Hi(gh)!

The problem: I want to project a square image_map, which is a 
heightfield covering one square degree of ASTER elevation data, onto a 
sphere, not onto the entire sphere, but instead onto the geographic 
coordinate range defined by the elevation data tile.



shall have the texture, all other parts of the sphere shall remain 
textureless.

To avoid misunderstanding: I do not want to create a curved 
"heightfield" (this I already have achieved), but a "geographically" 
constrained pigment function which then will be used for an isosurface.

Is this doable at all with POV-Ray? Obviously, Christoph Hormann must 
have done it with the terrain renderings on his "Imagico" pages: 
http://earth.imagico.de/technical.php

I can't imagine that he used an isosurface covering the entire Earth, as 
billions of height data points would have to be processed, which simply 
would be beyond the capacities of today's PCs...

See you in Khyberspace!

Yadgar

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