fix error + cleanup

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

@@ -1,7 +1,7 @@
 package fr.adrien1106.reframed;
 
 import fr.adrien1106.reframed.block.*;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
 import net.fabricmc.api.ModInitializer;
 import net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroup;
 import net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder;
@@ -26,7 +26,9 @@ import java.util.function.BiConsumer;
 import java.util.stream.Collectors;
 
 /**
- * TODO self culling, fix other models, better connected textures, preload items, better cache
+ * TODO self culling
+ * TODO fix other models
+ * TODO better connected textures
  */
 public class ReFramed implements ModInitializer {
 	public static final String MODID = "reframed";

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

@@ -2,7 +2,7 @@ package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
 import fr.adrien1106.reframed.generator.RecipeSetter;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider;
 import net.minecraft.block.*;
 import net.minecraft.block.entity.BlockEntity;
@@ -33,7 +33,7 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
-import static fr.adrien1106.reframed.util.BlockProperties.LIGHT;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.LIGHT;
 
 public class ReFramedBlock extends Block implements BlockEntityProvider, RecipeSetter {
 
@@ -42,6 +42,23 @@ public class ReFramedBlock extends Block implements BlockEntityProvider, RecipeS
 		setDefaultState(getDefaultState().with(LIGHT, false));
 	}
 
+	/**
+	 * Generates a record for the key so that it replaces the blockstate
+	 * which may have states that returns same models
+	 * @param state - the state_key to generate the key from
+	 * @return a cache key with only relevant properties
+	 */
+	public Object getModelCacheKey(BlockState state) {
+		return "";
+	}
+
+	/**
+	 * @return the amount of models the block can have prevents allocating too much space for a model
+	 */
+	public int getModelStateCount() {
+		return 1;
+	}
+	
 	//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
 	//Just make your own BlockEntityType, it's fine, you can even use the same ReFramedEntity class
 	@Override
@@ -98,7 +115,7 @@ public class ReFramedBlock extends Block implements BlockEntityProvider, RecipeS
 				&& themes.stream().noneMatch(theme -> theme.getLuminance() != 0))
 					drops.add(new ItemStack(Items.GLOWSTONE_DUST));
 			if(!frame_entity.isSolid()
-				&& themes.stream().anyMatch(theme -> theme.isSolid()))
+				&& themes.stream().anyMatch(AbstractBlockState::isSolid))
 				drops.add(new ItemStack(Items.POPPED_CHORUS_FRUIT));
 
 			ItemScatterer.spawn(world, pos, drops);

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

@@ -1,8 +1,8 @@
 package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.ShapeContext;
 import net.minecraft.block.entity.BlockEntity;

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

@@ -44,7 +44,7 @@ public class ReFramedDoubleEntity extends ReFramedEntity {
     public void readNbt(NbtCompound nbt) {
         super.readNbt(nbt);
 
-        BlockState rendered_state = second_state;// keep previous state to check if rerender is needed
+        BlockState rendered_state = second_state;// keep previous state_key to check if rerender is needed
         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

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

@@ -13,7 +13,6 @@ import net.minecraft.data.server.recipe.ShapelessRecipeJsonBuilder;
 import net.minecraft.item.ItemPlacementContext;
 import net.minecraft.recipe.book.RecipeCategory;
 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;
@@ -25,25 +24,36 @@ import static net.minecraft.data.client.VariantSettings.Rotation.R90;
 import static net.minecraft.state.property.Properties.AXIS;
 
 public class ReFramedDoubleSlabBlock extends ReFramedDoubleBlock implements BlockStateProvider {
+
     public ReFramedDoubleSlabBlock(Settings settings) {
         super(settings);
-        setDefaultState(getDefaultState().with(Properties.AXIS, Direction.Axis.Y));
+        setDefaultState(getDefaultState().with(AXIS, Direction.Axis.Y));
+    }
+
+    @Override
+    public Object getModelCacheKey(BlockState state) {
+        return state.get(AXIS);
+    }
+
+    @Override
+    public int getModelStateCount() {
+        return 3;
     }
 
     @Override
     protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
-        super.appendProperties(builder.add(Properties.AXIS));
+        super.appendProperties(builder.add(AXIS));
     }
 
     @Nullable
     @Override
     public BlockState getPlacementState(ItemPlacementContext ctx) {
-        return super.getPlacementState(ctx).with(Properties.AXIS, ctx.getSide().getAxis());
+        return super.getPlacementState(ctx).with(AXIS, ctx.getSide().getAxis());
     }
 
     @Override
     public VoxelShape getShape(BlockState state, int i) {
-        return switch (state.get(Properties.AXIS)) {
+        return switch (state.get(AXIS)) {
             case Y -> i == 2 ? UP    : DOWN;
             case Z -> i == 2 ? NORTH : SOUTH;
             case X -> i == 2 ? EAST  : WEST;

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

@@ -2,9 +2,9 @@ package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
 import fr.adrien1106.reframed.generator.BlockStateProvider;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.property.Corner;
+import fr.adrien1106.reframed.util.blocks.Corner;
-import fr.adrien1106.reframed.util.property.StairShape;
+import fr.adrien1106.reframed.util.blocks.StairShape;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -28,17 +28,27 @@ import java.util.ArrayList;
 import java.util.List;
 
 import static fr.adrien1106.reframed.block.ReFramedStairsBlock.*;
-import static fr.adrien1106.reframed.util.BlockProperties.CORNER;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.CORNER;
-import static fr.adrien1106.reframed.util.BlockProperties.STAIR_SHAPE;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.STAIR_SHAPE;
-import static fr.adrien1106.reframed.util.property.StairShape.STRAIGHT;
 
 public class ReFramedDoubleStairsBlock extends ReFramedDoubleBlock implements BlockStateProvider {
 
     private static final List<VoxelShape> COMPLEMENT_LIST = new ArrayList<>(52);
+    private record ModelCacheKey(Corner corner, StairShape shape) {}
 
     public ReFramedDoubleStairsBlock(Settings settings) {
         super(settings);
-        setDefaultState(getDefaultState().with(CORNER, Corner.NORTH_DOWN).with(STAIR_SHAPE, STRAIGHT));
+        setDefaultState(getDefaultState().with(CORNER, Corner.NORTH_DOWN).with(STAIR_SHAPE, StairShape.STRAIGHT));
+    }
+
+    @Override
+    public Object getModelCacheKey(BlockState state) {
+        return new ModelCacheKey(state.get(CORNER), state.get(STAIR_SHAPE));
+    }
+
+    @Override
+    public int getModelStateCount() {
+        return 108; // Has 12 * 9 state combination and 52 models still reduces cache size
     }
 
     @Override

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

@@ -1,9 +1,9 @@
 package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
-import fr.adrien1106.reframed.generator.GBlockstate;
 import fr.adrien1106.reframed.generator.BlockStateProvider;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.generator.GBlockstate;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -24,19 +24,31 @@ import net.minecraft.util.shape.VoxelShape;
 import net.minecraft.world.BlockView;
 import org.jetbrains.annotations.Nullable;
 
-import static fr.adrien1106.reframed.block.ReFramedSlabBlock.*;
+import static fr.adrien1106.reframed.block.ReFramedSlabBlock.getSlabShape;
 import static fr.adrien1106.reframed.block.ReFramedStepBlock.STEP_VOXELS;
 import static net.minecraft.data.client.VariantSettings.Rotation.*;
-import static net.minecraft.state.property.Properties.FACING;
 import static net.minecraft.state.property.Properties.AXIS;
+import static net.minecraft.state.property.Properties.FACING;
 import static net.minecraft.util.shape.VoxelShapes.empty;
 
 public class ReFramedDoubleStepBlock extends WaterloggableReFramedDoubleBlock implements BlockStateProvider {
+    private record ModelCacheKey(Direction facing, Axis axis) {}
+
     public ReFramedDoubleStepBlock(Settings settings) {
         super(settings);
         setDefaultState(getDefaultState().with(FACING, Direction.DOWN).with(AXIS, Axis.X));
     }
 
+    @Override
+    public Object getModelCacheKey(BlockState state) {
+        return new ModelCacheKey(state.get(FACING), state.get(AXIS));
+    }
+
+    @Override
+    public int getModelStateCount() {
+        return 18;
+    }
+
     @Override
     protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
         super.appendProperties(builder.add(FACING, AXIS));

