The curve intersection is a form of sketch created at the intersection of walls, surface, objects with a plane or surface.

The order and method of marking play an important role in the operation. Well, if you turn on the flat sketch on the plane and create an intersection, the resulting sketch will be a 2D sketch.

But if you don't turn on the sketch first, and you will select an identical pair of faces and a plane – as a result of the intersection you will get a 3D sketch!

When it matters?

In situation, if you want to quickly create many sketches on different planes.