# TryGetSubmeshClassifications(MeshId, Allocator, out uint, out NativeArray<uint>, out NativeArray<uint>)

> Gets classification information for vertices or vertex sets for meshes obtained through XRMeshSubsystem.TryGetMeshInfos. This must be enabled through _submeshClassificationEnabled.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.XR](/engine/6000.7/script-reference/unityengine/xr.md)
* **Assembly:** UnityEngine.XRModule

## TryGetSubmeshClassifications(MeshId, Allocator, uint, NativeArray\<uint>, NativeArray\<uint>)

```csharp
public bool TryGetSubmeshClassifications(MeshId id, Allocator allocator, out uint elementsPerVector, out NativeArray<uint> vertexIndexVectors, out NativeArray<uint> classifications)
```

### Parameters

**** (\[MeshId]\(/engine/6000.7/script-reference/unityengine/xr/meshid)): A [MeshId](/engine/6000.7/script-reference/unityengine/xr/meshid.md) obtained earlier through TryGetMeshInfos for which to retrieve classification information**** (\[Allocator]\(/engine/6000.7/script-reference/unity/collections/allocator)): The [Allocator](/engine/6000.7/script-reference/unity/collections/allocator.md) type to use for the returned `NativeArray`s**** (\[uint]\(https\://learn.microsoft.com/dotnet/api/system.uint32)): The number of packed elements in `vertexIndexVectors` to treat as one classification unit. Platform-specific; for example, some platforms may use `1` for a single vertex per classification; others may use `3` to represent a triangle face per classification.**** (\[NativeArray\<uint>]\(/engine/6000.7/script-reference/unity/collections/nativearray1)): The indices referring to [Mesh](/engine/6000.7/script-reference/unityengine/mesh.md) vertices that the classifications apply to, coallated with `classifications`.**** (\[NativeArray\<uint>]\(/engine/6000.7/script-reference/unity/collections/nativearray1)): The opaque classification enumerations returned by the provider for the defined vertex components above.

### Returns

| Type                                                          | Description                                          |
| ------------------------------------------------------------- | ---------------------------------------------------- |
| [bool](https://learn.microsoft.com/dotnet/api/system.boolean) | True if the retrieval is successful, otherwise False |

### Remarks

Use this to retrieve semantic classifications for vertex or vertex group components of the meshes tracked by the subsystem.

This method always returns new [NativeArray\<T>](/engine/6000.7/script-reference/unity/collections/nativearray1.md)s, even when there are no results. The caller is responsible for disposing the returned [NativeArray\<T>](/engine/6000.7/script-reference/unity/collections/nativearray1.md), though specifying the appropriate [Allocator](/engine/6000.7/script-reference/unity/collections/allocator.md) will manage this for you.

Additional Resources: [XRMeshSubsystem.TryGetMeshInfos](/engine/6000.7/script-reference/unityengine/xr/xrmeshsubsystem/trygetmeshinfos.md)