node builder library for OpenGL-based Doom-style games

 zdbsp is a node builder specially designed to be used with OpenGL ports of
 the DOOM game engine. It adheres to the "GL-Friendly Nodes" specification,
 which means it adds some new special nodes to a WAD file that makes it very
 easy (and fast!) for an OpenGL DOOM engine to compute the polygons needed
 for drawing the levels.