In article <Xns### [at] 204213191226>,
 "Rafal 'Raf256' Maj" <raf### [at] raf256com> wrote:

> there must be function (isosurface) for bicubic path, what is the expresion 
> for it ?

A bicubic patch is a parametric shape, not an isosurface. You could come 
up with a function to describe some cases, but clipping it to the right 
shape would be a huge pain and you wouldn't be able to do it for all 
cases (a self intersecting patch, for example). It would be much easier 
with the parametric primitive, but still much more of a pain than simply 
using the internal primitive. And if you are going to do either of 
these, why limit yourself to a bicubic patch?

It sounds like the problem here is simply with the parameters to the 
bicubic patch. I'm not familiar enough with using that shape to be of 
any help though...

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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