I figured it out, though with picking the plane i have to subtract/add the picked x/y positiong to put an entity at that location. However heres my code. This places a cone, sphere or cube on a 3d grid, mouse to wander, hit the up/down arrow keys to move to a diff level, and left clicking the mouse drops the object. I was kind of thinking of a making a "super maplet" level editor thingy, shrug if I will.