Bret Slivka wrote:
> 
> Hello group.
> 
> I'm working on a 3d model of the planet Earth. I am trying to figure out
> how to take this elevation map, turn it into a heightfield and somehow
> "wrap" this heightfield around a sphere. but i'm a little stumped, so I
> thought I'd tap into the vast knowledge of this collective for guidance.

Features on the surface are under 10 km.  Yet the equator-to-
pole distance is 10 Mm --- 1000 to one.  Therefore for any
real purpose the Earth is smooth -- use textures
instead if you want anything approaching realism.

But this avoids the point...

POV doesn't support general surface extrusions, and mapping of
height fields is a form of surface extrusion.  Or similary,
it doesn't support superlinear transformations, and spherical
mapping is superlinear.  So I don't think there is an easy
answer.

Dan

-- 
http://www.flash.net/~djconnel/

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