---
title: Spatial Mixing
framework: phase
role: collectionGroup
role_heading: API Collection
path: phase/spatial-mixing
---

# Spatial Mixing

Define environmental characteristics that determine how sound plays in your app’s 3D soundscape.

## Overview

Overview Spatial mixing refers to the process by which PHASE emits one or more simultaneous sounds in 3D space and layers in optional environmental effects. For a walkthrough that demonstrates spatial mixing, see Playing sound from a location in a 3D scene.

## Topics

### Setup

- [PHASESpatialMixerDefinition](phase/phasespatialmixerdefinition.md)

### Sound Reflections and Resonance

- [PHASESpatialPipeline](phase/phasespatialpipeline.md)
- [PHASESpatialPipelineEntry](phase/phasespatialpipelineentry.md)
- [PHASESpatialCategory](phase/phasespatialcategory.md)
- [PHASESpatialPipeline.Flags](phase/phasespatialpipeline/flags-swift.struct.md)

### Distance Modeling

- [PHASEGeometricSpreadingDistanceModelParameters](phase/phasegeometricspreadingdistancemodelparameters.md)
- [PHASEEnvelopeDistanceModelParameters](phase/phaseenvelopedistancemodelparameters.md)
- [PHASEDistanceModelFadeOutParameters](phase/phasedistancemodelfadeoutparameters.md)
- [PHASEDistanceModelParameters](phase/phasedistancemodelparameters.md)

### Sound Directivity

- [PHASECardioidDirectivityModelParameters](phase/phasecardioiddirectivitymodelparameters.md)
- [PHASECardioidDirectivityModelSubbandParameters](phase/phasecardioiddirectivitymodelsubbandparameters.md)
- [PHASEConeDirectivityModelParameters](phase/phaseconedirectivitymodelparameters.md)
- [PHASEConeDirectivityModelSubbandParameters](phase/phaseconedirectivitymodelsubbandparameters.md)
- [PHASEDirectivityModelParameters](phase/phasedirectivitymodelparameters.md)

## See Also

### Audio Layering and Effects

- [PHASEChannelMixerDefinition](phase/phasechannelmixerdefinition.md)
- [PHASEAmbientMixerDefinition](phase/phaseambientmixerdefinition.md)
- [PHASEMixerDefinition](phase/phasemixerdefinition.md)
- [PHASEMixer](phase/phasemixer.md)
- [PHASEDefinition](phase/phasedefinition.md)