diff --git a/src/main/java/com/jozufozu/flywheel/api/Instancer.java b/src/main/java/com/jozufozu/flywheel/api/Instancer.java
index 8ea0c3f70..5b6ac1cb4 100644
--- a/src/main/java/com/jozufozu/flywheel/api/Instancer.java
+++ b/src/main/java/com/jozufozu/flywheel/api/Instancer.java
@@ -50,4 +50,14 @@ public interface Instancer<D extends InstanceData> {
 	 * </p>
 	 */
 	void notifyRemoval();
+
+	/**
+	 * Populate arr with new instances of this model.
+	 * @param arr An array to fill.
+	 */
+	default void createInstances(D[] arr) {
+		for (int i = 0; i < arr.length; i++) {
+			arr[i] = createInstance();
+		}
+	}
 }
diff --git a/src/main/java/com/jozufozu/flywheel/backend/instancing/InstancedRenderRegistry.java b/src/main/java/com/jozufozu/flywheel/backend/instancing/InstancedRenderRegistry.java
index 87f43a90e..1946dabdb 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/instancing/InstancedRenderRegistry.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/instancing/InstancedRenderRegistry.java
@@ -21,89 +21,177 @@ import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 
+/**
+ * A utility class for registering and retrieving {@code InstancingController}s.
+ */
+@SuppressWarnings("unchecked")
 public class InstancedRenderRegistry {
+	/**
+	 * Checks if the given block entity type can be instanced.
+	 * @param type The block entity type to check.
+	 * @param <T> The type of the block entity.
+	 * @return {@code true} if the block entity type can be instanced.
+	 */
 	public static <T extends BlockEntity> boolean canInstance(BlockEntityType<? extends T> type) {
-		return getBlockEntityController(type) != null;
+		return getController(type) != null;
 	}
 
+	/**
+	 * Checks if the given entity type can be instanced.
+	 * @param type The entity type to check.
+	 * @param <T> The type of the entity.
+	 * @return {@code true} if the entity type can be instanced.
+	 */
 	public static <T extends Entity> boolean canInstance(EntityType<? extends T> type) {
-		return getEntityController(type) != null;
+		return getController(type) != null;
 	}
 
+	/**
+	 * Creates an instance for the given block entity, if possible.
+	 * @param materialManager The material manager to use.
+	 * @param blockEntity The block entity to create an instance of.
+	 * @param <T> The type of the block entity.
+	 * @return An instance of the block entity, or {@code null} if the block entity cannot be instanced.
+	 */
 	@Nullable
 	public static <T extends BlockEntity> BlockEntityInstance<? super T> createInstance(MaterialManager materialManager, T blockEntity) {
-		BlockEntityInstancingController<? super T> controller = getBlockEntityController(getType(blockEntity));
+		BlockEntityInstancingController<? super T> controller = getController(getType(blockEntity));
 		if (controller == null) {
 			return null;
 		}
 		return controller.createInstance(materialManager, blockEntity);
 	}
 
+	/**
+	 * Creates an instance for the given entity, if possible.
+	 * @param materialManager The material manager to use.
+	 * @param entity The entity to create an instance of.
+	 * @param <T> The type of the entity.
+	 * @return An instance of the entity, or {@code null} if the entity cannot be instanced.
+	 */
 	@Nullable
 	public static <T extends Entity> EntityInstance<? super T> createInstance(MaterialManager materialManager, T entity) {
-		EntityInstancingController<? super T> controller = getEntityController(getType(entity));
+		EntityInstancingController<? super T> controller = getController(getType(entity));
 		if (controller == null) {
 			return null;
 		}
 		return controller.createInstance(materialManager, entity);
 	}
 
