"Kevin Loney" <klo### [at] pt2mcom> wrote in news:3e94b3a3@news.povray.org:

> I considered using trace(), but then decided against it because of the
> fact each vertex is only an approximation of the iso and will not
> neccesarily be right where it's supposed to be. By using trace() the
> normal approximation could be off by a lot resulting in a really
> strange shading. I would use the average of the neighboring faces but
> since I'm not storing them that could cause just a bit of a problem.
> I've been looking into ways of approximating it based on the function
> supplied, I think I have an idea of how to do this, but I'm not sure
> yet, but thanks for the suggestions. 


The vGradient() macro should be able to do the job.

Here's the documentation for it:

http://www.povray.org/documentation/view/253/


Tor Olav

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