Bruce Mardle schrieb:

> Any suggestions on photon settings I could try to make the caustics sharp and
> realistic? Or is it a problem with the Bezier patches?

POV-Ray actually works with a mesh-like pproximations of the patch, not 
with the exact mathematical representation. You can increase the 
resolution of that mesh using the following parameters on the bezier 
patches:

   type     1
   u_steps  3
   v_steps  3
   flatness 0.0

The first parameter tells POV-Ray that you want control over the mesh 
resolution, at the cost of some memory (type 0 would be default).

The second and third parameter tells POV-Ray the (maximum) mesh 
resolution you want. Note that the actual resolution is 2^u_steps by 
2^v_steps. Increase this to reduce the artifacts you observe, or 
decrease for speed.

The fourth parameter tells POV-Ray at which curvature to stop 
subdividing even before reaching the maximum; a value of 0.0 tells 
POV-Ray to always subdivide to maximum. This can speed up things, but 
may introduce other artifacts ("cracks" in the patch).

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