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# PHASEMaterial

Surface characteristics that determine the acoustic properties of an object.

```
class PHASEMaterial
```

## Overview

To specify the physical texture of a sound source or occluder, define the `materials` argument of the [`PHASEShape`](/documentation/PHASE/PHASEShape) initializer, [`init(engine:mesh:materials:)`](/documentation/PHASE/PHASEShape/init(engine:mesh:materials:)). The [`PHASEMaterialPreset`](/documentation/PHASE/PHASEMaterialPreset) contains the surface types with which you define the `preset` argument of this class’s [`init(engine:preset:)`](/documentation/PHASE/PHASEMaterial/init(engine:preset:)) initializer.

## Topics

### Creating a Material

[`-  initWithEngine:preset:`](/documentation/PHASE/PHASEMaterial/init(engine:preset:))

Creates a material with the given preset.

## Relationships

### Conforms To

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`Hashable`](/documentation/Swift/Hashable)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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