Lance Birch wrote:
> 
> Well, it depends what you're doing.
> 
> This issue has come up a few times in regard to POV-Ray and it seems there
> is the same problem.  POV-Ray isn't a modeller, and modellers are needed to
> make NURBS surfaces.  

The same could be said about bicubic patches, and all we need is tools
to generate them (SPatch, Moray,...).  Same apply for NURBS.  If they
get implemented, they will work as patches work : subdivided into smooth
triangles before the rendering.

>Making up the keyword description for POV-Ray would be
> near impossible considering the number of specialised surface triming and
> blend functions along with all the point and CV splines.  I personally have
> no idea how it would be possible to make a tokinised description for NURBSs.

The Renderman specifications include NURBS.  RIB files are just text
files,
so it's perfectly possible to have such an implementation in Pov.  BMRT
is
also a-renderer-not-a-modeler and uses NURBS (and much probably
subdivides
them into small triangles before rendering).

Fabien.

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