Alastair Murray wrote:
> 
> What I need is to know the y coordinate of any particular <x,z> coordinate
> of a height_field.
> 
> I thought this could maybe be done with the Trace macro but I think this is
> only for spheres.

Which leads to the question why you think 'trace()' is a macro and why it
should only work on spheres...

See: http://www.povray.org/working-docs/id000139.html#6_1_4_6

Christoph

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