Geometry Tools - Intersection

You can select edge or face to calculate the intersection point or curve.

To open Intersection:

In the dialog , select the type you want to intersect:

a. Preview of intersecting.
b. Intersecting results

There also provides two options: Relax Tolerance and Untrim Mode. When Relax Tolerance is checked, two unintersected shapes but locate very close can get the intersection. If Untrim Mode is checked, all selected shapes will be untrimmed firstly, and try to get intersection using the untrimmed curve, surface.