Placement ->
Arg X, Y, X : Float

When 0 <= X < 1 && 0 <= Y < 1 && 0 <= Z < 1 then
Return POINT_INSIDE

When 0 <= X < 1 && 0 <= Y < 1 &! 0 <= Z < 1 then
Return POINT_OUTSIDE_Z

...

Else
Exit ERR_PLACEMENT
