Hi Paolo,

> It's not a real problem,but if you find it i'll be happy

Can you please post a .3dm file with just those 3 cylinder pieces in it that you want to find the shared tangent between?

I'll take a look at it and see if I can make it do that or not.

It really helps a lot if you can post .3dm model files of your objects instead of just screenshots - I can't test directly with a screenshot but I can test directly with a .3dm file.

- Michael