To create a 3D curve from two planar orthogonal curves

1. Make sure that the curves are planar. You can use the Curve Edit > Curve Planarize tool to flatten the curves.
2. Click the Combine Curves icon , or choose Curve Edit > Create > Combine Curves from the Palette.
3. Click the first profile curve.
4. Click the second profile curve.
5. If Automatic Direction is off, or if Combine Curves cannot figure out the projection directions, it prompts you to enter
   • the projection axis of the first curve (x, y or z), and
   • the projection axis of the second curve (x, y, or z).
6. Combine Curves creates the curve by projecting the two planar curves into a 3D curve.

   In some cases, more than one solution may be possible. In these cases, Combine Curves creates all the possible curves. When it is finished, delete the curves you do not want.

Tips and notes

• If the Create History option is on, you can edit the profile curves and the 3D curve automatically updates.
• Use the Rebuild curve tool in most cases to reduce the complexity of the resulting curve.