Creates a NURBS curve in the form of a planar circle.
When this option is turned on (check mark) the circles are closed curves, with the first and last span overlapping. (The result corresponds to the circle primitives created in previous versions of the software.)
When this option is turned off (no check mark), the circles are open curves, with only the first and last CV touching. They can be opened by moving those CVs apart. They also use an algorithm that produces better quality circles and the ability to specify a range of degrees (see the following options).
The following options only appear when Periodic is turned on.
The degree of the NURBS curve, either 1 (polygonal) or 3 (cubic).
The number of subdivisions (spans) on the curve.
The default is 8. A workable primitive shape usually has at least 4 subdivisions. It is not usually necessary to use more than 20 subdivisions.
The following options only appear when Periodic is turned off.
The degrees of rotation around the center of the circle.
For example, if you enter 180 degrees, Alias creates a half circle.
Specifies the degree of the circle. The values range from 2 to 7. The default is 5.
Specifies the number of spans in the circle. The values range from 1 to 14. The default is 1.
, the Arc Spans option
is not available.
