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I don't particularly like the background patterns supplied with
POV-Ray. (Well, the bw marble one is quite nice.) So I decided to
make my own, using... well... POV-Ray! The trick is, how do you get
the pattern to loop? The best I can come up with is something like...

camera
{
  spherical
  angle 360, 360
  location <0, 0, 0>
  direction z
  up y
  right x
}

object
{
  sphere {<0, 0, 0>, 200}
  hollow
  texture
  {
    pigment {...}
    finish {ambient 1 diffuse 0}
  }
}

If you render that as a square image (e.g., 100x100 pixels) it loops
quite nicely... The image is a bit distorted though. The other
possibility is to use

camera
{
  ultra_wide_angle
  angle 360
  location <0, 0, 0>
  direction z
  up y
  right x
}

But that has other distortions too. (I like the first one better!)
Can anyone think of more creating ways of going about this? Perhaps
something weird could be done using function pigments and an
orthographic camera?

Thanks.
Andrew.

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