Create a trimmed surface from up to 8 boundary curves

Create a surface with up to 8 sides

1. Choose Surfaces > Boundary Surfaces > N-sided from the tool palette.

   The N-sided Control window appears.

   
2. Click the first boundary curve.
   • You can use free curves, isoparametric curves, curves on surface and/or trim edges.
   • To maintain continuity with another surface, you must pick an isoparametric curve or trim edge on that surface, not a construction curve used to create that surface.
     
3. Click each remaining curve (up to a total of 8) in clockwise or counter-clockwise order.
   • If two adjacent boundary curves do not intersect, the N-sided tool averages their endpoints.
   • If a curve intersects the first curve, N-sided creates the surface. Otherwise it displays the Go button and allows you to continue selecting curves.
   • If you have selected all the boundary curves, click Go.
4. Use the options in the N-sided Control window to set the continuity you want at each edge (see below).

Edit the construction history of an N-sided surface

1. Pick the surface you want to edit.
2. Choose Surfaces > Boundary Surfaces > N-sided from the tool palette.

   The N-sided Control window appears.

3. Use the curve modification tools (in the Transform, Curve Edit, and Object Edit palettes) to reshape the curves used to create the surface, and use the N-sided Control window to change the surface creation options.

Tips and notes

• For best results, use the snapping tools to make sure the curves intersect at their endpoints. This is not required, but it makes the resulting surface more predictable.
• If you want to see only the effects of the Center Adjust options, set all the edges to Free continuity, since free edges have the fastest interaction.
• The N-sided tool does not use labels to show whether the desired continuity was achieved. Instead you must look in the Surface Continuity Feedback section of the N-sided Control window.

  Click an edge named in the N-sided Control window to view the continuity feedback for that edge.

  Lines of text indicate whether continuity was achieved. If it was not achieved, text boxes show how far out of tolerance the current edge is for each type of continuity.