PenetrationLocator

• A PenetrationLocator provides the perpendicular distance from a Slave node to a Master side and the "contact point" on the Master 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(master_id, slave_id) to create the object.

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