Vincent:
I am going to try both options. And see where that brings me. For a hothouse 
the media solution would be impractical I think. I am working on a 
geodesic-like dome with very many panes.

Bill:
double illumination is something I shall try, as also suggested by Vincent. 
I already discovered (with the frosted glass I came up with first) that high 
quality radiosity is essential indeed.

Thanks a lot, both of you!

Thomas

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