+	/**
+	 * Checks if the given block entity is instanced and should not be rendered normally.
+	 * @param blockEntity The block entity to check.
+	 * @param <T> The type of the block entity.
+	 * @return {@code true} if the block entity is instanced and should not be rendered normally.
+	 */
 	public static <T extends BlockEntity> boolean shouldSkipRender(T blockEntity) {
-		BlockEntityInstancingController<? super T> controller = getBlockEntityController(getType(blockEntity));
+		BlockEntityInstancingController<? super T> controller = getController(getType(blockEntity));
 		if (controller == null) {
 			return false;
 		}
 		return controller.shouldSkipRender(blockEntity);
 	}
 
+	/**
+	 * Checks if the given entity is instanced and should not be rendered normally.
+	 * @param entity The entity to check.
+	 * @param <T> The type of the entity.
+	 * @return {@code true} if the entity is instanced and should not be rendered normally.
+	 */
 	public static <T extends Entity> boolean shouldSkipRender(T entity) {
-		EntityInstancingController<? super T> controller = getEntityController(getType(entity));
+		EntityInstancingController<? super T> controller = getController(getType(entity));
 		if (controller == null) {
 			return false;
 		}
 		return controller.shouldSkipRender(entity);
 	}
 
+	/**
+	 * Get an object to configure the instancing controller for the given block entity type.
+	 * @param type The block entity type to configure.
+	 * @param <T> The type of the block entity.
+	 * @return The configuration object.
+	 */
 	public static <T extends BlockEntity> BlockEntityConfig<T> configure(BlockEntityType<T> type) {
 		return new BlockEntityConfig<>(type);
 	}
 
+	/**
+	 * Get an object to configure the instancing controller for the given entity type.
+	 * @param type The entity type to configure.
+	 * @param <T> The type of the entity.
+	 * @return The configuration object.
+	 */
 	public static <T extends Entity> EntityConfig<T> configure(EntityType<T> type) {
 		return new EntityConfig<>(type);
 	}
 
-	@SuppressWarnings("unchecked")
+	/**
+	 * Gets the instancing controller for the given block entity type, if one exists.
+	 * @param type The block entity type to get the instancing controller for.
+	 * @param <T> The type of the block entity.
+	 * @return The instancing controller for the given block entity type, or {@code null} if none exists.
+	 */
 	@Nullable
-	public static <T extends BlockEntity> BlockEntityInstancingController<? super T> getBlockEntityController(BlockEntityType<T> type) {
+	public static <T extends BlockEntity> BlockEntityInstancingController<? super T> getController(BlockEntityType<T> type) {
 		return ((BlockEntityTypeExtension<T>) type).flywheel$getInstancingController();
 	}
 
-	@SuppressWarnings("unchecked")
-	public static <T extends BlockEntity> void setBlockEntityController(BlockEntityType<T> type, BlockEntityInstancingController<? super T> instancingController) {
-		((BlockEntityTypeExtension<T>) type).flywheel$setInstancingController(instancingController);
-	}
-
-	@SuppressWarnings("unchecked")
+	/**
+	 * Gets the instancing controller for the given entity type, if one exists.
+	 * @param type The entity type to get the instancing controller for.
+	 * @param <T> The type of the entity.
+	 * @return The instancing controller for the given entity type, or {@code null} if none exists.
+	 */
 	@Nullable
-	public static <T extends Entity> EntityInstancingController<? super T> getEntityController(EntityType<T> type) {
+	public static <T extends Entity> EntityInstancingController<? super T> getController(EntityType<T> type) {
 		return ((EntityTypeExtension<T>) type).flywheel$getInstancingController();
 	}
 
