Tangibility radius

The Tangibility Radius of an object is a property of the object that determines when it will be tangible (i.e. able to be collided or interacted with). When Mario's distance to the object is less than the tangibility radius (i.e. he's "in" the tangibility radius), the object will be tangible; when he's outside of the tangibility radius, it will be intangible. Tangibility radii were implemented for efficiency; it's pointless for the game to waste time on checking the collision of an object with, for example, Mario, when it's so far away from him that he can't possibly be interacting with it.