# GetContactPointFaceIndex(int)

> Get the index of a face that a particular contact point belongs to in this ContactPairPoint.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.5/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public uint GetContactPointFaceIndex(int contactIndex)
```

### Parameters

**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): The [ContactPairPoint](/engine/6000.5/script-reference/unityengine/contactpairpoint.md) index.

### Returns

| Type                                                         | Description                                    |
| ------------------------------------------------------------ | ---------------------------------------------- |
| [uint](https://learn.microsoft.com/dotnet/api/system.uint32) | Index of a face this contact point belongs to. |

### Remarks

Only valid if one of the colliders in this pair is a non-convex MeshCollider. In this case, that collider will always be the second shape of the pair. A value of 0xffffFFFF indicates an error, which could be none of the Colliders were non-convex MeshColliders, or that the contact point index was out of bounds. Use this with [Mesh.triangles](/engine/6000.5/script-reference/unityengine/mesh/triangles.md).