You can use this tool to create a closed 3D polygon based on a closed sketch on any surface. If you press the CTRL key in addition to the ALT key, the system tries to create a circle or polygon parallel to the coordinate planes.
To create a polyline
To create a circular polyline or a polyline parallel to the coordinate planes, press and hold down the ALT and CTRL keys and draw the outline of the surface using the mouse.
The outline is displayed in blue.
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