/**
  * Calculates distance between plane and a point.
  *
  * @param P The other point.
  * @return >0: point is in front of the plane, <0: behind, =0: on the plane.
  */
 FORCEINLINE float FPlane::PlaneDot(const FVector &P) const
 {
 	return X * P.X + Y * P.Y + Z * P.Z - W;
 }