> 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...
>
>

There is still the isue that, if you don't have an nVidia chip with 
CUDA, it won't work at all...

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