.renderer.v1.mesh.QuadEmitter;
-import net.fabricmc.fabric.api.renderer.v1.render.RenderContext;
-import net.minecraft.client.render.model.ModelBakeSettings;
-import net.minecraft.util.math.Direction;
-import org.joml.Matrix4f;
-import org.joml.Vector3f;
-import org.joml.Vector4f;
-
-import java.util.EnumMap;
-import java.util.Map;
-
-public class MeshTransformUtil {
-	public static Mesh pretransformMesh(Mesh mesh, RetexturingBakedModel.RetexturingTransformer transform) {
-		MeshBuilder builder = ReFramedClient.HELPER.getFabricRenderer().meshBuilder();
-		QuadEmitter emitter = builder.getEmitter();
-		
-		mesh.forEach(quad -> {
-			int i = -1;
-			do {
-				emitter.copyFrom(quad);
-				i = transform.transform(emitter, i);
-			} while (i > 0);
-		});
-		
-		return builder.build();
-	}
-	
-	public static Map<Direction, Direction> facePermutation(Matrix4f mat) {
-		Map<Direction, Direction> facePermutation = new EnumMap<>(Direction.class);
-		for(Direction input : Direction.values()) {
-			Direction output = Direction.transform(mat, input);
-			facePermutation.put(input, output);
-		}
-		return facePermutation;
-	}
-	
-	public static RenderContext.QuadTransform applyAffine(ModelBakeSettings settings) {
-		return applyMatrix(settings.getRotation().getMatrix());
-	}
-	
-	public static RenderContext.QuadTransform applyMatrix(Matrix4f mat) {
-		Map<Direction, Direction> facePermutation = facePermutation(mat);
-		Vector3f pos3 = new Vector3f();
-		Vector4f pos4 = new Vector4f();
-		
-		return quad -> {
-			//For each vertex:
-			for(int i = 0; i < 4; i++) {
-				//Copy pos into a vec3, then a vec4. the w component is set to 0 since this is a point, not a normal
-				quad.copyPos(i, pos3);
-				pos3.add(-0.5f, -0.5f, -0.5f);
-				pos4.set(pos3, 0);
-				
-				//Compute the matrix-vector product. This function mutates the vec4 in-place.
-				//Note that `transformAffine` has the same purpose as `transform`; the difference is it
-				//assumes (without checking) that the last row of the matrix is 0,0,0,1, as an optimization
-				mat.transform(pos4);
-				
-				//Manually copy the data back onto the vertex
-				quad.pos(i, pos4.x + 0.5f, pos4.y + 0.5f, pos4.z + 0.5f);
-			}
-			
-			//permute tags
-			int tag = quad.tag();
-			if(tag != 0) quad.tag(facePermutation.get(RetexturingBakedModel.DIRECTIONS[tag - 1]).ordinal() + 1);
-			
-			//permute lighting face (?)
-			quad.nominalFace(facePermutation.get(quad.lightFace()));
-			
-			//permute cullface
-			Direction cull = quad.cullFace();
-			if(cull != null) quad.cullFace(facePermutation.get(cull));
-			
-			//Output the quad
-			return true;
-		};
-	}
-}

src/main/java/fr/adrien1106/reframed/client/model/MultiRetexturableModel.java

@@ -0,0 +1,10 @@
+package fr.adrien1106.reframed.client.model;
+
+import net.minecraft.client.render.model.BakedModel;
+
+import java.util.List;
+
+public interface MultiRetexturableModel {
+
+    List<BakedModel> models();
+}

src/main/java/fr/adrien1106/reframed/client/model/RetexturingBakedModel.java

@@ -1,6 +1,7 @@
 package fr.adrien1106.reframed.client.model;
 
 import fr.adrien1106.reframed.block.ReFramedEntity;
+import fr.adrien1106.reframed.client.ReFramedClient;
 import fr.adrien1106.reframed.client.model.apperance.SpriteProperties;
 import fr.adrien1106.reframed.mixin.MinecraftAccessor;
 import fr.adrien1106.reframed.client.model.apperance.CamoAppearance;
@@ -8,6 +9,7 @@ import fr.adrien1106.reframed.client.model.apperance.CamoAppearanceManager;
 import fr.adrien1106.reframed.client.model.apperance.WeightedComputedAppearance;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.fabricmc.fabric.api.renderer.v1.mesh.Mesh;
+import net.fabricmc.fabric.api.renderer.v1.mesh.MeshBuilder;
 import net.fabricmc.fabric.api.renderer.v1.mesh.MutableQuadView;
 import net.fabricmc.fabric.api.renderer.v1.mesh.QuadEmitter;
 import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
@@ -27,39 +29,41 @@ import net.minecraft.world.BlockRenderView;
 import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import java.util.function.Function;
 import java.util.function.Supplier;
 
 public abstract class RetexturingBakedModel extends ForwardingBakedModel {
-	public RetexturingBakedModel(BakedModel baseModel, CamoAppearanceManager tam, Function<ThemeableBlockEntity, BlockState> state_getter, ModelBakeSettings settings, BlockState itemModelState, boolean ao) {
-		this.wrapped = baseModel; //field from the superclass; vanilla getQuads etc. will delegate through to this
-		
+	public RetexturingBakedModel(BakedModel base_model, CamoAppearanceManager tam, int theme_index, ModelBakeSettings settings, BlockState item_state, boolean ao) {
+		this.wrapped = base_model; //field from the superclass; vanilla getQuads etc. will delegate through to this
+
 		this.tam = tam;
-		this.state_getter = state_getter;
-		this.uvlock = settings.isUvLocked();
-		this.itemModelState = itemModelState;
+		this.theme_index = theme_index;
+		this.uv_lock = settings.isUvLocked();
+		this.item_state = item_state;
 		this.ao = ao;
 	}
 