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

@@ -1,8 +1,8 @@
 package fr.adrien1106.reframed.block;
 
 import fr.adrien1106.reframed.ReFramed;
-import fr.adrien1106.reframed.util.BlockProperties;
+import fr.adrien1106.reframed.util.blocks.BlockProperties;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.block.entity.BlockEntity;
@@ -27,7 +27,7 @@ import java.util.Objects;
 
 //Keeping the weight of this block entity down, both in terms of memory consumption and NBT sync traffic,
 //is pretty important since players might place a lot of them. There were tons and tons of these at Blanketcon.
-//To that end, most of the state has been crammed into a bitfield.
+//To that end, most of the state_key has been crammed into a bitfield.
 public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity {
 	protected BlockState first_state = Blocks.AIR.getDefaultState();
 	protected byte bit_field = SOLIDITY_MASK;
@@ -47,7 +47,7 @@ public class ReFramedEntity extends BlockEntity implements ThemeableBlockEntity
 	public void readNbt(NbtCompound nbt) {
 		super.readNbt(nbt);
 		
-		BlockState rendered_state = first_state; // keep previous state to check if rerender is needed
+		BlockState rendered_state = first_state; // keep previous state_key to check if rerender is needed
 		first_state = NbtHelper.toBlockState(Registries.BLOCK.getReadOnlyWrapper(), nbt.getCompound(BLOCKSTATE_KEY + 1));
 		if (nbt.contains(BITFIELD_KEY)) bit_field = nbt.getByte(BITFIELD_KEY);
 		

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

@@ -39,6 +39,16 @@ public class ReFramedSlabBlock extends WaterloggableReFramedBlock implements Blo
 		setDefaultState(getDefaultState().with(FACING, Direction.DOWN));
 	}
 
+	@Override
+	public Object getModelCacheKey(BlockState state) {
+		return state.get(FACING);
+	}
+
+	@Override
+	public int getModelStateCount() {
+		return 6;
+	}
+	
 	@Override
 	protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
 		super.appendProperties(builder.add(FACING));

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

@@ -3,10 +3,10 @@ package fr.adrien1106.reframed.block;
 import fr.adrien1106.reframed.ReFramed;
 import fr.adrien1106.reframed.generator.GBlockstate;
 import fr.adrien1106.reframed.generator.BlockStateProvider;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
 import fr.adrien1106.reframed.util.VoxelHelper;
-import fr.adrien1106.reframed.util.property.Corner;
+import fr.adrien1106.reframed.util.blocks.Corner;
-import fr.adrien1106.reframed.util.property.StairShape;
+import fr.adrien1106.reframed.util.blocks.StairShape;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -34,20 +34,31 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Stream;
 
-import static fr.adrien1106.reframed.util.BlockProperties.*;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.*;
-import static fr.adrien1106.reframed.util.property.StairShape.*;
+import static fr.adrien1106.reframed.util.blocks.StairShape.*;
 import static net.minecraft.data.client.VariantSettings.Rotation.*;
-import static fr.adrien1106.reframed.util.property.Corner.*;
+import static fr.adrien1106.reframed.util.blocks.Corner.*;
 
 public class ReFramedStairsBlock extends WaterloggableReFramedBlock implements BlockStateProvider {
 	
 	public static final List<VoxelShape> VOXEL_LIST = new ArrayList<>(52);
+	private record ModelCacheKey(Corner corner, StairShape shape) {}
 
 	public ReFramedStairsBlock(Settings settings) {
 		super(settings);
 		setDefaultState(getDefaultState().with(CORNER, Corner.NORTH_DOWN).with(STAIR_SHAPE, STRAIGHT));
 	}
 
+	@Override
+	public Object getModelCacheKey(BlockState state) {
+		return new ModelCacheKey(state.get(CORNER), state.get(STAIR_SHAPE));
+	}
+
+	@Override
+	public int getModelStateCount() {
+		return 108; // Has 12 * 9 state combination and 52 models still reduces cache size
+	}
+	
 	@Override
 	protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
 		super.appendProperties(builder.add(CORNER, STAIR_SHAPE));

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

@@ -3,9 +3,9 @@ package fr.adrien1106.reframed.block;
 import fr.adrien1106.reframed.ReFramed;
 import fr.adrien1106.reframed.generator.GBlockstate;
 import fr.adrien1106.reframed.generator.BlockStateProvider;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
 import fr.adrien1106.reframed.util.VoxelHelper;
-import fr.adrien1106.reframed.util.property.Corner;
+import fr.adrien1106.reframed.util.blocks.Corner;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -28,8 +28,8 @@ import org.jetbrains.annotations.Nullable;
 import java.util.ArrayList;
 import java.util.List;
 
-import static fr.adrien1106.reframed.util.BlockProperties.CORNER;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.CORNER;
-import static fr.adrien1106.reframed.util.property.Corner.*;
+import static fr.adrien1106.reframed.util.blocks.Corner.*;
 import static net.minecraft.data.client.VariantSettings.Rotation.*;
 
 public class ReFramedStepBlock extends WaterloggableReFramedBlock implements BlockStateProvider {
@@ -41,6 +41,16 @@ public class ReFramedStepBlock extends WaterloggableReFramedBlock implements Blo
         setDefaultState(getDefaultState().with(CORNER, Corner.NORTH_DOWN));
     }
 
+    @Override
+    public Object getModelCacheKey(BlockState state) {
+        return state.get(CORNER);
+    }
+
+    @Override
+    public int getModelStateCount() {
+        return 12;
+    }
+
     @Override
     protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
         super.appendProperties(builder.add(CORNER));

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

@@ -5,7 +5,6 @@ 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;
@@ -45,7 +44,7 @@ public class DoubleRetexturingBakedModel extends ForwardingBakedModel implements
     }
 
     @Override
-    public List<BakedModel> models() {
+    public List<ForwardingBakedModel> models() {
         return List.of(model_1, model_2);
     }
 }

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

@@ -1,10 +1,10 @@
 package fr.adrien1106.reframed.client.model;
 
-import net.minecraft.client.render.model.BakedModel;
+import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
 
 import java.util.List;
 
 public interface MultiRetexturableModel {
 
-    List<BakedModel> models();
+    List<ForwardingBakedModel> models();
 }

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

@@ -76,4 +76,15 @@ public record QuadPosBounds(float min_x, float max_x, float min_y, float max_y,
             quad.pos(i, pos);
         }
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof QuadPosBounds other)) return false;
+        return MathHelper.approximatelyEquals(min_x, other.min_x)
+            && MathHelper.approximatelyEquals(min_y, other.min_y)
+            && MathHelper.approximatelyEquals(min_z, other.min_z)
+            && MathHelper.approximatelyEquals(max_x, other.max_x)
+            && MathHelper.approximatelyEquals(max_y, other.max_y)
+            && MathHelper.approximatelyEquals(max_z, other.max_z);
+    }
 }

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

@@ -1,17 +1,15 @@
 package fr.adrien1106.reframed.client.model;
 
+import fr.adrien1106.reframed.block.ReFramedBlock;
 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;
 import fr.adrien1106.reframed.client.model.apperance.CamoAppearanceManager;
 import fr.adrien1106.reframed.client.model.apperance.WeightedComputedAppearance;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
-import net.fabricmc.fabric.api.renderer.v1.mesh.Mesh;
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap;
-import net.fabricmc.fabric.api.renderer.v1.mesh.MeshBuilder;
+import net.fabricmc.fabric.api.renderer.v1.mesh.*;
-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;
 import net.fabricmc.fabric.api.renderer.v1.render.RenderContext;
 import net.minecraft.block.BlockState;
@@ -26,34 +24,43 @@ import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.random.Random;
 import net.minecraft.world.BlockRenderView;
 
-import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 import java.util.function.Supplier;
 
 public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 	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.appearance_manager = tam;
 		this.theme_index = theme_index;
 		this.uv_lock = settings.isUvLocked();
 		this.item_state = item_state;
 		this.ao = ao;
+
+		int cache_size = 64; // default is 64 why don't ask me and it should get overwritten
+		if (item_state.getBlock() instanceof ReFramedBlock frame_block) cache_size = frame_block.getModelStateCount() + 1;
+		BASE_MESH_CACHE = new Object2ObjectLinkedOpenHashMap<>(cache_size, 0.25f) {
+			@Override
+			protected void rehash(int v) {}
+		};
 	}
 
