Thank you Ari-Matti for your comments! I am encouraged by all the replies I
got from different people. Also your useful analyse.

You ask about the black sphere in #2. It mainly consists of blurred
reflection and depends very much on the enviroment, as you can imagine. The
enviroment is a HDR light probe (High Dynamic Range image). Radiosity and 3
dim area_lights is used to illuminate the scene. Rendertime: 5 minutes on my
1 ghz AMD. Rendered with ML-POV.

If you want to try this yourself, I attached the .pov file, but you'll also
need these links:

http://martial.rameaux.free.fr/mael/MLPov.html
http://www.debevec.org/%7Edebevec/Probes/

Good luck!
Regards,
Hugo

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Attachments:
Download 'HDR_test1.pov.txt' (3 KB)