pb with GORDON surfaces

 From:  lorem (LOREMBOLO)
1191.8 In reply to 1191.7 
Thx Michael,

I've found severall solutions.
But I would like to use the net/gordon tool for trainig purpose.
I started over from scratch, it works, but with the old file it seems ther is a pb....

I continue exploration....and post soon the different methods used

thx for helping !!