 	protected final CamoAppearanceManager tam;
-	protected final Function<ThemeableBlockEntity, BlockState> state_getter;
-	protected final boolean uvlock;
-	protected final BlockState itemModelState;
+	protected final int theme_index;
+	protected final boolean uv_lock;
+	protected final BlockState item_state;
 	protected final boolean ao;
-	
+
+	/* ----------------------------------------------- CACHE ELEMENT ------------------------------------------------ */
+	// TODO make static ? for connected textures ?
 	protected record MeshCacheKey(BlockState state, TransformCacheKey transform) {}
-	protected final ConcurrentMap<MeshCacheKey, Mesh> retextured_meshes = new ConcurrentHashMap<>(); //mutable, append-only cache
 	protected record TransformCacheKey(CamoAppearance appearance, int model_id) {}
 	protected final ConcurrentMap<TransformCacheKey, RetexturingTransformer> retextured_transforms = new ConcurrentHashMap<>();
-	
-	protected static final Direction[] DIRECTIONS = Direction.values();
-	protected static final Direction[] DIRECTIONS_AND_NULL = new Direction[DIRECTIONS.length + 1];
-	static { System.arraycopy(DIRECTIONS, 0, DIRECTIONS_AND_NULL, 0, DIRECTIONS.length); }
+	protected final ConcurrentMap<MeshCacheKey, Mesh> retextured_meshes = new ConcurrentHashMap<>(); //mutable, append-only cache
 
+	protected static final Direction[] DIRECTIONS_AND_NULL;
+	static {
+		Direction[] values = Direction.values();
+		DIRECTIONS_AND_NULL = new Direction[values.length + 1];
+		System.arraycopy(values, 0, DIRECTIONS_AND_NULL, 0, values.length);
+	}
 
 	protected final ConcurrentMap<BlockState, Mesh> jsonToMesh = new ConcurrentHashMap<>();
 
-
 	protected Mesh getBaseMesh(BlockState state) {
 		//Convert models to re-texturable Meshes lazily, the first time we encounter each blockstate
 		return jsonToMesh.computeIfAbsent(state, this::convertModel);
@@ -74,15 +78,15 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 	
 	@Override
 	public Sprite getParticleSprite() {
-		return tam.getDefaultAppearance().getSprites(Direction.UP, 0).get(0).sprite();
+		return tam.getDefaultAppearance(theme_index).getSprites(Direction.UP, 0).get(0).sprite();
 	}
 	
 	@Override
 	public void emitBlockQuads(BlockRenderView world, BlockState state, BlockPos pos, Supplier<Random> randomSupplier, RenderContext context) {
-		BlockState theme = (world.getBlockEntity(pos) instanceof ThemeableBlockEntity s) ? state_getter.apply(s) : null;
+		BlockState theme = (world.getBlockEntity(pos) instanceof ThemeableBlockEntity s) ? s.getTheme(theme_index) : null;
 		QuadEmitter quad_emitter = context.getEmitter();
 		if(theme == null || theme.isAir()) {
-			getUntintedRetexturedMesh(new MeshCacheKey(state, new TransformCacheKey(tam.getDefaultAppearance(), 0)), 0).outputTo(quad_emitter);
+			getUntintedRetexturedMesh(new MeshCacheKey(state, new TransformCacheKey(tam.getDefaultAppearance(theme_index), 0)), 0).outputTo(quad_emitter);
 			return;
 		}
 		if(theme.getBlock() == Blocks.BARRIER) return;
@@ -118,16 +122,16 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 		//none of this is accessible unless you're in creative mode doing ctrl-pick btw
 		CamoAppearance nbtAppearance;
 		int tint;
-		BlockState theme = ReFramedEntity.readStateFromItem(stack); // TODO Different states for both models
+		BlockState theme = ReFramedEntity.readStateFromItem(stack, theme_index);
 		if(!theme.isAir()) {
 			nbtAppearance = tam.getCamoAppearance(null, theme, null);
 			tint = 0xFF000000 | ((MinecraftAccessor) MinecraftClient.getInstance()).getItemColors().getColor(new ItemStack(theme.getBlock()), 0);
 		} else {
-			nbtAppearance = tam.getDefaultAppearance();
+			nbtAppearance = tam.getDefaultAppearance(theme_index);
 			tint = 0xFFFFFFFF;
 		}
 		
-		Mesh untintedMesh = getUntintedRetexturedMesh(new MeshCacheKey(itemModelState, new TransformCacheKey(nbtAppearance, 0)), 0);
+		Mesh untintedMesh = getUntintedRetexturedMesh(new MeshCacheKey(item_state, new TransformCacheKey(nbtAppearance, 0)), 0);
 
 		QuadEmitter quad_emitter = context.getEmitter();
 		if(tint == 0xFFFFFFFF) {
@@ -145,7 +149,22 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 	
 	protected Mesh createUntintedRetexturedMesh(MeshCacheKey key, long seed) {
 		RetexturingTransformer transformer = retextured_transforms.computeIfAbsent(key.transform, (k) -> new RetexturingTransformer(k.appearance, seed));
-		return MeshTransformUtil.pretransformMesh(getBaseMesh(key.state), transformer);
+		return pretransformMesh(getBaseMesh(key.state), transformer);
+	}
+
+	private static Mesh pretransformMesh(Mesh mesh, RetexturingTransformer transform) {
+		MeshBuilder builder = ReFramedClient.HELPER.getFabricRenderer().meshBuilder();
+		QuadEmitter emitter = builder.getEmitter();
+
+		mesh.forEach(quad -> {
+			int i = -1;
+			do {
+				emitter.copyFrom(quad);
+				i = transform.transform(emitter, i);
+			} while (i > 0);
+		});
+
+		return builder.build();
 	}
 	
 	public class RetexturingTransformer {
@@ -174,7 +193,7 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 					properties.sprite(),
 					MutableQuadView.BAKE_NORMALIZED
 						| properties.flags()
-						| (uvlock ? MutableQuadView.BAKE_LOCK_UV : 0)
+						| (uv_lock ? MutableQuadView.BAKE_LOCK_UV : 0)
 				);
 				quad.tag(i+1);
 				quad.emit();
@@ -188,7 +207,7 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 			// apply new quad shape
 			quad.material(ta.getRenderMaterial(ao));
 			bounds.intersection(origin_bounds, direction.getAxis()).apply(quad, origin_bounds);
-			quad.spriteBake( // TODO check if the flags are usefull because it seems to be braking the functioning of it
+			quad.spriteBake( // seems to work without the flags and break with it
 				properties.sprite(),
 				MutableQuadView.BAKE_NORMALIZED
 					| MutableQuadView.BAKE_LOCK_UV

src/main/java/fr/adrien1106/reframed/client/model/UnbakedAutoRetexturedModel.java

