"Alain" <aze### [at] qwertyorg> schreef in bericht 
news:4b0a0bde@news.povray.org...
> You scale the rings by 10 000. That means that there is 10 000 times more 
> media. The thickness of the ring goes from 0.002 to 20. Then, with your 
> very oblique view, you probably travel at least 5 times longer through the 
> media. This may explain, toggether with your emissive media, why you get 
> that saturated white ring.

In other words, and as a general rule of thumb, always divide your 
scattering media by the *same amount* (or the same vector) with which you 
scaled the object containing the media. You can fine tune around that of 
course.

Thomas

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