David Burnett wrote:
> 
> [...]
> 
> All this came from a uv_mapped 2D pigment function that I wanted to try
> using as iso_function to 'displace' a sphere, to give that extra inch of
> realism over using it as a normal function.

This has nothing to do with what i mentioned.  You can't use uv-mapping
for a displacement function since UV coordinates are only available on the
surface (i.e. in textures).  You could generalize that to uvw-coordinates
but that would require elementary changes and would only work for certain
very basic objects.

Using angular coordinates for displacing the surface of a sphere is no
problem with the current function syntax.

Christoph

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