Any software/program/code for ray-tracing?

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Nonthanan Sitpathom

I have seen some people used POV ray program for analyzing the distribution of light.

http://www.povray.org/download/

Naveed ur Rehman

Just found PVTrace!

https://github.com/danieljfarrell/pvtrace

Luis Miguel Gaspar Venancio

More recent is opticspy, a Python module for ray tracing. Seems promising.