MinecraftForge/MinecraftForge — pull request #141 by ShetiPhian (2012-08-26 09:24:40+00:00)
Title: canCountAsTopBlock

Added block.canCountAsTopBlock which gets checked by world.getTopSolidOrLiquidBlock

Originally done to stop player spawning on a few mod blocks, but seeing how getTopSolidOrLiquidBlock is called from other spots in code it can have other uses.