Hi Pilou,

> If the start object don't touch the surface, the end object on the
> target surface don't touch it also
> Am i right?

Yup, that's correct - the same distance of the start object to the base object will be applied to the target surface.

It's related to surface offsetting really - basically the distance of the starting object to the base surface becomes an offset distance that is used to make a point on an offset surface of the target surface.

- Michael