Thanks to all for your answers.
I will look at tha one click product you mentionned, and see if they fit my requirements (in fact, I'm looking for a photorealistic result) and also I tried to find the VSS thread, but I was unable to find the begining or any download link. So if you could help with a link?
I understand it could seems lazy, but it always a question of time available...
Thank you again for your help
Qasar