-	protected final CamoAppearanceManager tam;
+	protected final CamoAppearanceManager appearance_manager;
 	protected final int theme_index;
 	protected final boolean uv_lock;
-	protected final BlockState item_state;
 	protected final boolean ao;
+	protected final BlockState item_state;
 
-	/* ----------------------------------------------- CACHE ELEMENT ------------------------------------------------ */
+	protected record MeshCacheKey(Object state_key, CamoAppearance appearance, int model_id) {}
-	// TODO make static ? for connected textures ?
+	/** cache that store retextured models */
-	protected record MeshCacheKey(BlockState state, TransformCacheKey transform) {}
+	protected final Object2ObjectLinkedOpenHashMap<MeshCacheKey, Mesh> RETEXTURED_MESH_CACHE =
-	protected record TransformCacheKey(CamoAppearance appearance, int model_id) {}
+		new Object2ObjectLinkedOpenHashMap<>(128, 0.25f) {
-	protected final ConcurrentMap<TransformCacheKey, RetexturingTransformer> retextured_transforms = new ConcurrentHashMap<>();
+			@Override
-	protected final ConcurrentMap<MeshCacheKey, Mesh> retextured_meshes = new ConcurrentHashMap<>(); //mutable, append-only cache
+			protected void rehash(int v) {}
+		};
+
+	/** cache that stores the base meshes which has the size of the amount of models */
+	protected final Object2ObjectLinkedOpenHashMap<Object, Mesh> BASE_MESH_CACHE;
 
 	protected static final Direction[] DIRECTIONS_AND_NULL;
 	static {
@@ -62,11 +69,12 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 		System.arraycopy(values, 0, DIRECTIONS_AND_NULL, 0, values.length);
 	}
 
-	protected final ConcurrentMap<BlockState, Mesh> jsonToMesh = new ConcurrentHashMap<>();
+	protected Mesh getBaseMesh(Object key, BlockState state) {
-
-	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);
+		if (BASE_MESH_CACHE.containsKey(key)) return BASE_MESH_CACHE.getAndMoveToFirst(key);
+		Mesh mesh = convertModel(state);
+		BASE_MESH_CACHE.putAndMoveToFirst(key, mesh);
+		return mesh;
 	}
 
 	protected abstract Mesh convertModel(BlockState state);
@@ -78,39 +86,42 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 	
 	@Override
 	public Sprite getParticleSprite() {
-		return tam.getDefaultAppearance(theme_index).getSprites(Direction.UP, 0).get(0).sprite();
+		return appearance_manager.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) {
+		// skip render if block not a frame (which should always be the case
+		if (!(state.getBlock() instanceof ReFramedBlock frame_block)) return;
 		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(theme_index), 0)), 0).outputTo(quad_emitter);
+			getRetexturedMesh(
+				new MeshCacheKey(
+					frame_block.getModelCacheKey(state),
+					appearance_manager.getDefaultAppearance(theme_index),
+					0
+				),
+				state
+			).outputTo(quad_emitter);
 			return;
 		}
 		if(theme.getBlock() == Blocks.BARRIER) return;
 		
-		CamoAppearance camo = tam.getCamoAppearance(world, theme, pos, theme_index);
+		CamoAppearance camo = appearance_manager.getCamoAppearance(world, theme, pos, theme_index);
 		long seed = theme.getRenderingSeed(pos);
 		int model_id = 0;
 		if (camo instanceof WeightedComputedAppearance wca) model_id = wca.getAppearanceIndex(seed);
 
 		int tint = 0xFF000000 | MinecraftClient.getInstance().getBlockColors().getColor(theme, world, pos, 0);
-		Mesh untintedMesh = getUntintedRetexturedMesh(
+		Mesh untintedMesh = getRetexturedMesh(new MeshCacheKey(frame_block.getModelCacheKey(state), camo, model_id), state);
-			new MeshCacheKey(
-				state,
-				new TransformCacheKey(camo, model_id)
-			),
-			seed
-		);
 		
 		//The specific tint might vary a lot; imagine grass color smoothly changing. Trying to bake the tint into
 		//the cached mesh will pollute it with a ton of single-use meshes with only slightly different colors.
 		if(tint == 0xFFFFFFFF) {
 			untintedMesh.outputTo(quad_emitter);
 		} else {
-			context.pushTransform(new TintingTransformer(camo, tint, seed));
+			context.pushTransform(new TintingTransformer(camo, model_id, tint));
 			untintedMesh.outputTo(quad_emitter);
 			context.popTransform();
 		}
@@ -120,120 +131,71 @@ public abstract class RetexturingBakedModel extends ForwardingBakedModel {
 	public void emitItemQuads(ItemStack stack, Supplier<Random> randomSupplier, RenderContext context) {
 		//cheeky: if the item has NBT data, pluck out the blockstate from it & look up the item color provider
 		//none of this is accessible unless you're in creative mode doing ctrl-pick btw
-		CamoAppearance nbtAppearance;
+		CamoAppearance appearance;
 		int tint;
 		BlockState theme = ReFramedEntity.readStateFromItem(stack, theme_index);
 		if(!theme.isAir()) {
-			nbtAppearance = tam.getCamoAppearance(null, theme, null, theme_index);
+			appearance = appearance_manager.getCamoAppearance(null, theme, null, theme_index);
 			tint = 0xFF000000 | ((MinecraftAccessor) MinecraftClient.getInstance()).getItemColors().getColor(new ItemStack(theme.getBlock()), 0);
 		} else {
-			nbtAppearance = tam.getDefaultAppearance(theme_index);
+			appearance = appearance_manager.getDefaultAppearance(theme_index);
 			tint = 0xFFFFFFFF;
 		}
 		
-		Mesh untintedMesh = getUntintedRetexturedMesh(new MeshCacheKey(item_state, new TransformCacheKey(nbtAppearance, 0)), 0);
+		Mesh untintedMesh = getRetexturedMesh(new MeshCacheKey("I", appearance, 0), item_state);
 
 		QuadEmitter quad_emitter = context.getEmitter();
 		if(tint == 0xFFFFFFFF) {
 			untintedMesh.outputTo(quad_emitter);
 		} else {
-			context.pushTransform(new TintingTransformer(nbtAppearance, tint, 0));
+			context.pushTransform(new TintingTransformer(appearance, 0, tint));
 			untintedMesh.outputTo(quad_emitter);
 			context.popTransform();
 		}
 	}
 	
-	protected Mesh getUntintedRetexturedMesh(MeshCacheKey key, long seed) {
+	protected Mesh getRetexturedMesh(MeshCacheKey key, BlockState state) {
-		return retextured_meshes.computeIfAbsent(key, (k) -> createUntintedRetexturedMesh(k, seed));
+		if (RETEXTURED_MESH_CACHE.containsKey(key)) return RETEXTURED_MESH_CACHE.getAndMoveToFirst(key);
+		Mesh mesh = transformMesh(key, state);
+		RETEXTURED_MESH_CACHE.putAndMoveToFirst(key, mesh);
+		return mesh;
 	}
 	
-	protected Mesh createUntintedRetexturedMesh(MeshCacheKey key, long seed) {
+	protected Mesh transformMesh(MeshCacheKey key, BlockState state) {
-		RetexturingTransformer transformer = retextured_transforms.computeIfAbsent(key.transform, (k) -> new RetexturingTransformer(k.appearance, seed));
-		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 -> {
+		AtomicInteger quad_index = new AtomicInteger();
+		getBaseMesh(key.state_key, state).forEach(quad -> {
 			int i = -1;
 			do {
 				emitter.copyFrom(quad);
-				i = transform.transform(emitter, i);
+				i = key.appearance.transformQuad(emitter, i, quad_index.get(), key.model_id, ao, uv_lock);
 			} while (i > 0);
+			// kinda weird to do it like that but other directions don't use the quad_index so it doesn't matter
+			if (quad.cullFace() == null) quad_index.getAndIncrement();
 		});
 
