Thank you very much for your answer. There is new inforamtion here and it explains some of my troubles. I will look into it, try testing and try to make sense of it. If I can´t manage I will come back to you.
I do have another particular question if you don´t mind: About the sign (positive or negative) of the domains, does this have anything to do with the negative indexing of trims in the face commands? How is it established? Because I do see some differences from the domains I get from Rhino, and I can’t quite understand why…
Thanks again, kind regards,
Nacho