Mike Williams <nos### [at] econymdemoncouk> wrote:

> #declare P =   pigment { function{F(x,0,z)}...

> isosurface {
>   function {y-F(x,0,z)*2}...


Thanks, Mike.  This turned out to solve my problem.  I kept trying to include
the 'y-' in my pigment definition, which is silly.  Clearly, a misconception on
my part.

Much appreciated!

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