BMRT is a true raytrace/radiosity renderer, although it also adheres to the
Renderman language standard. I am not sure, but I believe BMRT and Renderman
convert NURBS to triangle meshes internally (after all, POV does this with
bezier patches, too)

Margus

Nieminen Mika wrote:
> 
>   I have absolutely no idea about the mathematics involved in NURBS
> calculation, but I can speculate and say that those renderers which use
> real NURBS (bmrt, renderman) are not raytracers while povray is. Maybe
> calculating the intersection of a ray and a NURBS is not easy and/or fast?
> I don't know...
>   (Note: Maybe I'm wrong with bmrt, but AFAIK renderman is not a raytracer)
> 
> --
> main(i){char*_="BdsyFBThhHFBThhHFRz]NFTITQF|DJIFHQhhF";while(i=
> *_++)for(;i>1;printf("%s",i-70?i&1?"[]":" ":(i=0,"\n")),i/=2);} /*- Warp. -*/

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