# SubDCreationOptions.ConcaveCornerOption enum

Namespace: [Rhino.Geometry](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.geometry.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md)

```cs
public enum SubDCreationOptions.ConcaveCornerOption
```

Defines how concave corners are treated.

## Values

| Name | Value | Description |
| --- | --- | --- |
| Unset | 0 | The option is not set. |
| None | 1 | No concave corners. In general, this is the best choice. |
| AtMeshCorner | 2 | A concave subd corner will appear at input mesh boundary vertices where the corner angle >= MinimumConcaveCornerAngleRadians() and the number of edges the end at the vertex is >= MinimumConcaveCornerEdgeCount(). |