Tool Palettes Curves > Arcs > Arc (three point) > Options

Curves > Arcs > Arc (three point)

Allows you to create a keypoint arc by putting down three points the arc must interpolate.

To draw a three-point arc

Click the Arcs > Arc (three point) icon, or choose Arcs > Arc (three point) from the Curves palette menu.



Click the start point of the arc, or type a 3D coordinate to place the point exactly.

If you click the endpoint of an existing keypoint curve, the new arc will attach itself to the end of that curve. Dragging the common endpoint will move both curves.



Click a second point that will lie on the arc, or type a 3D coordinate to place the point exactly.
Click the to add the point freely.
Click the to align the point horizontally to the first point.
Click the to align the point vertically to the first point.



Click the end point of the arc, or type a 3D coordinate to place the point exactly.
Click the to add the point freely.
Click the to align the point horizontally to the first point.
Click the to align the point vertically to the first point.

As you drag the end point, the Arc (three point) tool displays the radius of the arc in current linear units.

Options

Arc Degree

Specifies the degree of the curve. The values range from 2 to 7. The default is 5.

Arc Spans

Specifies the number of spans in the curve. The values range from 1 to 14. The default is 1.

The sum of the degree and number of spans cannot exceed 16.

When creating rational geometry, as set in Preferences > Construction options , the Arc Spans option is not available.