Cap

The Cap command fills planar holes in objects with planar faces.
It is caplable of capping surfaces, Meshes and SubDs.

Command-line options (Mesh/SubD only)
-DeleteInput: Specify if the input object will be deleted.
-Crease
Yes: Do not weld the vertices along the cap boundary.

No: Welds the vertices along the cap boundary.

Triangles
Yes: Fills a planar opening in a SubD or mesh with triangle faces.

No: Fills a planar opening in a SubD with a single face, or in a mesh with an n-gon.

Aditional Notes
Caps will always be made up of triangles when:
A SubD or mesh cap has a hole (an inner boundary).

Any part of the outer boundary of a SubD cap is not convex.

You can use the MergeFaces command to combine the triangles into a single face as needed.
For more information, please refer to the Rhino documentation.
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