Daniel Schwen wrote:
> 
> Hello,
> I hope this qualifies as advanced.
> To calculate a CGH (computergenerated hologram) I need to create a
> pattern which consists of the sum of several translated onion patterns
> squared. How can I accomplish this? Layered textures obviously won't do
> the trick.
> Using an Isosurface function as the pattern would be perfect. Does that
> work, and if so how?
> Cheers,
> Daniel

Daniel,
one possibility would be to use my POV-Ray patch POVMan, which allows to
use RenderMan Shading Language for defining pigments. With this you can
create onion shader and use it as pigment in POV-Ray scene. I've made
small test with onion pattern, if you're interested, then drop me a note
and I'll post them in my homepage or send by email.
POVMan homepage:
http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2

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