# Sandbox.PolygonMesh.FindEdgeRibs

```csharp
int FindEdgeRibs(IReadOnlyList<HalfEdgeHandle> edges, out List<List<HalfEdgeHandle>> outLeftRibs, out List<List<HalfEdgeHandle>> outRightRibs)
```

### Parameters

- `edges` (`IReadOnlyList<HalfEdgeHandle>`)
- `out outLeftRibs` (`List<List<HalfEdgeHandle>>`)
- `out outRightRibs` (`List<List<HalfEdgeHandle>>`)

### Returns

`int`

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