Purpose
Usage
Click the edit twist button to activate it. The contour window will be replaced
by the defcurve window. An axis (purple line) is displayed at x=0
position. A default twist curve is displayed at x=1 position (no twisting).
The points on the twist curve can be moved to twist the Nurbs model along the
spine. First choose the move option in the points menu. The points can be moved by selecting them with the left mouse button and
moving them in the x direction while keeping the middle mouse button pressed.
Moving the points by one unit will twist the model 360 degrees.
Additional points can be added on the twist curve in the points menu.
