Povray

The Persistence of Vision Ray-Tracer creates three-dimensional,
photo-realistic images using a rendering technique called
ray-tracing. It reads in a text file containing information
describing the objects and lighting in a scene and generates
an image of that scene from the view point of a camera also
described in the text file. Ray-tracing is not a fast process
by any means, but it produces very high quality images with
realistic reflections, shading, perspective and other effects.