@@ -1,7 +1,6 @@
 package fr.adrien1106.reframed.client.model;
 
 import fr.adrien1106.reframed.client.ReFramedClient;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.fabricmc.fabric.api.renderer.v1.Renderer;
 import net.fabricmc.fabric.api.renderer.v1.material.RenderMaterial;
 import net.fabricmc.fabric.api.renderer.v1.mesh.Mesh;
@@ -24,8 +23,8 @@ import java.util.function.Function;
 
 public class UnbakedAutoRetexturedModel extends UnbakedRetexturedModel {
 
-	public UnbakedAutoRetexturedModel(Identifier parent, Function<ThemeableBlockEntity, BlockState> state_getter) {
-		super(parent, state_getter);
+	public UnbakedAutoRetexturedModel(Identifier parent) {
+		super(parent);
 		item_state = Blocks.AIR.getDefaultState();
 	}
 	
@@ -35,7 +34,7 @@ public class UnbakedAutoRetexturedModel extends UnbakedRetexturedModel {
 		return new RetexturingBakedModel(
 			baker.bake(parent, bake_settings),
 			ReFramedClient.HELPER.getCamoApperanceManager(texture_getter),
-			state_getter,
+			theme_index,
 			bake_settings,
 			item_state,
 			ao

src/main/java/fr/adrien1106/reframed/client/model/UnbakedDoubleRetexturedModel.java

@@ -19,15 +19,16 @@ public class UnbakedDoubleRetexturedModel implements UnbakedModel {
     protected final UnbakedModel model_1;
     protected final UnbakedModel model_2;
 
-    public UnbakedDoubleRetexturedModel(UnbakedModel model_1, UnbakedModel model_2) {
+    public UnbakedDoubleRetexturedModel(UnbakedRetexturedModel model_1, UnbakedRetexturedModel model_2) {
         this.model_1 = model_1;
         this.model_2 = model_2;
+        model_2.setThemeIndex(2);
     }
 
 
     @Override
     public Collection<Identifier> getModelDependencies() {
-        return List.of(model_1.getModelDependencies().iterator().next(), model_2.getModelDependencies().iterator().next());
+        return List.of(((List<Identifier>) model_1.getModelDependencies()).get(0), ((List<Identifier>) model_2.getModelDependencies()).get(0));
     }
 
     @Override

src/main/java/fr/adrien1106/reframed/client/model/UnbakedJsonRetexturedModel.java

@@ -2,7 +2,6 @@ package fr.adrien1106.reframed.client.model;
 
 import fr.adrien1106.reframed.ReFramed;
 import fr.adrien1106.reframed.client.ReFramedClient;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.fabricmc.fabric.api.renderer.v1.Renderer;
 import net.fabricmc.fabric.api.renderer.v1.material.RenderMaterial;
 import net.fabricmc.fabric.api.renderer.v1.mesh.Mesh;
@@ -25,25 +24,25 @@ import java.util.Objects;
 import java.util.function.Function;
 
 public class UnbakedJsonRetexturedModel extends UnbakedRetexturedModel {
-	public UnbakedJsonRetexturedModel(Identifier parent, Function<ThemeableBlockEntity, BlockState> state_getter) {
-        super(parent, state_getter);
+	public UnbakedJsonRetexturedModel(Identifier parent) {
+        super(parent);
 	}
 	
 	@Nullable
 	@Override
 	public BakedModel bake(Baker baker, Function<SpriteIdentifier, Sprite> spriteLookup, ModelBakeSettings bake_settings, Identifier identifier) {
-		Direction[] DIRECTIONS = RetexturingBakedModel.DIRECTIONS;
+		Direction[] directions = Direction.values();
 		
-		Sprite[] specialSprites = new Sprite[DIRECTIONS.length];
-		for(int i = 0; i < DIRECTIONS.length; i++) {
-			SpriteIdentifier id = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, ReFramed.id("reframed_special/" + DIRECTIONS[i].getName()));
-			specialSprites[i] = Objects.requireNonNull(spriteLookup.apply(id), () -> "Couldn't find sprite " + id + " !");
+		Sprite[] sprites = new Sprite[directions.length];
+		for(int i = 0; i < directions.length; i++) {
+			SpriteIdentifier id = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, ReFramed.id("reframed_special/" + directions[i].getName()));
+			sprites[i] = Objects.requireNonNull(spriteLookup.apply(id), () -> "Couldn't find sprite " + id + " !");
 		}
 
 		return new RetexturingBakedModel(
 			baker.bake(parent, bake_settings),
 			ReFramedClient.HELPER.getCamoApperanceManager(spriteLookup),
-			state_getter,
+			theme_index,
 			bake_settings,
 			item_state,
 			ao
@@ -61,9 +60,9 @@ public class UnbakedJsonRetexturedModel extends UnbakedRetexturedModel {
 						emitter.fromVanilla(quad, mat, cullFace);
 						
 						QuadUvBounds bounds = QuadUvBounds.read(emitter);
-						for(int i = 0; i < specialSprites.length; i++) {
-							if(bounds.displaysSprite(specialSprites[i])) {
-								bounds.normalizeUv(emitter, specialSprites[i]);
+						for(int i = 0; i < sprites.length; i++) {
+							if(bounds.displaysSprite(sprites[i])) {
+								bounds.normalizeUv(emitter, sprites[i]);
 								emitter.tag(i + 1);
 								break;
 							}

src/main/java/fr/adrien1106/reframed/client/model/UnbakedRetexturedModel.java

@@ -1,6 +1,5 @@
 package fr.adrien1106.reframed.client.model;
 
