Working with G2 curves

G2 curves are mathematically smoother than Bézier curves.

To create a G2 curve:

1. Click Wireframe tab > Create panel > Curve > G2.
2. Input positions for the points of the curve.

   

   As you enter key points, a rubber-band curve is displayed showing how the curve is forming.

   If you want the curvature to be zero at the start point or end points, set the Curvature continuous options on the Curve page of the Options dialog (which is displayed by choosing File > Options > Application Options).

   Zero curvature has a flattening effect on the curve.

3. To finish curve creation, do one of the following:
   • Click on top of the last key point entered; if the intelligent cursor is enabled, the end symbol is displayed to indicate when clicking completes the curve.
   • Click the first key point to create a closed curve.
   • Click on the Quick Access toolbar.
   • Choose another option from the Wireframe tab > Create panel.

To edit a G2 curve:

1. Click on the G2 curve to display the Manage tab.

   The Manage tab > Curve Type panel > G2 option is selected automatically.

2. Select a point on the G2 curve you want to edit.

   Thisdisplays Bezier curve graphic handles on the curve for editing, but the curve remains a G2 curve if you drag the handles.

You can also edit a G2 curve in the following ways:

• Click Manage tab > Curve Type panel > Bezier.

  This displays Bézier curve graphic handles on the G2 curve. The G2 curve loses its G2 editing ability and can be edited only as a Bézier curve.

• Click Manage tab > Modify panel > Adjust > G2 Edit to display the G2 Curve Fairing dialog.
Tip: You can use these options to edit surface curves on a power surface. See Surface Modelling for more information.