Convert Arc to 3dPoly

Converts a single arc to a 3D polyline with interpolated elevations along the polyline. This can be very useful in spiral staircases, 3D transitioning surfaces, and road designs.

Keyboard Command: CnvArc3dp

Procedure:

1. Select a single arc to convert.
2. Enter the acceptable middle ordinate value to use in creating the newly created 3D polyline, the smaller the value, the the smoother the curve.
3. Enter the elevation at the first point on the arc, or press P to pick a point with the desired elevation. A temporary marker will be placed to show which end.
4. Enter/Pick the elevation at the second point on the arc.
5. Designate whether to reverse the XY direction of the 3D polyline, causing it to travel from the second point back to the first.
6. Designate if you would like the 3D polyline splined. If adequate segments are created, and the 3D polyline is splined, it creates a well formed 3D polyline, even splined in the 'Z' direction.