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.client.render.model.UnbakedModel;
 import net.minecraft.util.Identifier;
@@ -12,14 +11,17 @@ import java.util.function.Function;
 public abstract class UnbakedRetexturedModel implements UnbakedModel {
 
     protected final Identifier parent;
-    protected final Function<ThemeableBlockEntity, BlockState> state_getter;
 
+    protected int theme_index = 1;
     protected BlockState item_state;
     protected boolean ao = true;
 
-    public UnbakedRetexturedModel(Identifier parent, Function<ThemeableBlockEntity, BlockState> state_getter) {
+    public UnbakedRetexturedModel(Identifier parent) {
         this.parent = parent;
-        this.state_getter = state_getter;
+    }
+
+    public void setThemeIndex(int theme_index) {
+        this.theme_index = theme_index;
     }
 
     @Override

src/main/java/fr/adrien1106/reframed/client/model/apperance/CamoAppearanceManager.java

@@ -44,29 +44,34 @@ public class CamoAppearanceManager {
 			materialsWithAo.put(blend, finder.ambientOcclusion(TriState.DEFAULT).find()); //not "true" since that *forces* AO, i just want to *allow* AO
 		}
 		
-		Sprite defaultSprite = spriteLookup.apply(DEFAULT_SPRITE_ID);
-		if(defaultSprite == null) throw new IllegalStateException("Couldn't locate " + DEFAULT_SPRITE_ID + " !");
-		this.defaultAppearance = new SingleSpriteAppearance(defaultSprite, materialsWithoutAo.get(BlendMode.CUTOUT), serialNumber.getAndIncrement());
-		
-		Sprite barrier = spriteLookup.apply(BARRIER_SPRITE_ID);
-		if(barrier == null) barrier = defaultSprite; //eh
-		this.barrierItemAppearance = new SingleSpriteAppearance(barrier, materialsWithoutAo.get(BlendMode.CUTOUT), serialNumber.getAndIncrement());
+		Sprite sprite = spriteLookup.apply(DEFAULT_SPRITE_MAIN);
+		if(sprite == null) throw new IllegalStateException("Couldn't locate " + DEFAULT_SPRITE_MAIN + " !");
+		this.default_appearance = new SingleSpriteAppearance(sprite, materialsWithoutAo.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
+
+		sprite = spriteLookup.apply(DEFAULT_SPRITE_SECONDARY);
+		if(sprite == null) throw new IllegalStateException("Couldn't locate " + DEFAULT_SPRITE_MAIN + " !");
+		this.accent_appearance = new SingleSpriteAppearance(sprite, materialsWithoutAo.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
+
+		sprite = spriteLookup.apply(BARRIER_SPRITE_ID);
+		this.barrierItemAppearance = new SingleSpriteAppearance(sprite, materialsWithoutAo.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
 	}
 
-	protected static final SpriteIdentifier DEFAULT_SPRITE_ID = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, new Identifier(ReFramed.MODID, "block/framed_block"));
+	protected static final SpriteIdentifier DEFAULT_SPRITE_MAIN = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, new Identifier(ReFramed.MODID, "block/framed_block"));
+	protected static final SpriteIdentifier DEFAULT_SPRITE_SECONDARY = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, new Identifier(ReFramed.MODID, "block/framed_accent_block"));
 	private static final SpriteIdentifier BARRIER_SPRITE_ID = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, new Identifier("minecraft:item/barrier"));
 	
-	private final CamoAppearance defaultAppearance;
+	private final CamoAppearance default_appearance;
+	private final CamoAppearance accent_appearance;
 	private final CamoAppearance barrierItemAppearance;
 	
 	private final ConcurrentHashMap<BlockState, CamoAppearance> appearanceCache = new ConcurrentHashMap<>(); //Mutable, append-only cache
-	private final AtomicInteger serialNumber = new AtomicInteger(0); //Mutable
+	private final AtomicInteger serial_number = new AtomicInteger(0); //Mutable
 	
 	private final EnumMap<BlendMode, RenderMaterial> materialsWithAo = new EnumMap<>(BlendMode.class);
 	private final EnumMap<BlendMode, RenderMaterial> materialsWithoutAo = new EnumMap<>(BlendMode.class); //Immutable contents
 	
-	public CamoAppearance getDefaultAppearance() {
-		return defaultAppearance;
+	public CamoAppearance getDefaultAppearance(int appearance) {
+		return appearance == 2 ? accent_appearance: default_appearance;
 	}
 	
 	public CamoAppearance getCamoAppearance(BlockRenderView world, BlockState state, BlockPos pos) {
@@ -96,7 +101,7 @@ public class CamoAppearanceManager {
 				getAppearance(model),
 				getCachedMaterial(state, true),
 				getCachedMaterial(state, false),
-				serialNumber.getAndIncrement()
+				serial_number.getAndIncrement()
 			);
 		}
 		List<Weighted.Present<Appearance>> appearances = weighted_model.getModels().stream()
@@ -107,7 +112,7 @@ public class CamoAppearanceManager {
 			appearances,
 			getCachedMaterial(state, true),
 			getCachedMaterial(state, false),
-			serialNumber.getAndIncrement()
+			serial_number.getAndIncrement()
 		);
 	}
 
@@ -124,7 +129,7 @@ public class CamoAppearanceManager {
 		Arrays.stream(Direction.values()).forEach(direction -> {
 			List<BakedQuad> quads = model.getQuads(null, direction, random);
 			if(quads.isEmpty()) { // add default appearance if none present
-				sprites.put(direction, defaultAppearance.getSprites(direction, 0));
+				sprites.put(direction, default_appearance.getSprites(direction, 0));
 				return;
 			}
 

src/main/java/fr/adrien1106/reframed/generator/Generator.java

@@ -13,7 +13,7 @@ public class Generator implements DataGeneratorEntrypoint {
     /**
      *  missing DOOR, IRON_DOOR, CANDLE
      */
-    public static List<Block> BLOCKS = List.of(CUBE, STAIRS, SLAB, POST, FENCE, FENCE_GATE, TRAPDOOR, IRON_TRAPDOOR, PRESSURE_PLATE, BUTTON, LEVER, WALL, CARPET, PANE);
+    public static List<Block> BLOCKS = List.of(CUBE, STAIRS, SLAB, DOUBLE_SLAB, POST, FENCE, FENCE_GATE, TRAPDOOR, IRON_TRAPDOOR, PRESSURE_PLATE, BUTTON, LEVER, WALL, CARPET, PANE);
     @Override
     public void onInitializeDataGenerator(FabricDataGenerator data_generator) {
         FabricDataGenerator.Pack myPack = data_generator.createPack();

src/main/java/fr/adrien1106/reframed/mixin/compat/AthenaWrappedGetterMixin.java

@@ -16,12 +16,13 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 @Mixin(WrappedGetter.class)
 public class AthenaWrappedGetterMixin {
 