-	@SuppressWarnings("unchecked")
-	public static <T extends Entity> void setEntityController(EntityType<T> type, EntityInstancingController<? super T> instancingController) {
+	/**
+	 * Sets the instancing controller for the given block entity type.
+	 * @param type The block entity type to set the instancing controller for.
+	 * @param instancingController The instancing controller to set.
+	 * @param <T> The type of the block entity.
+	 */
+	public static <T extends BlockEntity> void setController(BlockEntityType<T> type, BlockEntityInstancingController<? super T> instancingController) {
+		((BlockEntityTypeExtension<T>) type).flywheel$setInstancingController(instancingController);
+	}
+
+	/**
+	 * Sets the instancing controller for the given entity type.
+	 * @param type The entity type to set the instancing controller for.
+	 * @param instancingController The instancing controller to set.
+	 * @param <T> The type of the entity.
+	 */
+	public static <T extends Entity> void setController(EntityType<T> type, EntityInstancingController<? super T> instancingController) {
 		((EntityTypeExtension<T>) type).flywheel$setInstancingController(instancingController);
 	}
 
-	@SuppressWarnings("unchecked")
+	/**
+	 * Gets the type of the given block entity.
+	 * @param blockEntity The block entity to get the type of.
+	 * @param <T> The type of the block entity.
+	 * @return The {@link BlockEntityType} associated with the given block entity.
+	 */
 	public static <T extends BlockEntity> BlockEntityType<? super T> getType(T blockEntity) {
 		return (BlockEntityType<? super T>) blockEntity.getType();
 	}
 
-	@SuppressWarnings("unchecked")
+	/**
+	 * Gets the type of the given entity.
+	 * @param entity The entity to get the type of.
+	 * @param <T> The type of the entity.
+	 * @return The {@link EntityType} associated with the given entity.
+	 */
 	public static <T extends Entity> EntityType<? super T> getType(T entity) {
 		return (EntityType<? super T>) entity.getType();
 	}
 
+	/**
+	 * An object to configure the instancing controller for a block entity.
+	 * @param <T> The type of the block entity.
+	 */
 	public static class BlockEntityConfig<T extends BlockEntity> {
 		protected BlockEntityType<T> type;
 		protected BiFunction<MaterialManager, T, BlockEntityInstance<? super T>> instanceFactory;
@@ -113,32 +201,54 @@ public class InstancedRenderRegistry {
 			this.type = type;
 		}
 
+		/**
+		 * Sets the instance factory for the block entity.
+		 * @param instanceFactory The instance factory.
+		 * @return {@code this}
+		 */
 		public BlockEntityConfig<T> factory(BiFunction<MaterialManager, T, BlockEntityInstance<? super T>> instanceFactory) {
 			this.instanceFactory = instanceFactory;
 			return this;
 		}
 
+		/**
+		 * Sets a predicate to determine whether to skip rendering a block entity.
+		 * @param skipRender The predicate.
+		 * @return {@code this}
+		 */
 		public BlockEntityConfig<T> skipRender(Predicate<T> skipRender) {
 			this.skipRender = skipRender;
 			return this;
 		}
 
+		/**
+		 * Sets a predicate to always skip rendering for block entities of this type.
+		 * @return {@code this}
+		 */
 		public BlockEntityConfig<T> alwaysSkipRender() {
 			this.skipRender = be -> true;
 			return this;
 		}
 
+		/**
+		 * Constructs the block entity instancing controller, and sets it for the block entity type.
+		 * @return The block entity instancing controller.
+		 */
 		public SimpleBlockEntityInstancingController<T> apply() {
 			Objects.requireNonNull(instanceFactory, "Instance factory cannot be null!");
 			if (skipRender == null) {
 				skipRender = be -> false;
 			}
 			SimpleBlockEntityInstancingController<T> controller = new SimpleBlockEntityInstancingController<>(instanceFactory, skipRender);
-			setBlockEntityController(type, controller);
+			setController(type, controller);
 			return controller;
 		}
 	}
 
+	/**
+	 * An object to configure the instancing controller for an entity.
+	 * @param <T> The type of the entity.
+	 */
 	public static class EntityConfig<T extends Entity> {
 		protected EntityType<T> type;
 		protected BiFunction<MaterialManager, T, EntityInstance<? super T>> instanceFactory;
@@ -148,28 +258,46 @@ public class InstancedRenderRegistry {
 			this.type = type;
 		}
 