 		return builder.build();
 	}
 
-	public class RetexturingTransformer {
-		private final long seed;
-		protected RetexturingTransformer(CamoAppearance ta, long seed) {
-			this.ta = ta;
-			this.seed = seed;
-		}
-		
-		protected final CamoAppearance ta;
-
-		public int transform(QuadEmitter quad, int i) {
-			if(quad.tag() == 0) return 0; //Pass the quad through unmodified.
-
-			Direction direction = quad.nominalFace();
-			List<SpriteProperties> sprites = ta.getSprites(direction, seed);
-			if (i == -1) i = sprites.size();
-
-			SpriteProperties properties = sprites.get(sprites.size() - i);
-			i--;
-			QuadPosBounds bounds = properties.bounds();
-
-			if (bounds == null) { // sprite applies anywhere e.g. default behaviour
-				quad.material(ta.getRenderMaterial(ao));
-				quad.spriteBake(
-					properties.sprite(),
-					MutableQuadView.BAKE_NORMALIZED
-						| properties.flags()
-						| (uv_lock ? MutableQuadView.BAKE_LOCK_UV : 0)
-				);
-				quad.tag(i+1);
-				quad.emit();
-				return i;
-			}
-
-			// verify if sprite covers the current quad and apply the new size
-			QuadPosBounds origin_bounds = QuadPosBounds.read(quad, false);
-			if (!bounds.matches(origin_bounds)) return i;
-
-			// apply new quad shape
-			quad.material(ta.getRenderMaterial(ao));
-			bounds.intersection(origin_bounds, direction.getAxis()).apply(quad, origin_bounds);
-			quad.spriteBake( // seems to work without the flags and break with it
-				properties.sprite(),
-				MutableQuadView.BAKE_NORMALIZED
-					| MutableQuadView.BAKE_LOCK_UV
-			);
-			quad.tag(i+1);
-			quad.emit();
-			return i;
-		}
-	}
-	
 	protected static class TintingTransformer implements RenderContext.QuadTransform {
-		private final long seed;
+		private final CamoAppearance appearance;
-		protected TintingTransformer(CamoAppearance ta, int tint, long seed) {
+		private final int model_id;
-			this.ta = ta;
+		private final int tint;
-			this.tint = tint;
-			this.seed = seed;
-		}
 
-		protected final CamoAppearance ta;
+		protected TintingTransformer(CamoAppearance appearance, int model_id, int tint) {
-		protected final int tint;
+			this.appearance = appearance;
+			this.model_id = model_id;
+			this.tint = tint;
+		}
 
 		@Override
 		public boolean transform(MutableQuadView quad) {
-			if(quad.tag() == 0) return true;
+			int camo_quad_index = quad.tag() - ((quad.tag() >>> 8) << 8);
+			if(camo_quad_index == 0) return true;
 
-			if(ta.hasColor(quad.nominalFace(), seed, quad.tag())) quad.color(tint, tint, tint, tint);
+			if(appearance.hasColor(quad.nominalFace(), model_id, camo_quad_index)) quad.color(tint, tint, tint, tint);
 
 			return true;
 		}

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

@@ -43,7 +43,7 @@ public class UnbakedAutoRetexturedModel extends UnbakedRetexturedModel {
 				Renderer r = ReFramedClient.HELPER.getFabricRenderer();
 				MeshBuilder builder = r.meshBuilder();
 				QuadEmitter emitter = builder.getEmitter();
-				RenderMaterial mat = tam.getCachedMaterial(state, false);
+				RenderMaterial mat = appearance_manager.getCachedMaterial(state, false);
 				
 				Random rand = Random.create(42);
 

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

@@ -51,7 +51,7 @@ public class UnbakedJsonRetexturedModel extends UnbakedRetexturedModel {
 				Renderer r = ReFramedClient.HELPER.getFabricRenderer();
 				MeshBuilder builder = r.meshBuilder();
 				QuadEmitter emitter = builder.getEmitter();
-				RenderMaterial mat = tam.getCachedMaterial(state, false);
+				RenderMaterial mat = appearance_manager.getCachedMaterial(state, false);
 				
 				Random rand = Random.create(42);
 

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

@@ -14,7 +14,7 @@ public abstract class UnbakedRetexturedModel implements UnbakedModel {
 
     protected int theme_index = 1;
     protected BlockState item_state;
-    protected boolean ao = true;
+    protected final boolean ao = true;
 
     public UnbakedRetexturedModel(Identifier parent) {
         this.parent = parent;

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

@@ -1,13 +1,77 @@
 package fr.adrien1106.reframed.client.model.apperance;
 
+import fr.adrien1106.reframed.client.model.QuadPosBounds;
 import net.fabricmc.fabric.api.renderer.v1.material.RenderMaterial;
+import net.fabricmc.fabric.api.renderer.v1.mesh.MutableQuadView;
+import net.fabricmc.fabric.api.renderer.v1.mesh.QuadEmitter;
 import net.minecraft.util.math.Direction;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
-public interface CamoAppearance {
+public abstract class CamoAppearance {
-	@NotNull RenderMaterial getRenderMaterial(boolean ao);
+	protected final int id;
-	@NotNull List<SpriteProperties> getSprites(Direction dir, long seed);
+	protected final RenderMaterial ao_material;
-	boolean hasColor(Direction dir, long seed, int index);
+	protected final RenderMaterial material;
+
+	protected CamoAppearance(RenderMaterial ao_material, RenderMaterial material, int id) {
+		this.id = id;
+
+		this.ao_material = ao_material;
+		this.material = material;
+	}
+
+	public abstract @NotNull List<SpriteProperties> getSprites(Direction dir, int model_id);
+	public abstract boolean hasColor(Direction dir, int model_id, int index);
+
+	public @NotNull RenderMaterial getRenderMaterial(boolean ao) {
+		return ao && ao_material != null? ao_material : material;
+	}
+
+	public int transformQuad(QuadEmitter quad, int i, int quad_index, int model_id, boolean ao, boolean uv_lock) {
+		if(quad.tag() == 0) return 0; // Pass the quad through unmodified.
+
+		Direction direction = quad.nominalFace();
+		List<SpriteProperties> sprites = getSprites(direction, model_id);
+		if (i == -1) i = sprites.size();
+
+		SpriteProperties properties = sprites.get(sprites.size() - i);
+		int tag = i + (quad_index << 8);
+		i--;
+		QuadPosBounds bounds = properties.bounds();
+
+		if (bounds == null) { // sprite applies anywhere e.g. default behaviour
+			quad.material(getRenderMaterial(ao));
+			quad.spriteBake(
+				properties.sprite(),
+				MutableQuadView.BAKE_NORMALIZED
+					| properties.flags()
+					| (uv_lock ? MutableQuadView.BAKE_LOCK_UV : 0)
+			);
+			quad.tag(tag);
+			quad.emit();
+			return i;
+		}
+
+		// verify if sprite covers the current quad and apply the new size
+		QuadPosBounds origin_bounds = QuadPosBounds.read(quad, false);
+		if (!bounds.matches(origin_bounds)) return i;
+
+		// apply new quad shape
+		quad.material(getRenderMaterial(ao));
+		bounds.intersection(origin_bounds, direction.getAxis()).apply(quad, origin_bounds);
+		quad.spriteBake( // seems to work without the flags and break with it
+			properties.sprite(),
+			MutableQuadView.BAKE_NORMALIZED
+				| MutableQuadView.BAKE_LOCK_UV
+		);
+		quad.tag(tag);
+		quad.emit();
+		return i;
+	}
+
+	@Override
+	public int hashCode() {
+		return id;
+	}
 }

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

@@ -5,6 +5,7 @@ import fr.adrien1106.reframed.client.ReFramedClient;
 import fr.adrien1106.reframed.client.model.DynamicBakedModel;
 import fr.adrien1106.reframed.client.model.QuadPosBounds;
 import fr.adrien1106.reframed.mixin.model.WeightedBakedModelAccessor;
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap;
 import net.fabricmc.fabric.api.renderer.v1.Renderer;
 import net.fabricmc.fabric.api.renderer.v1.material.BlendMode;
 import net.fabricmc.fabric.api.renderer.v1.material.MaterialFinder;
@@ -29,7 +30,6 @@ import net.minecraft.util.math.random.Random;
 import net.minecraft.world.BlockRenderView;
 
 import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Function;
 
@@ -40,20 +40,20 @@ public class CamoAppearanceManager {
 		for(BlendMode blend : BlendMode.values()) {
 			finder.clear().disableDiffuse(false).blendMode(blend);
 			
-			materialsWithoutAo.put(blend, finder.ambientOcclusion(TriState.FALSE).find());
+			materials.put(blend, finder.ambientOcclusion(TriState.FALSE).find());
-			materialsWithAo.put(blend, finder.ambientOcclusion(TriState.DEFAULT).find()); //not "true" since that *forces* AO, i just want to *allow* AO
+			ao_materials.put(blend, finder.ambientOcclusion(TriState.DEFAULT).find()); //not "true" since that *forces* AO, i just want to *allow* AO
 		}
 		