+    // TODO return only the state that might be of interest
     @Shadow @Final private BlockRenderView getter;
 
     @Inject(method = "getBlockState", at = @At(value = "HEAD"), cancellable = true)
     private void getCamoState(BlockPos pos, CallbackInfoReturnable<BlockState> cir) {
         if (!(getter.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity)) return;
-        cir.setReturnValue(framed_entity.getFirstTheme());
+        cir.setReturnValue(framed_entity.getTheme(1)); // TODO theme
     }
 
     @Redirect(method = "getAppearance(Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/util/math/Direction;)" +
@@ -30,7 +31,7 @@ public class AthenaWrappedGetterMixin {
             "getBlockState(Lnet/minecraft/util/math/BlockPos;)" +
             "Lnet/minecraft/block/BlockState;"))
     private BlockState appearanceCamoState(BlockRenderView world, BlockPos pos) {
-        if (world.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity) return framed_entity.getFirstTheme();
+        if (world.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity) return framed_entity.getTheme(1); // TODO theme
         return world.getBlockState(pos);
     }
 
@@ -39,7 +40,7 @@ public class AthenaWrappedGetterMixin {
             "getBlockState(Lnet/minecraft/util/math/BlockPos;)" +
             "Lnet/minecraft/block/BlockState;"))
     private BlockState queryCamoState(BlockRenderView world, BlockPos pos) {
-        if (world.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity) return framed_entity.getFirstTheme();
+        if (world.getBlockEntity(pos) instanceof ThemeableBlockEntity framed_entity) return framed_entity.getTheme(1); // TODO theme
         return world.getBlockState(pos);
     }
 }

src/main/java/fr/adrien1106/reframed/mixin/particles/MixinBlockDustParticle.java

@@ -1,5 +1,6 @@
 package fr.adrien1106.reframed.mixin.particles;
 
+import fr.adrien1106.reframed.block.ReFramedBlock;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.client.MinecraftClient;
@@ -20,8 +21,11 @@ public class MixinBlockDustParticle {
 	)
 	void modifyParticleSprite(ClientWorld clientWorld, double d, double e, double f, double g, double h, double i, BlockState state, BlockPos pos, CallbackInfo ci) {
 		AccessorParticle a = (AccessorParticle) this;
-		if(a.getRandom().nextBoolean() && clientWorld.getBlockEntity(pos) instanceof ThemeableBlockEntity themeable) {
-			BlockState theme = themeable.getFirstTheme();
+		if(a.getRandom().nextBoolean()
+			&& clientWorld.getBlockEntity(pos) instanceof ThemeableBlockEntity themeable
+			&& state.getBlock() instanceof ReFramedBlock block
+		) {
+			BlockState theme = themeable.getTheme(block.getTopThemeIndex(state));
 			if(theme == null || theme.isAir()) return;
 			
 			Sprite replacement = MinecraftClient.getInstance().getBlockRenderManager().getModels().getModelParticleSprite(theme);

src/main/java/fr/adrien1106/reframed/mixin/particles/MixinEntity.java

@@ -1,31 +1,31 @@
 package fr.adrien1106.reframed.mixin.particles;
 
+import com.llamalad7.mixinextras.sugar.Local;
+import fr.adrien1106.reframed.block.ReFramedBlock;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.Entity;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.ModifyArg;
 
 @Mixin(Entity.class)
 public abstract class MixinEntity {
-	@Shadow @Deprecated public abstract BlockPos getLandingPos(); //TODO, somewhat expensive method
-	
 	@ModifyArg(
 		method = "spawnSprintingParticles",
 		at = @At(value = "INVOKE", target = "Lnet/minecraft/particle/BlockStateParticleEffect;<init>(Lnet/minecraft/particle/ParticleType;Lnet/minecraft/block/BlockState;)V")
 	)
-	private BlockState modifyParticleState(BlockState origState) {
+	private BlockState modifyParticleState(BlockState state, @Local(ordinal = 0) BlockPos landing_pos) {
 		World world = ((Entity) (Object) this).getWorld();
 		
-		if(world.getBlockEntity(getLandingPos()) instanceof ThemeableBlockEntity themeable) {
-			BlockState theme = themeable.getFirstTheme();
-			if(!theme.isAir()) return theme;
+		if(world.getBlockEntity(landing_pos) instanceof ThemeableBlockEntity themeable
+			&& state.getBlock() instanceof ReFramedBlock block) {
+				BlockState theme = themeable.getTheme(block.getTopThemeIndex(state));
+				if(!theme.isAir()) return theme;
 		}
 		
-		return origState;
+		return state;
 	}
 }

src/main/java/fr/adrien1106/reframed/mixin/particles/MixinLivingEntity.java

@@ -1,5 +1,7 @@
 package fr.adrien1106.reframed.mixin.particles;
 
+import com.llamalad7.mixinextras.sugar.Local;
+import fr.adrien1106.reframed.block.ReFramedBlock;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.Entity;
@@ -7,33 +9,25 @@ import net.minecraft.entity.LivingEntity;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.ModifyArg;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 @Mixin(LivingEntity.class)
 public class MixinLivingEntity {
-	@Unique private BlockPos lastFallCheckPos;
-	
-	@Inject(method = "fall", at = @At("HEAD"))
-	private void onFall(double d, boolean bl, BlockState blockState, BlockPos blockPos, CallbackInfo ci) {
-		lastFallCheckPos = blockPos;
-	}
 	
