MinecraftForge/MinecraftForge — pull request #67 by ScottKillen (2012-06-01 06:17:10+00:00)
Title: Tree/Leaf Registry

Added Tree/Leaf registry

This allows vanilla logs to sustain custom leaf blocks. Also allows WorldGens to replace custom leaves.
In addition, allows non-opaque blocks to be registered as impervious to leaves, so that leaves will not replace them on tree growth.

Crude showcase mod at http://www.mediafire.com/?gml789eyboyn057

Illustrated custom leaf blocks that decay when vanilla logs are removed and glass towers that leaves grow around instead of through.