How to create one or many transitional surface(s) between multiple continuous surface boundaries, by specifying any number of cross-sections (profile curves) between the primary surfaces.

The primary surfaces’ edges may be trimmed, untrimmed, curves on surface, or isoparms.

You can place any number of profile curves (cross-sections) at any point between the primary surfaces’ boundaries. Profiles can be any type of curves, including blend curves and surface boundaries.

1. Choose Surfaces > Multi-Surface Blend > Profile Blend ❒ to open the option window.
2. Select all the surface boundary curves.

   The first set of boundaries is highlighted in purple, and the second set of boundaries is highlighted in yellow.

   Note

   If Chain Pick is turned on in the option window, selecting the boundary of one surface will also select all other boundaries that are tangent continuous with it.

3. Press the Go button.
4. Select all the profile curves that will define the transitional surface.

   The selected profile curves are highlighted in white.

   

   After you select the first profile curve, a Recalc button appears.

5. Press the Recalc button when you’re finished selecting the profile curves.
   

   Blend surfaces are built between the primary surfaces.

6. Set Surface Type to Single surface in the option window, and click Recalc to compute a single blend surface if desired.
   
7. Modify other parameters in the option window if necessary, then click Recalc to rebuild the surface (or turn on Auto Recalc. in the option window for the recalculation to happen automatically).
8. Add or delete input curves by clicking on them, to further refine the transitional surface.
   Note

   Since the input curves have construction history, modifying them also updates the transitional surfaces.

9. Turn on Continuity Check in the option box to evaluate the continuity of the blend surface with the primary input surfaces. See the section Troubleshooting trimmed surfaces for more information.