andrel wrote:
> Desreux wrote:
> 
>> Being a chemist, I often draw molecules as balls and sticks of various
>> colors. The files containing x,y,z coordinates and information on the
>> colors, size, nature of the atoms and bonds. These files  are 
>> converted in
>> PovRay to obtain quite nice drawings (for instance with a program called
>> Mol2mol but there are many others). Sometimes, I have to produce plots 
>> with
>> a white background and with atoms in different tones of gray. If the
>> molecules contain many different atoms, it's no longer easy to 
>> distinguish
>> them and I would like to add the appropriate chemical symbol on some 
>> of the
>> atoms. The letters would have to follow the curvature of spheres of
>> different sizes and be partly hidden by atoms that are closer to the 
>> viewer
>> if need be. The PovRay files I use give a list of atoms with the
>> characteristics of each of them. I guess I should add something there to
>> get what I want but being quite inexperienced in Povray, I don't know how
>> to proceed. Could someone help me (as I did not find what I was 
>> looking for
>> on the web). Thanks a lot. Jean F.
>>
>>
>>
> An alternative would be to approximate a sphere by a set of bicubic
> patches and use UV mapping. It depends a bit if you only want text
> on it (use another e.g. Mike's approach) or if you want to have
> also symbols or bands of color or ... on it.
Actually, no, that is too complicated. You can simply put a image_map
on a sphere.

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