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# backFaceStencil

The stencil descriptor for back-facing primitives.

```
@NSCopying var backFaceStencil: MTLStencilDescriptor! { get set }
```

## Discussion

The default value is `nil`, which indicates the stencil test is disabled for the back-facing primitives. For more information, see [`MTLStencilDescriptor`](/documentation/Metal/MTLStencilDescriptor).

---

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