# Sandbox.PolygonMesh.FindBoundaryEdgesConnectedToFaces

```csharp
void FindBoundaryEdgesConnectedToFaces(IReadOnlyList<FaceHandle> faces, out List<HalfEdgeHandle> outBoundaryEdges)
```

### Parameters

- `faces` (`IReadOnlyList<FaceHandle>`)
- `out outBoundaryEdges` (`List<HalfEdgeHandle>`)

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