The easiest way to do that depends a bit upon the exact geometry of your 
squares. So you should precise a bit.

Until some specialist answers you, I can give some tracks:
- You can combine a radial and gradient textures.
- You can use UV mapping I think, but I don't know much on how to use it.
- You can generate your sphere as a mesh and assign the proper texture 
to each triangle.

I would go with the first one, it is probably the easiest and more 
efficient solution. Let me know if you need more clues,

JC

Miguel Garcia wrote:
> I would like to make with POV a non-traditional spherical chess board. I
> already have the 1-parametric description of the lines that play the role of
> sides of the squares. The intersections of such lines are the corners of the
> squares, for which I would like to use two different patterns, of course.
> 
> I have some idea about how to do it, but does not seem very practical. Any
> suggestions?
> 
> 
> Thanks in advance.
> 
> 
> --


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