Sets or gets the fade exponent for ISmartPlaceables which exceed the current overlap. Setting the placement fade has no effect on previously placed objects.
Sets or gets the maximum permissible placed overlap expressed as a percentage [0, 1] of each placeable's area. Setting the placement overlap has no effect on previously placed objects.
Place the object with respect to currently placed object. Calling this method causes the object to be immediately updated, but has no effect on previously placed objects. Placeables which cannot be placed within the placement bounds or without overlapping previously placed objects are hidden
