MinecraftForge/MinecraftForge — pull request #180 by ScottKillen (2012-09-22 15:43:55+00:00)
Title: Allow block to determine whether the renderer should apply stair and half slab lighting fixes to it

This allows modded half slabs and stairs and their shadows to be rendered properly without having to decrease lightOpacity for the block.

Currently the only solution is to write a custom renderer to eliminate shadows on the block itself and to set the blocks LightOpacity to 0 to prevent shadows on adjacent blocks. *Side effect of this is that light shines through custom slabs and stairs...*