1。 Perpendicular movements can be executed by using the Shift key.
2。 With Ctrl key movements are fixed to the selected direction within the plane.
3。 Especially in Normal mode each control point moves "normal" to the surface.
4 Using left and middle mouse button at the same time freezes future movements to the currently selected cursor direction.
This mode is switched OFF in the same way. ents to the currently selected cursor direction. This mode is switched OFF in the same way.