What Software Can Simulate Light Reflection for a Solar Heliostat Project?

[Nuke STEEL]

Does anyone Know a program that can simulate light reflection in a 3d environment, to help me in my project "Solar Heliostat". I want the program to determine the angle of reflection and the size of the beam of light on the desired target.

 

[0xDEADBEEF]

Here you go http://www.lambdares.com/software_products/oslo/

I think there are alternatives, but I don't remember them