---
title: anisotropyAngle
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/physicallybasedmaterial/anisotropyangle-swift.property
---

# anisotropyAngle

The angle at which the anisotropic direction of the material is oriented, influencing the reflection and appearance of surface highlights.

## Declaration

```swift
var anisotropyAngle: PhysicallyBasedMaterial.AnisotropyAngle { get set }
```

## Mentioned in

Applying realistic material and lighting effects to entities

## Discussion

Discussion This property controls the scattering angle for anisotropic objects. If anisotropyLevel is 0.0, this property has no effect. This property takes a value between 0.0 and 1.0 or a UV-mapped grayscale image specifying angles for different parts of the entity. A value of black (0.0) means a rotation of 0° and a value of white (1.0) indicates a rotation of 360°. To determine the anisotropyAngle value from an angle, divide the desired angle in degrees by 360.0 or the desired angle in radians by pi times 2. let angleDegrees = Float(125.0) let anisotropyAngleFromDegrees = angleDegrees / 360.0

let angleRadians = Float(2.181662) let anisotropyAngleFromRadians = angleRadians / (Float.pi * Float(2.0)) The following example shows how to specify anisotropyAngle using single values for the entire material: material.anisotropyAngle = .AnisotropyAngle(floatLiteral: 0.25) This example shows how to specify anisotropy using a UV-mapped image texture for anisotropyLevel and a separate image for anisotropyAngle: if let anisoLevelResource = try? TextureResource.load(named: "entity_aniso_level") {     let anisoLevelMap = MaterialParameters.Texture(sheenResource)     material.anisotropyLevel = .init(texture: anisoLevelMap) } if let anisoAngleResource = try? TextureResource.load(named: "entity_aniso_angle") {     let anisoAngleMap = MaterialParameters.Texture(anisoAngleResource)     material.anisotropyAngle = .init(texture: anisoAngleMap) }

## See Also

### Adding anisotropy

- [anisotropyLevel](realitykit/physicallybasedmaterial/anisotropylevel-swift.property.md)