# SubDChainType 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 SubDChainType
```

SubD::ChainType specifies what edge and vertex tag tests are used when creating edge chains.

## Values

| Name | Value | Description |
| --- | --- | --- |
| Unset | 0 | Unset. |
| MixedTag | 1 | All types of edges and vertices can be in the chain. |
| EqualEdgeTag | 2 | Every edge in an edge chain has the same smooth/crease property. |
| EqualEdgeAndVertexTag | 3 | Every edge in an edge chain has the same smooth/crease edge tag and interior vertices have the corresponding smooth/crease vertex tag. |
| EqualEdgeTagAndOrdinary | 4 | Every edge in an edge chain has the same smooth/crease property and every edge has the same number of faces. If the edges have 1 face, then interior vertices have valence = 3. If the edges have 2 faces, then interior vertices have valence = 4. |
| EqualEdgeAndVertexTagAndOrdinary | 5 | Every edge in an edge chain has the same smooth/crease edge tag, every edge has the same number of faces, and interior vertices have the corresponding smooth/crease vertex tag. If the edges have 1 face, then interior vertices have valence = 3. If the edges have 2 faces, then interior vertices have valence = 4. |