"Trevor G Quayle" <Tin### [at] hotmailcom> wrote in message
news:web.44e2341471ada471c150d4c10@news.povray.org...
>
> Not sure how familiar you are with heightfields.  Typically they use an
> external image, however, POVRay allows them to use internal images as
well.
>  This includes definable pigment patterns as well as functions. The basics
> steps are as follows (note that heigtfields evaluate the pattern functions
> on the x-y plane from <0,0,0> to <1,1,0> and are created on the x-z plane
> from <0,0,0> to <1,0,1>):
>

Thanks, very much appreciated.

I use height fields often but usually with images. I haven't played much
with the pigment pattern

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