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# intensity

A number between `0.0` and `1.0` that modulates the effect of the material property. Animatable.

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

## Discussion

The default intensity is `1.0`. Reducing the intensity fades out the contents of the material property, causing different effects depending on which visual property of an [`SCNMaterial`](/documentation/SceneKit/SCNMaterial) object it represents:

- For the [`normal`](/documentation/SceneKit/SCNMaterial/normal) property, intensity varies the apparent roughness of the normal-mapped surface. Reducing intensity makes the surface appear more smooth.
- For the [`multiply`](/documentation/SceneKit/SCNMaterial/multiply) property, reducing intensity blends the material property’s colors with white, effectively reducing the strength of the color multiplication effect.
- For all other properties, reducing intensity dims the material property’s contents.

You can animate changes to this property’s value. See [Animating SceneKit Content](/documentation/SceneKit/animating-scenekit-content).

---

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