 		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());
+		this.default_appearance = new SingleSpriteAppearance(sprite, materials.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());
+		this.accent_appearance = new SingleSpriteAppearance(sprite, materials.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
 
 		sprite = spriteLookup.apply(BARRIER_SPRITE_ID);
-		this.barrierItemAppearance = new SingleSpriteAppearance(sprite, materialsWithoutAo.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
+		this.barrierItemAppearance = new SingleSpriteAppearance(sprite, materials.get(BlendMode.CUTOUT), serial_number.getAndIncrement());
 	}
 
 	protected static final SpriteIdentifier DEFAULT_SPRITE_MAIN = new SpriteIdentifier(PlayerScreenHandler.BLOCK_ATLAS_TEXTURE, new Identifier(ReFramed.MODID, "block/framed_block"));
@@ -64,11 +64,15 @@ public class CamoAppearanceManager {
 	private final CamoAppearance accent_appearance;
 	private final CamoAppearance barrierItemAppearance;
 
-	private final ConcurrentHashMap<BlockState, CamoAppearance> appearanceCache = new ConcurrentHashMap<>(); //Mutable, append-only cache
+	private static final Object2ObjectLinkedOpenHashMap<BlockState, CamoAppearance> APPEARANCE_CACHE =
+        new Object2ObjectLinkedOpenHashMap<>(2048, 0.25f) {
+            @Override
+            protected void rehash(int n) {}
+        };
 	private final AtomicInteger serial_number = new AtomicInteger(0); //Mutable
 	
-	private final EnumMap<BlendMode, RenderMaterial> materialsWithAo = new EnumMap<>(BlendMode.class);
+	private final EnumMap<BlendMode, RenderMaterial> ao_materials = new EnumMap<>(BlendMode.class);
-	private final EnumMap<BlendMode, RenderMaterial> materialsWithoutAo = new EnumMap<>(BlendMode.class); //Immutable contents
+	private final EnumMap<BlendMode, RenderMaterial> materials = new EnumMap<>(BlendMode.class); //Immutable contents
 	
 	public CamoAppearance getDefaultAppearance(int appearance) {
 		return appearance == 2 ? accent_appearance: default_appearance;
@@ -81,11 +85,17 @@ public class CamoAppearanceManager {
 		if (model instanceof DynamicBakedModel dynamic_model) {
 			return computeAppearance(dynamic_model.computeQuads(world, state, pos, theme_index), state);
 		}
-		return appearanceCache.computeIfAbsent(state, block_state -> computeAppearance(model, block_state));
+
+		// refresh cache
+		if (APPEARANCE_CACHE.containsKey(state)) return APPEARANCE_CACHE.getAndMoveToFirst(state);
+
+		CamoAppearance appearance = computeAppearance(model, state);
+		APPEARANCE_CACHE.putAndMoveToFirst(state, appearance);
+		return appearance;
 	}
 	
 	public RenderMaterial getCachedMaterial(BlockState state, boolean ao) {
-		Map<BlendMode, RenderMaterial> m = ao ? materialsWithAo : materialsWithoutAo;
+		Map<BlendMode, RenderMaterial> m = ao ? ao_materials : materials;
 		return m.get(BlendMode.fromRenderLayer(RenderLayers.getBlockLayer(state)));
 	}
 	

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

@@ -6,33 +6,22 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
-public class ComputedAppearance implements CamoAppearance {
+public class ComputedAppearance extends CamoAppearance {
     private final Appearance appearance;
-    private final int id;
-    private final RenderMaterial matWithAo;
-    private final RenderMaterial matWithoutAo;
 
-    public ComputedAppearance(@NotNull Appearance appearance, RenderMaterial withAo, RenderMaterial withoutAo, int id) {
+    public ComputedAppearance(@NotNull Appearance appearance, RenderMaterial ao_material, RenderMaterial material, int id) {
+        super(ao_material, material, id);
         this.appearance = appearance;
-        this.id = id;
-
-        this.matWithAo = withAo;
-        this.matWithoutAo = withoutAo;
     }
 
     @Override
-    public @NotNull RenderMaterial getRenderMaterial(boolean ao) {
+    public @NotNull List<SpriteProperties> getSprites(Direction dir, int model_id) {
-        return ao ? matWithAo : matWithoutAo;
-    }
-
-    @Override
-    public @NotNull List<SpriteProperties> getSprites(Direction dir, long seed) {
         return appearance.sprites().get(dir);
     }
 
     @Override
-    public boolean hasColor(Direction dir, long seed, int index) {
+    public boolean hasColor(Direction dir, int model_id, int index) {
-        List<SpriteProperties> properties = getSprites(dir, seed);
+        List<SpriteProperties> properties = getSprites(dir, model_id);
         if (index != 0) index = properties.size() - index;
         return properties.get(index).has_colors();
     }
@@ -40,13 +29,7 @@ public class ComputedAppearance implements CamoAppearance {
     @Override
     public boolean equals(Object o) {
         if(this == o) return true;
-        if(o == null || getClass() != o.getClass()) return false;
+        if(!(o instanceof ComputedAppearance that)) return false;
-        ComputedAppearance that = (ComputedAppearance) o;
         return id == that.id;
     }
-
-    @Override
-    public int hashCode() {
-        return id;
-    }
 }

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

@@ -7,47 +7,33 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
-public class SingleSpriteAppearance implements CamoAppearance {
+public class SingleSpriteAppearance extends CamoAppearance {
     private final @NotNull Sprite defaultSprite;
-    private final RenderMaterial mat;
-    private final int id;
 
     public SingleSpriteAppearance(@NotNull Sprite defaultSprite, RenderMaterial mat, int id) {
+        super(null, mat, id);
         this.defaultSprite = defaultSprite;
-        this.mat = mat;
-        this.id = id;
     }
 
     @Override
-    public @NotNull RenderMaterial getRenderMaterial(boolean ao) {
+    public @NotNull List<SpriteProperties> getSprites(Direction dir, int model_id) {
-        return mat;
-    }
-
-    @Override
-    public @NotNull List<SpriteProperties> getSprites(Direction dir, long seed) {
         return List.of(new SpriteProperties(defaultSprite, 0, null, false));
     }
 
     @Override
-    public boolean hasColor(Direction dir, long seed, int index) {
+    public boolean hasColor(Direction dir, int model_id, int index) {
         return false;
     }
 
     @Override
     public boolean equals(Object o) {
         if(this == o) return true;
-        if(o == null || getClass() != o.getClass()) return false;
+        if(!(o instanceof SingleSpriteAppearance that)) return false;
-        SingleSpriteAppearance that = (SingleSpriteAppearance) o;
         return id == that.id;
     }
 
-    @Override
-    public int hashCode() {
-        return id;
-    }
-
     @Override
     public String toString() {
-        return "SingleSpriteAppearance[defaultSprite=%s, mat=%s, id=%d]".formatted(defaultSprite, mat, id);
+        return "SingleSpriteAppearance[defaultSprite=%s, mat=%s, id=%d]".formatted(defaultSprite, material, id);
     }
 }

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

@@ -9,25 +9,14 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
-public class WeightedComputedAppearance implements CamoAppearance {
+public class WeightedComputedAppearance extends CamoAppearance {
     private final List<Weighted.Present<Appearance>> appearances;
     private final int total_weight;
-    private final int id;
-    private final RenderMaterial matWithAo;
-    private final RenderMaterial matWithoutAo;
 
-    public WeightedComputedAppearance(@NotNull List<Weighted.Present<Appearance>> appearances, RenderMaterial withAo, RenderMaterial withoutAo, int id) {
+    public WeightedComputedAppearance(@NotNull List<Weighted.Present<Appearance>> appearances, RenderMaterial ao_material, RenderMaterial material, int id) {
+        super(ao_material, material, id);
         this.appearances = appearances;
         this.total_weight = Weighting.getWeightSum(appearances);
-        this.id = id;
-
-        this.matWithAo = withAo;
-        this.matWithoutAo = withoutAo;
-    }
-
-    @Override
-    public @NotNull RenderMaterial getRenderMaterial(boolean ao) {
-        return ao ? matWithAo : matWithoutAo;
     }
 
 
@@ -37,21 +26,19 @@ public class WeightedComputedAppearance implements CamoAppearance {
             .map(appearances::indexOf).orElse(0);
     }
 
