forked from: Ken Silverman's GROUFST2 Terrain Raycaster

GROUFST2.KC ported from GROUFST2.BAS by Ken Silverman (09/28/2006)
GROUFST2.KC ported to AS3 by Bruce Jawn (January/4/2011)
http://bruce-lab.blogspot.com

Original source code can be found at Ken's website:
Qbasic: http://www.advsys.net/ken/voxlap.htm (GROUFST2.BAS)
EVALDRAW: http://www.advsys.net/ken/download.htm (evaldraw.zip\demos\groufst2b.kc)

Happy Coding 2011!