Convert to NURBS
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Keyboard: CONVTONURBS
Converts surfaces and 3D solids to NURBS surfaces. You can convert surfaces that are created using the Convert to Surface command.
Select entities: Select a 3D solid or a surface to be converted to a NURBS surface, then press Enter.
To convert a mesh that is created with the Convert to Mesh command to a NURBS surface, first use the Convert to Surface or Convert to Solid command.
You can also convert two-dimensional entities to splines.
The Convert to NURBS command is typically used to convert solids and surfaces to NURBS surfaces, but it can also be used to convert two-dimensional entities, e.g., lines, polylines, arcs, circles, etc., to splines.