I don't know yet if this one is easy but it's a prog made by an alone crazy guy Steven Glanville like Michael :)
Art : the new ray tracer of Anim8or (yesterday :)
http://www.anim8or.com/download/preview/art_raytracer.html
Anim8Or permit to reload OBJ, 3DS, LWO format
http://www.anim8or.com
It's also a stand alone that makes the same than 3Dmax : modeling, animation, render :)
Particularity : all is 900 kb compressed :)
A true gem ! Rustic but efficient!
PS It's free!
Just a speedy test with a Bump image mine http://forums.polyloop.net/imagehosting/196469411f9e5d79.jpg
Model By Manz