Alain <aze### [at] qwertyorg> wrote:

> > clipka<ano### [at] anonymousorg>  wrote:
> >> Am 11.02.2011 09:43, schrieb Bruno Cabasson:
> >>> Lots of photons here ....
> >>
> >> High dispersion count, too, I guess...
> >>
> >> Looks awesome!
> >
> >
> > ior = 1.5
> > dispersion = 1.1
> > dispersion_count = 768
> > gather_min = 128
> > gather_max = 512
> >
> > 127+ million photons (highly diluted far from lenses...)
> >
> > I could not get rid of the interference fringes, probably due to spiral pattern
> > of the shooting. The solution could consist in making them sub-pixel, but this
> > means also lower resolution for a smooth result, or even more photons! Another
> > shooting method could avoid these fringes.
> >
> > The actual diameter of the incoming beam (cylindrical light_source) is smaller
> > than the one rendered, and corresponds roughly to the center part of it. Due to
> > gathering?
> >
> > Render time: about 8 hours on a dual Xeon 3Ghz. I had to mask the prism side
> > pointing to the camera, otherwise, rays get lost forever inside the prism.
> >
> > Bruno.
> >
> >
>
> Any jitter for the photons? It can greatly help getting rid of those
> "interference fringes".
> Another thing that can help is to use more samples for your media. Here
> also, jittering can help somewhat.
>
>
> Alain

I tried! But the result was always more or less splotchy. The only way I found
to get a smooth result is to use no jitter. It reduces the number of photons,
but the jitter pattern appears, mainly in highly diluted areas... It is just an
experiment.

Bruno

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