# Sandbox.PolygonMesh.IsEdgeOpen

```csharp
bool IsEdgeOpen(HalfEdgeHandle hEdge)
```

Determine if the specified edge is open (only has one connected face)

### Parameters

- `hEdge` (`HalfEdgeHandle`)

### Returns

`bool`

Declared in [Sandbox.PolygonMesh](/api/Sandbox.PolygonMesh).
Assembly: `Sandbox.Engine`.