Use the following options to set what happens when you select Modify > Convert > Polygon Edges to Curve.
Form
Sets the type of curve that results once the selected edges are converted.
- Open
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Creates a curve with disconnected start and end points.
- Periodic
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Creates a curve with connected start and end points. If the selected edges do not form a closed loop, Maya will automatically connect the two open endpoints.
- Best Guess
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Creates a periodic curve if the selected edges form a closed loop. Creates an open curve otherwise.
- Conform to Smooth Mesh Preview
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Causes the curve to follow the smoothed preview of a mesh rather than the base cage mesh. You can toggle the various Smooth Mesh Preview modes (hotkeys 1, 2, 3) to see the curve in various smooth forms.
- Degree
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The higher the Curve Degree, the more control you have over the curve’s smoothness. The default setting (3 Cubic) works well for most curves.