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# setStencilReferenceValue(front:back:)

Configures the encoder with different stencil test reference values for front-facing and back-facing primitives.

```
func setStencilReferenceValue(front frontReferenceValue: UInt32, back backReferenceValue: UInt32)
```

## Parameters

`frontReferenceValue`

A stencil test comparison value the render pipeline applies
to front-facing primitives.

`backReferenceValue`

A stencil test comparison value the render pipeline applies
to back-facing primitives.

## Discussion

The render pipeline applies `frontReferenceValue` to front-facing primitives and `backReferenceValue` to
back-facing primitives.

---

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