-    private Appearance getAppearance(long seed) {
+    private Appearance getAppearance(int model_id) {
-        Random random = Random.create(seed);
+        return appearances.get(model_id).getData();
-        return Weighting.getAt(appearances, Math.abs((int)random.nextLong()) % total_weight)
-            .map(Weighted.Present::getData).get();
     }
 
     @Override
-    public @NotNull List<SpriteProperties> getSprites(Direction dir, long seed) {
+    public @NotNull List<SpriteProperties> getSprites(Direction dir, int model_id) {
-        return getAppearance(seed).sprites().get(dir);
+        return getAppearance(model_id).sprites().get(dir);
     }
 
 
     @Override
-    public boolean hasColor(Direction dir, long seed, int index) {
+    public boolean hasColor(Direction dir, int model_id, int index) {
-        List<SpriteProperties> properties = getSprites(dir, seed);
+        List<SpriteProperties> properties = getSprites(dir, model_id);
         if (index != 0) index = properties.size() - index;
         return properties.get(index).has_colors();
     }
@@ -59,13 +46,7 @@ public class WeightedComputedAppearance implements CamoAppearance {
     @Override
     public boolean equals(Object o) {
         if(this == o) return true;
-        if(o == null || getClass() != o.getClass()) return false;
+        if(!(o instanceof WeightedComputedAppearance that)) return false;
-        WeightedComputedAppearance that = (WeightedComputedAppearance) o;
         return id == that.id;
     }
-
-    @Override
-    public int hashCode() {
-        return id;
-    }
 }

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

@@ -17,9 +17,7 @@ public class GLanguage extends FabricLanguageProvider {
     public void generateTranslations(TranslationBuilder builder) {
         builder.add(Registries.ITEM_GROUP.getKey(ReFramed.ITEM_GROUP).get(), "Frames");
         builder.add("advancements.reframed.description", "Get all the frame types.");
-        ReFramed.BLOCKS.forEach(block -> {
+        ReFramed.BLOCKS.forEach(block -> builder.add(block, beautify(Registries.BLOCK.getId(block).getPath()) + " Frame"));
-            builder.add(block, beautify(Registries.BLOCK.getId(block).getPath()) + " Frame");
-        });
     }
 
     private static String beautify(String name) {

src/main/java/fr/adrien1106/reframed/mixin/BlockItemMixin.java

@@ -11,9 +11,7 @@ import net.minecraft.nbt.NbtCompound;
 import net.minecraft.nbt.NbtHelper;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
-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.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
@@ -23,8 +21,6 @@ import static fr.adrien1106.reframed.block.ReFramedEntity.BLOCKSTATE_KEY;
 @Mixin(BlockItem.class)
 public class BlockItemMixin {
 
-    @Shadow @Final @Deprecated private Block block;
-
     @Inject(
         method = "writeNbtToBlockEntity",
         at = @At(
@@ -41,6 +37,7 @@ public class BlockItemMixin {
             || !Block.isShapeFullCube(block.getBlock().getDefaultState().getCollisionShape(world, pos))
         ) return;
         NbtCompound new_comp = new NbtCompound();
+        player.getOffHandStack().decrement(1);
         new_comp.put(BLOCKSTATE_KEY + 1, NbtHelper.fromBlockState(block.getBlock().getDefaultState()));
         compound.set(new_comp);
     }

src/main/java/fr/adrien1106/reframed/mixin/CompatMixinPlugin.java

@@ -21,9 +21,11 @@ public class CompatMixinPlugin implements IMixinConfigPlugin {
         "fr.adrien1106.reframed.mixin.compat.AthenaBakedModelMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(0)),
         "fr.adrien1106.reframed.mixin.compat.AthenaWrappedGetterMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(0)),
         "fr.adrien1106.reframed.mixin.render.TerrainRenderContextMixin", () -> !LOADER.isModLoaded(COMPAT_MOD.get(1)),
-        "fr.adrien1106.reframed.mixin.compat.IndiumTerrainRenderContextMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(1)),
         "fr.adrien1106.reframed.mixin.render.BlockRenderInfoMixin", () -> !LOADER.isModLoaded(COMPAT_MOD.get(1)),
+        "fr.adrien1106.reframed.mixin.render.AbstractBlockRenderContextMixin", () -> !LOADER.isModLoaded(COMPAT_MOD.get(1)),
+        "fr.adrien1106.reframed.mixin.compat.IndiumTerrainRenderContextMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(1)),
         "fr.adrien1106.reframed.mixin.compat.IndiumTerrainBlockRenderInfoMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(1)),
+        "fr.adrien1106.reframed.mixin.compat.IndiumAbstractBlockRenderContextMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(1)),
         "fr.adrien1106.reframed.mixin.compat.SodiumBlockOcclusionCacheMixin", () -> LOADER.isModLoaded(COMPAT_MOD.get(2))
     );
 

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

@@ -6,7 +6,7 @@ import earth.terrarium.athena.api.client.models.AthenaBlockModel;
 import fr.adrien1106.reframed.client.ReFramedClient;
 import fr.adrien1106.reframed.client.model.DynamicBakedModel;
 import fr.adrien1106.reframed.compat.RebakedAthenaModel;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import net.fabricmc.fabric.api.renderer.v1.Renderer;
 import net.fabricmc.fabric.api.renderer.v1.mesh.MutableQuadView;

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

@@ -3,7 +3,7 @@ package fr.adrien1106.reframed.mixin.compat;
 import earth.terrarium.athena.api.client.utils.AppearanceAndTintGetter;
 import earth.terrarium.athena.api.client.utils.CtmUtils;
 import earth.terrarium.athena.impl.client.models.ConnectedBlockModel;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;

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

@@ -2,7 +2,7 @@ package fr.adrien1106.reframed.mixin.compat;
 
 import com.llamalad7.mixinextras.sugar.Local;
 import earth.terrarium.athena.api.client.fabric.WrappedGetter;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.BlockRenderView;

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

@@ -0,0 +1,29 @@
+package fr.adrien1106.reframed.mixin.compat;
+
+import com.llamalad7.mixinextras.sugar.Local;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
+import link.infra.indium.renderer.mesh.MutableQuadViewImpl;
+import link.infra.indium.renderer.render.AbstractBlockRenderContext;
+import link.infra.indium.renderer.render.BlockRenderInfo;
+import net.minecraft.util.math.Direction;
+import org.jetbrains.annotations.Nullable;
+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(AbstractBlockRenderContext.class)
+public abstract class IndiumAbstractBlockRenderContextMixin {
+
+    @Shadow(remap = false) protected BlockRenderInfo blockInfo;
+
+    @Shadow public abstract boolean isFaceCulled(@Nullable Direction face);
+
+    @Redirect(method = "renderQuad", at = @At(value = "INVOKE", target = "Llink/infra/indium/renderer/render/AbstractBlockRenderContext;isFaceCulled(Lnet/minecraft/util/math/Direction;)Z"))
+    private boolean shouldDrawInnerQuad(AbstractBlockRenderContext instance, Direction face, @Local(argsOnly = true) MutableQuadViewImpl quad) {
+        if (face != null || quad.tag() == 0 || !(blockInfo instanceof IBlockRenderInfoMixin info) || info.getThemeIndex() == 0) return isFaceCulled(face);
+
+        return !BlockHelper.shouldDrawInnerFace(blockInfo.blockState, blockInfo.blockView, blockInfo.blockPos, quad.tag() >>> 8, info.getThemeIndex());
+    }
+}

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

@@ -1,8 +1,8 @@
 package fr.adrien1106.reframed.mixin.compat;
 
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import link.infra.indium.renderer.render.BlockRenderInfo;
 import link.infra.indium.renderer.render.TerrainBlockRenderInfo;
 import me.jellysquid.mods.sodium.client.render.chunk.compile.pipeline.BlockOcclusionCache;
@@ -18,7 +18,7 @@ import org.spongepowered.asm.mixin.injection.Redirect;
 @Mixin(TerrainBlockRenderInfo.class)
 public abstract class IndiumTerrainBlockRenderInfoMixin extends BlockRenderInfo implements IBlockRenderInfoMixin {
 
-    @Unique private int theme_index = 1;
+    @Unique private int theme_index = 0;
 