 	@ModifyArg(
 		method = "fall",
 		at = @At(value = "INVOKE", target = "Lnet/minecraft/particle/BlockStateParticleEffect;<init>(Lnet/minecraft/particle/ParticleType;Lnet/minecraft/block/BlockState;)V")
 	)
-	private BlockState modifyParticleState(BlockState origState) {
+	private BlockState modifyParticleState(BlockState state, @Local(ordinal = 0, argsOnly = true) BlockPos land_pos) {
 		World world = ((Entity) (Object) this).getWorld();
 		
-		if(lastFallCheckPos != null && world.getBlockEntity(lastFallCheckPos) instanceof ThemeableBlockEntity themeable) {
-			BlockState theme = themeable.getFirstTheme();
-			if(!theme.isAir()) return theme;
+		if(world.getBlockEntity(land_pos) instanceof ThemeableBlockEntity themeable
+			&& state.getBlock() instanceof ReFramedBlock block) {
+				BlockState theme = themeable.getTheme(block.getTopThemeIndex(state));
+				if(!theme.isAir()) return theme;
 		}
 		
-		return origState;
+		return state;
 	}
 }

src/main/java/fr/adrien1106/reframed/mixin/render/BlockRenderInfoMixin.java

@@ -1,25 +1,29 @@
-package fr.adrien1106.reframed.mixin;
+package fr.adrien1106.reframed.mixin.render;
 
 import com.llamalad7.mixinextras.sugar.Local;
+import fr.adrien1106.reframed.block.ReFramedBlock;
+import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
 import fr.adrien1106.reframed.util.ThemeableBlockEntity;
 import net.fabricmc.fabric.impl.client.indigo.renderer.render.BlockRenderInfo;
-import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 import net.minecraft.world.BlockRenderView;
+import net.minecraft.world.BlockView;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.ModifyArg;
+import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 @Mixin(BlockRenderInfo.class)
-public abstract class BlockRenderInfoMixin {
+public abstract class BlockRenderInfoMixin implements IBlockRenderInfoMixin {
 
     @Shadow public BlockPos blockPos;
 
@@ -29,21 +33,38 @@ public abstract class BlockRenderInfoMixin {
 
     @Shadow @Final private BlockPos.Mutable searchPos;
 
+    @Shadow public abstract void prepareForBlock(BlockState blockState, BlockPos blockPos, boolean modelAo);
+
+    @Unique
+    private int theme_index = 1;
+
     @ModifyArg(method = "prepareForBlock",
         at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/RenderLayers;" +
             "getBlockLayer(Lnet/minecraft/block/BlockState;)Lnet/minecraft/client/render/RenderLayer;"))
     public BlockState prepareCamoLayer(BlockState state, @Local(argsOnly = true) BlockPos pos) {
         BlockEntity block_entity = MinecraftClient.getInstance().world.getBlockEntity(pos);
         if (!(block_entity instanceof ThemeableBlockEntity frame_entity)) return state;
-        return frame_entity.getFirstTheme();
+        return frame_entity.getTheme(theme_index);
     }
 
     @Inject(method = "shouldDrawFace",
         at = @At(value = "INVOKE_ASSIGN", target = "Lnet/minecraft/util/math/Direction;getId()I"),
         cancellable = true)
     private void shouldDrawCamoFace(Direction face, CallbackInfoReturnable<Boolean> cir) {
+        // early injection for camos themselves
         BlockEntity block_entity = MinecraftClient.getInstance().world.getBlockEntity(blockPos);
         if (!(block_entity instanceof ThemeableBlockEntity)) return;
-        cir.setReturnValue(Block.shouldDrawSide(blockState, blockView, blockPos, face, searchPos.set(blockPos, face)));
+        cir.setReturnValue(ReFramedBlock.shouldDrawSide(blockState, blockView, blockPos, face, searchPos.set(blockPos, face), theme_index));
+    }
+
+    @Redirect(method = "shouldDrawFace", at = @At(value = "INVOKE", target = "Lnet/minecraft/block/Block;shouldDrawSide(Lnet/minecraft/block/BlockState;Lnet/minecraft/world/BlockView;Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/util/math/Direction;Lnet/minecraft/util/math/BlockPos;)Z"))
+    private boolean shouldDrawAdjacentCamoSide(BlockState state, BlockView world, BlockPos pos, Direction side, BlockPos other_pos) {
+        return ReFramedBlock.shouldDrawSide(state, world, pos, side, other_pos, theme_index);
+    }
+
+    @Override
+    public void prepareForBlock(BlockState state, BlockPos pos, boolean ao, int theme_index) {
+        this.theme_index = theme_index;
+        prepareForBlock(state, pos, ao);
     }
 }

src/main/java/fr/adrien1106/reframed/mixin/render/MultipartBakedModelMixin.java

@@ -0,0 +1,25 @@
+package fr.adrien1106.reframed.mixin.render;
+
+import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.MultipartBakedModel;
+import org.apache.commons.lang3.tuple.Pair;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.function.Predicate;
+
+@Mixin(MultipartBakedModel.class)
+public class MultipartBakedModelMixin implements IMultipartBakedModelMixin {
+
+    @Shadow @Final private List<Pair<Predicate<BlockState>, BakedModel>> components;
+
+    @Override
+    public BakedModel getModel(BlockState state) {
+        return components.stream().map(pair -> pair.getLeft().test(state) ? pair.getRight(): null).filter(Objects::nonNull).findAny().orElse(null);
+    }
+}

