A command-line program that takes a 3D model (like a VRML, X3D or Collada file) and renders an image that would be visible from given camera looking at given scene. Two ray-tracing algorithms may be used: deterministic (classic Whitted-style ray-tracer) and Monte Carlo path tracing.
Complete documentation on http://castle-engine.sourceforge.net/rayhunter.php .
Using Castle Game Engine, see http://castle-engine.sourceforge.net/ .
GNU GPL >= 2.