BlockEntityWithoutLevelRenderer

BlockEntityWithoutLevelRenderer is a method to handle dynamic rendering on items. This system is much simpler than the old ItemStack system, which required a BlockEntity, and did not allow access to the ItemStack.

Using BlockEntityWithoutLevelRenderer

BlockEntityWithoutLevelRenderer allows you to render your item using public void renderByItem(ItemStack itemStack, TransformType transformType, PoseStack poseStack, MultiBufferSource bufferSource, int combinedLight, int combinedOverlay).

In order to use an BEWLR, the Item must first satisfy the condition that its model returns true for BakedModel#isCustomRenderer. If it does not have one, it will use the default ItemRenderer#getBlockEntityRenderer. Once that returns true, the Item’s BEWLR will be accessed for rendering.

To set the BEWLR for an Item, an anonymous instance of IClientItemExtensions must be consumed within Item#initializeClient. Within the anonymous instance, IClientItemExtensions#getCustomRenderer should be overridden to return the instance of your BEWLR:

// In your item class
@Override
public void initializeClient(Consumer<IClientItemExtensions> consumer) {
  consumer.accept(new IClientItemExtensions() {

    @Override
    public BlockEntityWithoutLevelRenderer getCustomRenderer() {
      return myBEWLRInstance;
    }
  });
}

That is it, no additional setup is necessary to use a BEWLR.