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# vignettingPower

The amount of the rendered scene to darken with a vignette effect.

```
var vignettingPower: CGFloat { get set }
```

## Discussion

A vignette effect darkens the edges and corners of the rendered scene, simulating the effect of lens and barrel shape on the image produced by a physical camera. Higher values result apply the darkening effect to a broader area around the edges of the rendered image, and lower values apply the effect to a smaller area, leaving more of the rendered image at full brightness. The default value of `0.0` results in no vignetting effect.

This property controls the area of the rendered image to be darkened; the [`vignettingIntensity`](/documentation/SceneKit/SCNCamera/vignettingIntensity) property controls the level of darkening applied to those areas.

To enable this behavior, you must first enable the [`wantsHDR`](/documentation/SceneKit/SCNCamera/wantsHDR) setting.

---

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