Thanks a lot for all of you,

The problem is solved!

In fact, it was really a problem with coincidence surfaces.
my first tests were done with only about 5000 triangles, and with both 
version:

- surface of wine is in contact with glass
- surface of wine is offset by amout 0.1 mm

The second test vino3.jpg with more triangles had still a surface of 
wine in contact with the glass.
So I have now add a gap again between glass and wine and it gives very 
good results.
I also play with some parameters in my CAD programs, so I only need 
about 8000 triangles.

I only have a PII, and it takes always a lot of time to realise such 
rendering, it is a nightmare, specially in the test phase.
I hope I will send you a nice picture in some weeks, in fact I wanted to 
render a broken glass, and to see some interesting caustics effects.

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