+		/**
+		 * Sets the instance factory for the entity.
+		 * @param instanceFactory The instance factory.
+		 * @return {@code this}
+		 */
 		public EntityConfig<T> factory(BiFunction<MaterialManager, T, EntityInstance<? super T>> instanceFactory) {
 			this.instanceFactory = instanceFactory;
 			return this;
 		}
 
+		/**
+		 * Sets a predicate to determine whether to skip rendering an entity.
+		 * @param skipRender The predicate.
+		 * @return {@code this}
+		 */
 		public EntityConfig<T> skipRender(Predicate<T> skipRender) {
 			this.skipRender = skipRender;
 			return this;
 		}
 
+		/**
+		 * Sets a predicate to always skip rendering for entities of this type.
+		 * @return {@code this}
+		 */
 		public EntityConfig<T> alwaysSkipRender() {
 			this.skipRender = entity -> true;
 			return this;
 		}
 
+		/**
+		 * Constructs the entity instancing controller, and sets it for the entity type.
+		 * @return The entity instancing controller.
+		 */
 		public SimpleEntityInstancingController<T> apply() {
 			Objects.requireNonNull(instanceFactory, "Instance factory cannot be null!");
 			if (skipRender == null) {
 				skipRender = entity -> false;
 			}
 			SimpleEntityInstancingController<T> controller = new SimpleEntityInstancingController<>(instanceFactory, skipRender);
-			setEntityController(type, controller);
+			setController(type, controller);
 			return controller;
 		}
 	}
diff --git a/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityInstancingController.java b/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityInstancingController.java
index d2af7e459..23bf0b318 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityInstancingController.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityInstancingController.java
@@ -4,8 +4,23 @@ import com.jozufozu.flywheel.api.MaterialManager;
 
 import net.minecraft.world.level.block.entity.BlockEntity;
 
+/**
+ * An instancing controller that will be keyed to a block entity type.
+ * @param <T> The type of block entity this controller is for.
+ */
 public interface BlockEntityInstancingController<T extends BlockEntity> {
+	/**
+	 * Given a block entity and a material manager, constructs an instance for the block entity.
+	 * @param materialManager The material manager to use.
+	 * @param blockEntity The block entity to construct an instance for.
+	 * @return The instance.
+	 */
 	BlockEntityInstance<? super T> createInstance(MaterialManager materialManager, T blockEntity);
 
+	/**
+	 * Checks if the given block entity should not be rendered normally.
+	 * @param blockEntity The block entity to check.
+	 * @return {@code true} if the block entity should not be rendered normally, {@code false} if it should.
+	 */
 	boolean shouldSkipRender(T blockEntity);
 }
diff --git a/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityTypeExtension.java b/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityTypeExtension.java
index e21f03334..3ac1bbb7e 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityTypeExtension.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityTypeExtension.java
@@ -1,9 +1,12 @@
 package com.jozufozu.flywheel.backend.instancing.blockentity;
 
+import javax.annotation.Nullable;
+
 import net.minecraft.world.level.block.entity.BlockEntity;
 
 public interface BlockEntityTypeExtension<T extends BlockEntity> {
+	@Nullable
 	BlockEntityInstancingController<? super T> flywheel$getInstancingController();
 
-	void flywheel$setInstancingController(BlockEntityInstancingController<? super T> instancingController);
+	void flywheel$setInstancingController(@Nullable BlockEntityInstancingController<? super T> instancingController);
 }
diff --git a/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityInstancingController.java b/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityInstancingController.java
index c835ca59e..740800f6b 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityInstancingController.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityInstancingController.java
@@ -4,8 +4,23 @@ import com.jozufozu.flywheel.api.MaterialManager;
 
 import net.minecraft.world.entity.Entity;
 
