Modeler
Try POV-Ray. This is the Persistence of Vision raytracer. The
Graphic of the Month or whatever in CS Magazine was done with POV,
and it's a downloadable program. You need to d/load the docs, actual
program, and the scene files. It's quite lenghty, but worth it. It
is a little hard to use, because it's script based. Maybe some
clever programmer will come up with a front-end, eh?