Remove spans or multiple knots

Remove multi-knots from a curve or surface, or attempt to rebuild a curve or surface so it has the same shape but fewer spans/patches.

Remove spans

1. Choose Curve Edit > Rebuild Curve or Surface Edit > Rebuild Surface .
2. Set Rebuild Type to Reduce Spans and turn Auto Update on.
3. Click the curves or surfaces.
   
4. Click Go.
   
5. Use the Tolerance control to adjust how much the tool can simplify the curves.

   A low value creates a more exact copy but simplifies the curve less. A high value is less exact but simplifies more.

   Tip:

   If you click an isoparametric curve or trim edge with the Rebuild curve tool, it will be rebuilt into a curve on surface. You can only rebuild these curves as degree 1 or 3 curves.

Remove multi-knots

1. Choose Curve Edit > Rebuild Curve or Surface Edit > Rebuild Surface .
2. In the Rebuild Type pop-up menu, choose Del Multi-Knots.
3. Click the curves or surfaces.
4. Click Go.