Directional Smoothing

' Directional smooth ' is a check box just below regular smoothing.  Directional smoothing causes the smoothing effect to be stronger in a particular direction and weaker in the perpendicular direction. Enter the primary smoothing direction in the provided text box. ' Smoothing strength in the primary direction ' allows you to set the influence radius in that direction. ' Smoothing strength in the secondary direction ' controls the influence radius at a 90 degree angle to the primary direction.