module Point3d:sig..end
typet =IntAGeom.point3d
val of_point2d : ?z:int -> IntAGeom.point2d -> t
val sq_dist : t -> t -> intval midpoint : t -> t -> t
val rand : t -> t -> tPoint3d.rand a b returns a point with coords
between those of a and bmodule Infix:sig..end