src/main/java/fr/adrien1106/reframed/mixin/render/TerrainRenderContextMixin.java

@@ -0,0 +1,41 @@
+package fr.adrien1106.reframed.mixin.render;
+
+import fr.adrien1106.reframed.client.model.MultiRetexturableModel;
+import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.AbstractBlockRenderContext;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.TerrainRenderContext;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.util.math.BlockPos;
+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;
+
+import java.util.List;
+
+@Mixin(TerrainRenderContext.class)
+public abstract class TerrainRenderContextMixin extends AbstractBlockRenderContext {
+
+    @Inject(method = "tessellateBlock", at = @At(
+            value = "INVOKE",
+            target = "Lnet/fabricmc/fabric/impl/client/indigo/renderer/aocalc/AoCalculator;clear()V",
+            shift = At.Shift.AFTER
+        ), cancellable = true)
+    private void renderMultipleModels(BlockState state, BlockPos pos, BakedModel wrapper, MatrixStack matrixStack, CallbackInfo ci) {
+        if (!(wrapper instanceof IMultipartBakedModelMixin wrapped)
+            || !(wrapped.getModel(state) instanceof MultiRetexturableModel retexturing_model)) return;
+
+        List<BakedModel> models = retexturing_model.models();
+        int i = 0;
+        for (BakedModel bakedModel : models) {
+            i++;
+            aoCalc.clear();
+            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(state, pos, bakedModel.useAmbientOcclusion(), i);
+            bakedModel.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
+        }
+        ci.cancel();
+    }
+}

src/main/java/fr/adrien1106/reframed/mixin/render/WorldRendererMixin.java

@@ -0,0 +1,35 @@
+package fr.adrien1106.reframed.mixin.render;
+
+import fr.adrien1106.reframed.block.ReFramedDoubleBlock;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.ShapeContext;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.world.BlockView;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(WorldRenderer.class)
+public class WorldRendererMixin {
+
+    @Shadow @Final private MinecraftClient client;
+
+    @Redirect(method = "drawBlockOutline",
+        at = @At(value = "INVOKE", target = "Lnet/minecraft/block/BlockState;" +
+            "getOutlineShape(" +
+                "Lnet/minecraft/world/BlockView;" +
+                "Lnet/minecraft/util/math/BlockPos;" +
+                "Lnet/minecraft/block/ShapeContext;" +
+            ")Lnet/minecraft/util/shape/VoxelShape;"))
+    private VoxelShape getRenderOutline(BlockState state, BlockView world, BlockPos pos, ShapeContext shape_context) {
+        if (state.getBlock() instanceof ReFramedDoubleBlock double_frame_block) // cast is already checked in render
+            return double_frame_block.getRenderOutline(state, (BlockHitResult) client.crosshairTarget);
+        return state.getOutlineShape(world, pos, shape_context);
+    }
+}

src/main/java/fr/adrien1106/reframed/util/IBlockRenderInfoMixin.java

@@ -0,0 +1,9 @@
+package fr.adrien1106.reframed.util;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.util.math.BlockPos;
+
+public interface IBlockRenderInfoMixin {
+
+    void prepareForBlock(BlockState state, BlockPos pos, boolean ao, int theme_index);
+}

src/main/java/fr/adrien1106/reframed/util/IMultipartBakedModelMixin.java

@@ -0,0 +1,9 @@
+package fr.adrien1106.reframed.util;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
+
+public interface IMultipartBakedModelMixin {
+
+    BakedModel getModel(BlockState state);
+}

src/main/java/fr/adrien1106/reframed/util/ReFramedInteractionUtil.java

@@ -28,8 +28,10 @@ import org.jetbrains.annotations.Nullable;
 //For an example of how to use this class, have a look at TemplateBlock.
 //Basically there are several methods that would like to modify the return value of something.
 public class ReFramedInteractionUtil {
+	@Deprecated // TODO remove
 	public static final BooleanProperty LIGHT = BooleanProperty.of("frame_light");
-	
+
+	@Deprecated // TODO remove
 	public static StateManager.Builder<Block, BlockState> appendProperties(StateManager.Builder<Block, BlockState> builder) {
 		return builder.add(LIGHT);
 	}
@@ -37,24 +39,31 @@ public class ReFramedInteractionUtil {
 	//Use this to obtain a Block.Settings that'll make your Template act like the ones in the mod.
 	//(To complete the look, don't forget to tag your blocks with mineable/axe.)
 	private static final AbstractBlock.ContextPredicate NOPE = (blah, blahdey, blahh) -> false;
+
+	// TODO Find better place
 	public static AbstractBlock.Settings configureSettings(AbstractBlock.Settings s) {
 		return s.luminance(ReFramedInteractionUtil::luminance).nonOpaque().sounds(BlockSoundGroup.WOOD).hardness(0.2f).suffocates(NOPE).blockVision(NOPE);
 	}
-	
+
+
+	// TODO Find better place
 	//And if you don't have a Block.Settings to copy off of.
 	public static AbstractBlock.Settings makeSettings() {
 		return configureSettings(AbstractBlock.Settings.create());
 	}
-	
+
+	@Deprecated // TODO remove
 	public static BlockState setDefaultStates(BlockState in) {
 		if(in.contains(LIGHT)) in = in.with(LIGHT, false);
 		return in;
 	}
-	
+
+	@Deprecated // TODO remove
 	public static @Nullable BlockState modifyPlacementState(@Nullable BlockState in, ItemPlacementContext ctx) {
-		return ReFramedEntity.weirdNbtLightLevelStuff(in, ctx.getStack());
+		return ReFramedEntity.getNbtLightLevel(in, ctx.getStack());
 	}
-	
+
+	@Deprecated // TODO remove
 	public static ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
 		if(!(world.getBlockEntity(pos) instanceof ReFramedEntity block_entity)) return ActionResult.PASS;
 		if(!player.canModifyBlocks() || !world.canPlayerModifyAt(player, pos)) return ActionResult.PASS;
@@ -96,14 +105,14 @@ public class ReFramedInteractionUtil {
 			return ActionResult.SUCCESS;
 		}
 		
