Simon Adameit wrote:

> Pixar's Renderman uses the reyes algorithm. Afaik its much like
> scanlining but divides the objects into a grid of sub-pixel
> micropolygons which makes detailed displacement mapping possible.
> But due to its nature it cannot render realistic shadows, reflections
> and refractions.

As far as I know the latest PRman release can do both: reyes based rendering 
and reytracing. It uses selective raytracing wich will only be enabled when 
it is needed.

Andreas
-- 
http://www.render-zone.com

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