# maskSource

> The AvatarMask used to mask transforms during the import process.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor](/engine/6000.0/script-reference/unityeditor.md)
* **Assembly:** UnityEditor

```csharp
public AvatarMask maskSource { get; set; }
```

### Remarks

A mask can be used to discard transform when importing a clip to reduce memory footprint for this clip. A source mask is only needed if [ModelImporterClipAnimation.maskType](/engine/6000.0/script-reference/unityeditor/modelimporterclipanimation/masktype.md) is set to [ClipAnimationMaskType.CopyFromOther](/engine/6000.0/script-reference/unityeditor/clipanimationmasktype/copyfromother.md) Additional Resources: [ClipAnimationMaskType](/engine/6000.0/script-reference/unityeditor/clipanimationmasktype.md).