-		// Changing the theme TODO Move outside
-		if(held.getItem() instanceof BlockItem block_item && block_entity.getFirstTheme().getBlock() == Blocks.AIR) {
+		// Changing the theme
+		if(held.getItem() instanceof BlockItem block_item && block_entity.getTheme(1).getBlock() == Blocks.AIR) {
 			Block block = block_item.getBlock();
 			ItemPlacementContext ctx = new ItemPlacementContext(new ItemUsageContext(player, hand, hit));
 			BlockState placementState = block.getPlacementState(ctx);
 			if(placementState != null && Block.isShapeFullCube(placementState.getCollisionShape(world, pos)) && !(block instanceof BlockEntityProvider)) {
 				// TODO FOR SECOND
-				if(!world.isClient) block_entity.setFirstTheme(placementState);
+				if(!world.isClient) block_entity.setTheme(placementState, 1);
 
 				// check for default light emission
 				if (placementState.getLuminance() > 0)
@@ -126,6 +135,7 @@ public class ReFramedInteractionUtil {
 		return ActionResult.PASS;
 	}
 
+	@Deprecated
 	public static void onStateReplaced(BlockState state, World world, BlockPos pos, BlockState newState, boolean moved) {
 		if(!state.isOf(newState.getBlock()) &&
 			world.getBlockEntity(pos) instanceof ReFramedEntity frame_entity &&
@@ -133,7 +143,7 @@ public class ReFramedInteractionUtil {
 		) {
 			DefaultedList<ItemStack> drops = DefaultedList.of();
 
-			BlockState theme = frame_entity.getFirstTheme();
+			BlockState theme = frame_entity.getTheme(1);
 			if(theme.getBlock() != Blocks.AIR) drops.add(new ItemStack(theme.getBlock()));
 			
 			if(frame_entity.emitsRedstone() && theme.getWeakRedstonePower(world, pos, Direction.NORTH) == 0)
@@ -146,7 +156,8 @@ public class ReFramedInteractionUtil {
 			ItemScatterer.spawn(world, pos, drops);
 		}
 	}
-	
+
+	@Deprecated
 	public static void onPlaced(World world, BlockPos pos, BlockState state, @Nullable LivingEntity placer, ItemStack stack) {
 		//Load the BlockEntityTag clientside, which fixes the template briefly showing its default state when placing it.
 		//I'm surprised this doesn't happen by default; the BlockEntityTag stuff is only done serverside.
@@ -155,21 +166,25 @@ public class ReFramedInteractionUtil {
 			if(tag != null) be.readNbt(tag);
 		}
 	}
-	
+
+	@Deprecated
 	//Returns "null" to signal "no opinion". Imagine it like an InteractionResult.PASS.
 	public static @Nullable VoxelShape getCollisionShape(BlockState state, BlockView view, BlockPos pos, ShapeContext ctx) {
 		return view.getBlockEntity(pos) instanceof ReFramedEntity be && !be.isSolid() ? VoxelShapes.empty() : null;
 	}
-	
+
+	@Deprecated // TODO remove
 	public static boolean emitsRedstonePower(BlockState state) {
 		//return state.contains(REDSTONE) ? state.get(REDSTONE) : false;
 		return false; //TODO, not available after punting this to BlockEntity. Yarn makes this method sound more important than it is, it's just for dust redirection.
 	}
-	
+
+	@Deprecated // TODO remove
 	public static int getWeakRedstonePower(BlockState state, BlockView view, BlockPos pos, Direction dir) {
 		return view.getBlockEntity(pos) instanceof ReFramedEntity be && be.emitsRedstone() ? 15 : 0;
 	}
-	
+
+	@Deprecated // TODO remove
 	public static int getStrongRedstonePower(BlockState state, BlockView view, BlockPos pos, Direction dir) {
 		return view.getBlockEntity(pos) instanceof ReFramedEntity be && be.emitsRedstone() ? 15 : 0;
 	}

src/main/java/fr/adrien1106/reframed/util/ThemeableBlockEntity.java

@@ -2,16 +2,12 @@ package fr.adrien1106.reframed.util;
 
 import net.minecraft.block.BlockState;
 
+import java.util.List;
+
 public interface ThemeableBlockEntity {
-	BlockState getFirstTheme();
+	BlockState getTheme(int i);
 
-	default BlockState getSecondTheme() {
-		return getFirstTheme();
-	}
+	void setTheme(BlockState state, int i);
 
-	void setFirstTheme(BlockState state);
-
-	default void setSecondTheme(BlockState state) {
-		setFirstTheme(state);
-	}
+	List<BlockState> getThemes();
 }

src/main/resources/assets/reframed/blockstates/slab.json

@@ -1,65 +0,0 @@
-{
-	"multipart": [
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true
-			},
-			"when": {
-				"facing": "down"
-			}
-		},
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true,
-				"x": 180
-			},
-			"when": {
-				"facing": "up"
-			}
-		},
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true,
-				"x": 270
-			},
-			"when": {
-				"facing": "north"
-			}
-		},
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true,
-				"x": 90
-			},
-			"when": {
-				"facing": "south"
-			}
-		},
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true,
-				"x": 90,
-				"y": 90
-			},
-			"when": {
-				"facing": "west"
-			}
-		},
-		{
-			"apply": {
-				"model": "reframed:slab_special",
-				"uvlock": true,
-				"x": 90,
-				"y": 270
-			},
-			"when": {
-				"facing": "east"
-			}
-		}
-	]
-}

src/main/resources/reframed.mixins.json

@@ -9,16 +9,18 @@
     "particles.MixinLivingEntity"
   ],
   "client": [
-    "BlockMixin",
-    "BlockRenderInfoMixin",
     "MinecraftAccessor",
     "compat.AthenaBakedModelMixin",
-    "compat.AthenaWrappedGetterMixin",
     "compat.AthenaConnectedBlockModelMixin",
+    "compat.AthenaWrappedGetterMixin",
     "model.WeightedBakedModelAccessor",
     "particles.AccessorParticle",
     "particles.AccessorSpriteBillboardParticle",
-    "particles.MixinBlockDustParticle"
+    "particles.MixinBlockDustParticle",
+    "render.BlockRenderInfoMixin",
+    "render.MultipartBakedModelMixin",
+    "render.TerrainRenderContextMixin",
+    "render.WorldRendererMixin"
   ],
   "injectors": {
     "defaultRequire": 1