     @Redirect(
         method = "shouldDrawFaceInner",
@@ -40,4 +40,9 @@ public abstract class IndiumTerrainBlockRenderInfoMixin extends BlockRenderInfo
         this.theme_index = theme_index;
         prepareForBlock(blockState, blockPos, seed, modelAo);
     }
+
+    @Override
+    public int getThemeIndex() {
+        return theme_index;
+    }
 }

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

@@ -1,11 +1,13 @@
 package fr.adrien1106.reframed.mixin.compat;
 
 import fr.adrien1106.reframed.client.model.MultiRetexturableModel;
-import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.mixin.IMultipartBakedModelMixin;
 import link.infra.indium.renderer.render.AbstractBlockRenderContext;
 import link.infra.indium.renderer.render.TerrainRenderContext;
 import me.jellysquid.mods.sodium.client.render.chunk.compile.pipeline.BlockRenderContext;
+import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
 import net.minecraft.client.render.model.BakedModel;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
@@ -29,13 +31,14 @@ public abstract class IndiumTerrainRenderContextMixin extends AbstractBlockRende
         if (!(ctx.model() instanceof IMultipartBakedModelMixin wrapped)
             || !(wrapped.getModel(ctx.state()) instanceof MultiRetexturableModel retexturing_model)) return;
 
-        List<BakedModel> models = retexturing_model.models();
+        List<ForwardingBakedModel> models = retexturing_model.models();
+        BlockHelper.computeInnerCull(ctx.state(), models);
         int i = 0;
-        for (BakedModel bakedModel : models) {
+        for (BakedModel model : models) {
             i++;
             aoCalc.clear();
-            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(ctx.state(), ctx.pos(), ctx.seed(), bakedModel.useAmbientOcclusion(), i);
+            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(ctx.state(), ctx.pos(), ctx.seed(), model.useAmbientOcclusion(), i);
-            bakedModel.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
+            model.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
         }
         ci.cancel();
     }

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

@@ -1,8 +1,8 @@
 package fr.adrien1106.reframed.mixin.compat;
 
 import com.llamalad7.mixinextras.sugar.Local;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import me.jellysquid.mods.sodium.client.render.chunk.compile.pipeline.BlockOcclusionCache;
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;

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

@@ -1,7 +1,7 @@
 package fr.adrien1106.reframed.mixin.particles;
 
 import fr.adrien1106.reframed.block.ReFramedBlock;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.particle.BlockDustParticle;

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

@@ -2,7 +2,7 @@ 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 fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.Entity;
 import net.minecraft.util.math.BlockPos;

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

@@ -2,7 +2,7 @@ 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 fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;

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

@@ -0,0 +1,36 @@
+package fr.adrien1106.reframed.mixin.render;
+
+import com.llamalad7.mixinextras.sugar.Local;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
+import net.fabricmc.fabric.impl.client.indigo.renderer.mesh.MutableQuadViewImpl;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.AbstractBlockRenderContext;
+import net.fabricmc.fabric.impl.client.indigo.renderer.render.BlockRenderInfo;
+import net.minecraft.util.math.Direction;
+import org.jetbrains.annotations.Nullable;
+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(AbstractBlockRenderContext.class)
+public abstract class AbstractBlockRenderContextMixin {
+
+    @Shadow public abstract boolean isFaceCulled(@Nullable Direction face);
+
+    @Shadow(remap = false) @Final protected BlockRenderInfo blockInfo;
+
+    @Redirect(
+        method = "renderQuad",
+        at = @At(
+            value = "INVOKE",
+            target = "Lnet/fabricmc/fabric/impl/client/indigo/renderer/render/AbstractBlockRenderContext;isFaceCulled(Lnet/minecraft/util/math/Direction;)Z"
+        )
+    )
+    private boolean shouldDrawInnerQuad(AbstractBlockRenderContext instance, Direction face, @Local(argsOnly = true) MutableQuadViewImpl quad) {
+        if (face != null || quad.tag() == 0 || !(blockInfo instanceof IBlockRenderInfoMixin info) || info.getThemeIndex() == 0) return isFaceCulled(face);
+
+        return !BlockHelper.shouldDrawInnerFace(blockInfo.blockState, blockInfo.blockView, blockInfo.blockPos, quad.tag() >>> 8, info.getThemeIndex());
+    }
+}

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

@@ -1,9 +1,9 @@
 package fr.adrien1106.reframed.mixin.render;
 
 import com.llamalad7.mixinextras.sugar.Local;
-import fr.adrien1106.reframed.util.BlockHelper;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.fabricmc.fabric.impl.client.indigo.renderer.render.BlockRenderInfo;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
@@ -24,8 +24,7 @@ public abstract class BlockRenderInfoMixin implements IBlockRenderInfoMixin {
     @Shadow public abstract void prepareForBlock(BlockState blockState, BlockPos blockPos, boolean modelAo);
 
     @Shadow public BlockRenderView blockView;
-    @Unique
+    @Unique private int theme_index = 0;
-    private int theme_index = 1;
 
     @ModifyArg(method = "prepareForBlock",
         at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/RenderLayers;" +
@@ -47,4 +46,9 @@ public abstract class BlockRenderInfoMixin implements IBlockRenderInfoMixin {
         this.theme_index = theme_index;
         prepareForBlock(state, pos, ao);
     }
+
+    @Override
+    public int getThemeIndex() {
+        return theme_index;
+    }
 }

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

@@ -1,6 +1,6 @@
 package fr.adrien1106.reframed.mixin.render;
 
-import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import fr.adrien1106.reframed.util.mixin.IMultipartBakedModelMixin;
 import net.minecraft.block.BlockState;
 import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.render.model.MultipartBakedModel;

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

@@ -1,8 +1,10 @@
 package fr.adrien1106.reframed.mixin.render;
 
 import fr.adrien1106.reframed.client.model.MultiRetexturableModel;
-import fr.adrien1106.reframed.util.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.blocks.BlockHelper;
-import fr.adrien1106.reframed.util.IMultipartBakedModelMixin;
+import fr.adrien1106.reframed.util.mixin.IBlockRenderInfoMixin;
+import fr.adrien1106.reframed.util.mixin.IMultipartBakedModelMixin;
+import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
 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;
@@ -28,13 +30,14 @@ public abstract class TerrainRenderContextMixin extends AbstractBlockRenderConte
         if (!(wrapper instanceof IMultipartBakedModelMixin wrapped)
             || !(wrapped.getModel(state) instanceof MultiRetexturableModel retexturing_model)) return;
 
-        List<BakedModel> models = retexturing_model.models();
+        List<ForwardingBakedModel> models = retexturing_model.models();
+        BlockHelper.computeInnerCull(state, models);
         int i = 0;
-        for (BakedModel bakedModel : models) {
+        for (BakedModel model : models) {
             i++;
             aoCalc.clear();
-            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(state, pos, bakedModel.useAmbientOcclusion(), i);
+            ((IBlockRenderInfoMixin) blockInfo).prepareForBlock(state, pos, model.useAmbientOcclusion(), i);
-            bakedModel.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
+            model.emitBlockQuads(blockInfo.blockView, blockInfo.blockState, blockInfo.blockPos, blockInfo.randomSupplier, this);
         }
         ci.cancel();
     }

src/main/java/fr/adrien1106/reframed/mixin/sound/BlockItemMixin.java

@@ -2,7 +2,7 @@ package fr.adrien1106.reframed.mixin.sound;
 
 import com.llamalad7.mixinextras.sugar.Local;
 import fr.adrien1106.reframed.block.ReFramedBlock;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.item.BlockItem;

src/main/java/fr/adrien1106/reframed/mixin/sound/EntityMixin.java

@@ -2,7 +2,7 @@ package fr.adrien1106.reframed.mixin.sound;
 
 import com.llamalad7.mixinextras.sugar.Local;
 import fr.adrien1106.reframed.block.ReFramedBlock;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.entity.Entity;

src/main/java/fr/adrien1106/reframed/mixin/sound/LivingEntityMixin.java

@@ -1,7 +1,7 @@
 package fr.adrien1106.reframed.mixin.sound;
 
 import fr.adrien1106.reframed.block.ReFramedBlock;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.entity.LivingEntity;

