We describe a new technique for 3D positioning, based on the typical sliding technique. We assume that by default object stay in contact with the scene's front surfaces and do not interpenetrate other objects. To ensure precision, we permit manipulation only for at least partially visible objects. With our new FLOAT-Sliding method the user can override the default contact assumption and lift objects into the air or make them collide with other objects. For efficiency, FLOAT-Sliding uses frame buffer techniques.