NEWS: now gnu-ized, get it from:
http://sourceforge.net/projects/rayshade/
Rayshade is a 1990's raytracer, a great one back then. It has value in support of existing software and raytrace scene files, which ranges from legacy files to existing CAD software that can export 3D scenes Rayshade can build a scene for.
Files Section has a patch allowing Rayshade to build in Linux more fully / less errors than the tiny redhat patch that can be found.
The Utah Raster Toolkit...