+/**
+ * An instancing controller that will be keyed to an entity type.
+ * @param <T> The entity type.
+ */
 public interface EntityInstancingController<T extends Entity> {
+	/**
+	 * Given an entity and a material manager, constructs an instance for the entity.
+	 * @param materialManager The material manager to use.
+	 * @param entity The entity to construct an instance for.
+	 * @return The instance.
+	 */
 	EntityInstance<? super T> createInstance(MaterialManager materialManager, T entity);
 
+	/**
+	 * Checks if the given entity should not render normally.
+	 * @param entity The entity to check.
+	 * @return {@code true} if the entity should not render normally, {@code false} if it should.
+	 */
 	boolean shouldSkipRender(T entity);
 }
diff --git a/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityTypeExtension.java b/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityTypeExtension.java
index cede41bbe..b01918acd 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityTypeExtension.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/instancing/entity/EntityTypeExtension.java
@@ -1,9 +1,12 @@
 package com.jozufozu.flywheel.backend.instancing.entity;
 
+import javax.annotation.Nullable;
+
 import net.minecraft.world.entity.Entity;
 
 public interface EntityTypeExtension<T extends Entity> {
+	@Nullable
 	EntityInstancingController<? super T> flywheel$getInstancingController();
 
-	void flywheel$setInstancingController(EntityInstancingController<? super T> instancingController);
+	void flywheel$setInstancingController(@Nullable EntityInstancingController<? super T> instancingController);
 }
diff --git a/src/main/java/com/jozufozu/flywheel/mixin/BlockEntityTypeMixin.java b/src/main/java/com/jozufozu/flywheel/mixin/BlockEntityTypeMixin.java
index c9f086957..ba5b86e18 100644
--- a/src/main/java/com/jozufozu/flywheel/mixin/BlockEntityTypeMixin.java
+++ b/src/main/java/com/jozufozu/flywheel/mixin/BlockEntityTypeMixin.java
@@ -1,5 +1,7 @@
 package com.jozufozu.flywheel.mixin;
 
+import javax.annotation.Nullable;
+
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Unique;
 
@@ -15,12 +17,13 @@ public class BlockEntityTypeMixin<T extends BlockEntity> implements BlockEntityT
 	private BlockEntityInstancingController<? super T> flywheel$instancingController;
 
 	@Override
+	@Nullable
 	public BlockEntityInstancingController<? super T> flywheel$getInstancingController() {
 		return flywheel$instancingController;
 	}
 
 	@Override
-	public void flywheel$setInstancingController(BlockEntityInstancingController<? super T> instancingController) {
+	public void flywheel$setInstancingController(@Nullable BlockEntityInstancingController<? super T> instancingController) {
 		this.flywheel$instancingController = instancingController;
 	}
 }
diff --git a/src/main/java/com/jozufozu/flywheel/mixin/EntityTypeMixin.java b/src/main/java/com/jozufozu/flywheel/mixin/EntityTypeMixin.java
index 828232c4a..fdd14c9d2 100644
--- a/src/main/java/com/jozufozu/flywheel/mixin/EntityTypeMixin.java
+++ b/src/main/java/com/jozufozu/flywheel/mixin/EntityTypeMixin.java
@@ -1,5 +1,7 @@
 package com.jozufozu.flywheel.mixin;
 
+import javax.annotation.Nullable;
+
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Unique;
 
@@ -15,12 +17,13 @@ public class EntityTypeMixin<T extends Entity> implements EntityTypeExtension<T>
 	private EntityInstancingController<? super T> flywheel$instancingController;
 
 	@Override
+	@Nullable
 	public EntityInstancingController<? super T> flywheel$getInstancingController() {
 		return flywheel$instancingController;
 	}
 
 	@Override
-	public void flywheel$setInstancingController(EntityInstancingController<? super T> instancingController) {
+	public void flywheel$setInstancingController(@Nullable EntityInstancingController<? super T> instancingController) {
 		this.flywheel$instancingController = instancingController;
 	}
 }