The center of resistance (CR) is the point of concentrated resistance to movement.

When an object is in free space, CR is the center of the object.

CR is the center of the tooth.

If a portion of the object is embedded in something, like a flagpole coming out of the ground, CR changes to the center of the object that is embedded.

From this point on, any object that is designated to be embedded will have CR automatically moved to the correct postition without showing the object actually emedded in another object.