code: @SideOnly(Side.CLIENT)
  	public static CallbackResult<Boolean> processRenderBlockCallbacks(BufferBuilder buffer, IBlockAccess world, BlockPos pos, IBlockState state)
  	{
  		//warning mutable BlockPos received
  		return renderBlockRegistry.processCallbacks(buffer, world, pos, state);
  	}
docs: Processes {@link IRenderBlockCallback IRenderBlockCallbacks}.<br>
  Called by ASM from
  {@link BlockRendererDispatcher#renderBlock(IBlockState, BlockPos, IBlockAccess, net.minecraft.client.renderer.BufferBuilder)}
  
  @param buffer the buffer
  @param world the world
  @param pos the pos
  @param state the state
  @return the callback result