In article <3B16A91A.54D12A9A@gmx.de>,
 Christoph Hormann <chr### [at] gmxde> wrote:

> A reasonable tesselation of a sphere is quite a difficult thing IMO. 
> Enough triangles that no corners are visible with the current camera
> position and angle and not to much that it does not need too much memory.

I don't think it's that bad...no more so than any other curved surface. 
Recursively subdividing the sides of a tetrahedron or octahedron seems 
to perform pretty well. You don't have as much control over the 
resolution, but the triangles are fairly even in size. Add in smoothing 
of normals, and there isn't much of a problem.


> Newly generating the mesh with every change of viewpoint, ...

Why? The viewpoint doesn't affect the geometry of the scene...

-- 
Christopher James Huff - chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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