In a prt : if I want to define the intersection of 2 surfaces, I can't  use the Intersection curve , if 2 extrusion  surface, for instance

I have then to set a collection of points, define relations to stick  them on every surface, and define a spline to joint them. Just that a  spline is an approximation, except if I define a lot of points.

Is there another way to define such intersection ?

Btw, the intersection curve is hidden in the sketch tools - another  occurence in the Curves Tool Bar would be welcome.

And tx for any help