Hello Thomas,

thanks again. May be I read this section some years ago but it did not 
came into my mind. The only problem was, that it led me to a wrong track 
regarding the container issues with the steam fog approximation. I will 
not use an emitting media as sun but will follow an approach by Johannes 
Eriksson (May-June competition of the IRTC in 2006). But this is a 
legacy scene and the conversion is not as simple as I expected.

Best regards
Michael

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