http://raytracey.blogspot.com/2011/04/kajiyas-scene-from-rendering-equation.html

No polygons there, just spheres.  They recreated in real-time on a GPU the
original scene from Kajiya's paper on the rendering equation and a path tracer.

Even blender got its own fast GPU path tracer these days, though it certainly
uses polygons:

http://blenderartists.org/forum/showthread.php?216113-Brecht-s-easter-egg-surprise-Modernizing-shading-and-rendering

last pages show incredible stuff...

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