FilterVisiblePaths() filters the visible paths and returns them in oPathListOut.

IsPathVisible() checks if a Paths is visible (and thus maximal intersecting a face at its start or its end point).

IsLineIntersectingFace() checks if a finite line intersects a face and returns the enum EIntersecting.

IsPointInFace() checks if point is in a (also) not convex face using the Jordan method.

The enum EIntersecting can be one of four cases: NOINTERSECTION, ATSTART, ATEND and BETWEEN.