> But as ASTER DEMs are 3601 by 3601 data points per square degree and
> probably noone of us is able to handle one single giant DEM of the
> entire Earth at this resolution, I now would like to know whether it is
> possible to constrain the DEM (with my script: heightfield) pigment
> function to a certain range of geographical coordinate (with the Tristan


Just a guess, and I don't know how to do it, but the contained_by{} code 
of the isosurface seems indicated. Probably a box with the geographical 
coordinates transposed into xz coordinates and y determined by your 
intended height?

Thomas

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