Cool, thanks, sorry I thought my tone was a bit harsh.
Chris Huff wrote:

> It takes a vector. :-)

Doh.

> > B) FUNC_ID NOT LIKED IN EXPRESSIONS.
> > It appears to be an oversight that I can insert these into an isosurface
> > but I cannot "use" these functions as is.
>
> Not an oversight, just not a feature. The isosurface functions were
> originally not intended to be used outside of isosurfaces, they weren't
> made more general until later. I am planning to attempt to implement
> this though...
> In the meantime, you can access them using eval_pattern().

?
How do I declare a pattern?
So far I've tried declaring a function and a pigment but no luck in getting
pov to accept anything yet.  What is a pattern?

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