Bruce Mardle schrieb:

> If I use photon spacing=0.001, the caustics get sharper, as expected, but I also
> get a fairly subtle 'ripple'. It'd be nice to get rid of that, but I can live
> with it. (Curiously, the output is equally ripply with photon spacing=0.002.)

It appears to me that this is your bicubic patch artifacts showing once 
again; in that case I'd expect the "ripples" structure to be quite 
independent of photon spacing, except when the photon spacing is high 
enough to blur it.

Maybe you want to choose a higher photon spacing for the bezier patch 
than for the sphere, using "photons { target 10 ... }" (for instance; 
this will give a 10-fold higher photon spacing than specified in the 
globals section).

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