Flange surfaces are composed successively from ruled surfaces. A
flange surface can start from the guide curve or from a target
surface. Length and Angle define extent and direction of the flange
surface. The basic flange direction is the direction with a flange
angle of 0 deg.
The order of the flange surface in direction of the guide curve will be adopted from the guide curve. The order perpendicular to the guide curve will always be 2. The guide curve
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