[Keyframe]

Also worth noting is PBRT: https://github.com/mmp/pbrt-v2 which is described in a book by Matt Pharr: http://www.pbrt.org/ It's basically a modern textbook on the subject. Or, if you prefer GPU, check out Arauna: http://igad.nhtv.nl/~bikker/

[ldargin]

LuxRender is a pbrt fork.