Am 05.12.2013 17:18, schrieb jceddy:

> I noticed that in this particular scene, the caustics created by the photons
> when I have photon mapping and dispersion turned on create these concentric
> rings...this only seems to happen when the light source is parallel with the
> center of the glass sphere...if I move it up a little I get a focuses circle
> caustic.
>
> I'm guessing this this is due to the photons reflecting around the inside of the
> sphere, but am wondering if the effect is realistic or if it should be
> considered an artifact? I actually looked for photos with a similar effect, but
> haven't yet found one.

This is definitely an artifact.

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