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

@@ -2,7 +2,7 @@ package fr.adrien1106.reframed.mixin.sound;
 
 import com.llamalad7.mixinextras.sugar.Local;
 import fr.adrien1106.reframed.block.ReFramedBlock;
-import fr.adrien1106.reframed.util.ThemeableBlockEntity;
+import fr.adrien1106.reframed.util.blocks.ThemeableBlockEntity;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.client.render.WorldRenderer;

src/main/java/fr/adrien1106/reframed/util/blocks/BlockHelper.java

@@ -1,9 +1,15 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.blocks;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import fr.adrien1106.reframed.block.ReFramedBlock;
 import fr.adrien1106.reframed.block.ReFramedEntity;
-import fr.adrien1106.reframed.util.property.Corner;
+import fr.adrien1106.reframed.client.ReFramedClient;
-import fr.adrien1106.reframed.util.property.StairShape;
+import fr.adrien1106.reframed.client.model.QuadPosBounds;
+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.QuadEmitter;
+import net.fabricmc.fabric.api.renderer.v1.model.ForwardingBakedModel;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockEntityProvider;
 import net.minecraft.block.BlockState;
@@ -19,24 +25,32 @@ 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.math.random.Random;
 import net.minecraft.util.shape.VoxelShape;
 import net.minecraft.util.shape.VoxelShapes;
+import net.minecraft.world.BlockRenderView;
 import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import static fr.adrien1106.reframed.util.BlockProperties.CORNER;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.CORNER;
-import static fr.adrien1106.reframed.util.BlockProperties.LIGHT;
+import static fr.adrien1106.reframed.util.blocks.BlockProperties.LIGHT;
-import static fr.adrien1106.reframed.util.property.StairShape.*;
+import static fr.adrien1106.reframed.util.blocks.StairShape.*;
 import static net.minecraft.util.shape.VoxelShapes.combine;
 
 public class BlockHelper {
 
+    // self culling cache of the models not made thread local so that it is only computed once
+    private static final Cache<CullElement, Integer[]> INNER_CULL_MAP = CacheBuilder.newBuilder().maximumSize(1024).build();
+
+    private record CullElement(Object state_key, int model) {}
+
     public static Corner getPlacementCorner(ItemPlacementContext ctx) {
         Direction side = ctx.getSide().getOpposite();
         Vec3d pos = getHitPos(ctx.getHitPos(), ctx.getBlockPos());
@@ -58,7 +72,7 @@ public class BlockHelper {
             Math.abs(axis_1.choose(pos.x, pos.y, pos.z)) > Math.abs(axis_2.choose(pos.x, pos.y, pos.z))
                 ? axis_1
                 : axis_2
-        ).get();
+        ).orElse(null);
     }
 
     public static Vec3d getRelativePos(Vec3d pos, BlockPos block_pos) {
@@ -205,6 +219,66 @@ public class BlockHelper {
         return ActionResult.PASS;
     }
 
+    /**
+     * compute which quad might cull with another model quad
+     * @param state - the state of the model
+     * @param models - list of models on the same block
+     */
+    public static void computeInnerCull(BlockState state, List<ForwardingBakedModel> models) {
+        if (!(state.getBlock() instanceof ReFramedBlock frame_block)) return;
+        Object key = frame_block.getModelCacheKey(state);
+        if (INNER_CULL_MAP.asMap().containsKey(new CullElement(key, 1))) return;
+
+        Renderer r = ReFramedClient.HELPER.getFabricRenderer();
+        QuadEmitter quad_emitter = r.meshBuilder().getEmitter();
+        RenderMaterial material = r.materialFinder().clear().find();
+        Random random = Random.create();
+
+        List<List<QuadPosBounds>> model_bounds = models.stream()
+            .map(ForwardingBakedModel::getWrappedModel)
+            .filter(Objects::nonNull)
+            .map(wrapped -> wrapped.getQuads(state, null, random))
+            .map(quads -> quads.stream().map(quad -> {
+                quad_emitter.fromVanilla(quad, material, null);
+                return QuadPosBounds.read(quad_emitter, false);
+            }).toList()).toList();
+
+        Integer[] cull_array;
+        for(int self_id = 1; self_id <= model_bounds.size(); self_id++) {
+            List<QuadPosBounds> self_bounds = model_bounds.get(self_id - 1);
+            cull_array = new Integer[self_bounds.size()];
+            for (int self_quad = 0; self_quad < cull_array.length; self_quad++) {
+                QuadPosBounds self_bound = self_bounds.get(self_quad);
+                for(int other_id = 1; other_id <= model_bounds.size(); other_id++) {
+                    if (other_id == self_id) continue;
+                    if (model_bounds.get(other_id - 1).stream().anyMatch(other_bound -> other_bound.equals(self_bound))) {
+                        cull_array[self_quad] = other_id;
+                        break;
+                    }
+                }
+            }
+            INNER_CULL_MAP.put(new CullElement(key, self_id), cull_array);
+        }
+    }
+
+    public static boolean shouldDrawInnerFace(BlockState state, BlockRenderView view, BlockPos pos, int quad_index, int theme_index) {
+        if ( !(state.getBlock() instanceof ReFramedBlock frame_block)
+            || !(view.getBlockEntity(pos) instanceof ThemeableBlockEntity frame_entity)
+        ) return true;
+        CullElement key = new CullElement(frame_block.getModelCacheKey(state), theme_index);
+        if (!INNER_CULL_MAP.asMap().containsKey(key)) return true;
+
+        // needs to be Integer object because array is initialized with null not 0
+        Integer cull_theme = Objects.requireNonNull(INNER_CULL_MAP.getIfPresent(key))[quad_index];
+        if (cull_theme == null) return true; // no culling possible
+
+        BlockState self_theme = frame_entity.getTheme(theme_index);
+        BlockState other_theme = frame_entity.getTheme(cull_theme);
+
+        if (self_theme.isSideInvisible(other_theme, null)) return false;
+        return !self_theme.isOpaque() || !other_theme.isOpaque();
+    }
+
     // 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;

src/main/java/fr/adrien1106/reframed/util/blocks/BlockProperties.java

@@ -1,7 +1,5 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.blocks;
 
-import fr.adrien1106.reframed.util.property.Corner;
-import fr.adrien1106.reframed.util.property.StairShape;
 import net.minecraft.state.property.BooleanProperty;
 import net.minecraft.state.property.EnumProperty;
 

src/main/java/fr/adrien1106/reframed/util/blocks/Corner.java

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util.property;
+package fr.adrien1106.reframed.util.blocks;
 
 import net.minecraft.util.StringIdentifiable;
 import net.minecraft.util.math.Direction;

src/main/java/fr/adrien1106/reframed/util/blocks/ReframedInteractible.java

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.blocks;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;

src/main/java/fr/adrien1106/reframed/util/blocks/StairShape.java

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util.property;
+package fr.adrien1106.reframed.util.blocks;
 
 import net.minecraft.util.StringIdentifiable;
 

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

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.blocks;
 
 import net.minecraft.block.BlockState;
 

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

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.mixin;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;
@@ -8,4 +8,6 @@ public interface IBlockRenderInfoMixin {
     void prepareForBlock(BlockState state, BlockPos pos, boolean ao, int theme_index);
 
     void prepareForBlock(BlockState state, BlockPos pos, long seed, boolean ao, int theme_index);
+
+    int getThemeIndex();
 }

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

@@ -1,4 +1,4 @@
-package fr.adrien1106.reframed.util;
+package fr.adrien1106.reframed.util.mixin;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.client.render.model.BakedModel;

src/main/resources/fabric.mod.json

@@ -30,7 +30,7 @@
 		"fabricloader": "^${loader_version}",
 		"fabric-api": "*"
 	},
-	"suggest": {
+	"suggests": {
 		"athena": "^${athena_version}",
 		"sodium": "^${sodium_version}",
 		"indium": "^${indium_version}"

src/main/resources/reframed.mixins.json

@@ -14,6 +14,7 @@
     "compat.AthenaBakedModelMixin",
     "compat.AthenaConnectedBlockModelMixin",
     "compat.AthenaWrappedGetterMixin",
+    "compat.IndiumAbstractBlockRenderContextMixin",
     "compat.IndiumTerrainBlockRenderInfoMixin",
     "compat.IndiumTerrainRenderContextMixin",
     "compat.SodiumBlockOcclusionCacheMixin",
@@ -21,6 +22,7 @@
     "particles.AccessorParticle",
     "particles.AccessorSpriteBillboardParticle",
     "particles.MixinBlockDustParticle",
+    "render.AbstractBlockRenderContextMixin",
     "render.BlockRenderInfoMixin",
     "render.MultipartBakedModelMixin",
     "render.TerrainRenderContextMixin",