Christian Froeschlin wrote:

> Rerendered at 800x600 with slightly improved lighting.
> 
> Sorry for starting a new thread but Thunderbird insisted on
> sorting my original "Rainbow" post into a thread from 2008
> using the same title.
> 
> While testing I also had the curious effect that I got additional
> caustics from the glass when *removing* the window pane. I really don't
> quite understand how this can affect anything, the window pane uses
> photons {pass_through refraction off reflection off collect off}.
> The water glass is the only photon target in the scene.

I've had something similar with photons, blobs, and a certain level of
transmit on the textures on the blobs. Pov'd go into an infinite loop while
casting photons or render a completely black scene. Somebody on here said
it was a known bug?

Maybe you are seeing a manifestation of it. As far as I know this is not
fixed in 3.7 beta either.
-- 
Stefan Viljoen

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