Please help if you can.

My problem to solve is put simply i need to work out reflective property of a cut gem stone in a 3D image.



For example in the case of the above image I need to be able to see where does a ray of light travels/path of the ray of light and be able to manipulate facets/design of the gem stone to see the reaction of it.

Please help if you can.

N.B. I do not know much about 3D imaging. :-[

just   use  raytrace  in   material/map   browser.    you    
should   try    it.

perhaps using a render plugin like final render or mental ray to create causics....