PenetrationLocator

• A PenetrationLocator provides the perpendicular distance from a Secondary node to a Primary side and the "contact point" on the Primary side.

• The distance returned is negative if penetration hasn't yet occurred and positive if it has.

• To get a NearestNodeLocator #include "PenetrationLocator.h" and call getPenetrationLocator(primary_id, secondary_id) to create the object.

• The algorithm in PenetrationLocator utilizes a NearestNodeLocator so patch_size is still important.