From intersection to tangency by galapagos

Hello to everybody,

I'm new in Galapagos, so I need your help!

Well, my problem is that:

I've a tube. Random line cross the tube creating several intersections points.

I want to obtain a point of tangency on the tube's surface, for each line, or by changing the coordinates of the starting point or the ending point of the line.

thank's to everybody

Marco

Ps: the green line in the screenshot is the target, but it's not made by galapagos