To Create a Boundary Surface

1. Click

Style >

Surface. The Surface tab opens.

2. Click the

Primary chains collector and select at least two chains. A preview surface is displayed.

The chains must intersect to form a continuous boundary.

3. To add internal curves, click the

Internal chains collector, and then select one or more internal curves.

4. To modify a boundary or internal chain, trim or extend it.

5. To adjust the parameterization of the surface, click

Reparameterization and add reparameterization curves.

6. Click

OK.