Create a flat surface inside a curve

Use Surfaces > Planar Surfaces > Set Planar to create a trimmed surface using a flat curve or set of curves as the outline. The curve or set of curves must define closed regions.

Fill a flat curve with a planar trimmed surface

1. Choose Surfaces > Planar Surfaces > Set Planar.
2. Pick individual curves, or drag a pick box around all the curves that define the planar surface or surfaces.
3. Check that all curves are picked, and click Go.

   A flat trimmed surface is created inside the curves.

How does the layout of multiple curves affect the surface?

• Curves that cross other curves are added together.
  
• Curves that are completely enclosed by other curves become holes.
  
• Curves may be separate from each other. This will create the appearance of separate surfaces.
  

1. Click Go.
   Note:

   You can mix boundary curves of different degrees without affecting the resulting surface.

   Note:

   The flatness of surfaces created with the Set Planar tool is not automatically maintained.

What if...?

The curve I want to use is not exactly flat?

See Flatten a basic curve onto a plane.