Attached Link: http://www.splutterfish.com/sf/gallery_view.php?photo_id=231&screen=8&cat_id=2&action=images

I should point out also, that standard scanline rendering and raytracing work "backwards" from the camera: the rays start at the camera, and only the rays from the camera are bent or bounced by raytracing. Renderers like Brazil and Vray (and Mental Ray as well) calculate photons of light starting at a light source (like real light), which can be reflected, refracted, bounced off mirrors, or concentrated by a lens, accurately simulating more of the ways real light can move through a scene. Otherwise known as caustics. Standard scanline renderers aren't capable of doing real caustics, and must resort to tinting shadows to "fake" the result. However, these renderers combine raytracing and photon mapping to calculate light bounced off mirrors onto walls, etc.