Sputnik wrote:
> There are many strange artifacts in your image -- see attached image

Thanks. Yes, you're right. These are caused by calculating radiosity in a 90
degrees camera angle, and rendering the final image with a 45 degrees angle.
Higher settings for radiosity would look nicer, but I found another solution
as Mark Weyer pointed me to: interior_texture.

Sputnik wrote:
> I don't think they are caused by multiple light sources at the
> ceiling (or do they vanish when only one light source is used?)

No, multiple light sources at the ceiling makes the photons look bad. Each
of these lights will make a bright photon-spot below the glass sphere, but
at slightly different positions. The result looks splotchy. Using only 1
light gives smooth caustics.

With all these parameters carefully adjusted, the 3 passes takes about 35
minutes to render. That's a lot quicker than joining everything in 1 pass.
WinOSi, on the other hand, need about 8 hours to make a similar, smooth
image (nearly free from noise). I checked it tonight. But there are some
advantages of WinOSi.. In short, it's more accurate.

Regards,
Hugo

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