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# AVAudio3DMixingRenderingAlgorithm

The types of rendering algorithms available per input bus of the environment node.

```
enum AVAudio3DMixingRenderingAlgorithm
```

## Overview

The rendering algorithms differ in quality and CPU cost. [`AVAudio3DMixingRenderingAlgorithm.equalPowerPanning`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/equalPowerPanning) is the simplest panning algorithm and the least expensive computationally.

When rendering to multichannel hardware, most of the rendering algorithms only render to channels 1 and 2, excluding [`AVAudio3DMixingRenderingAlgorithm.soundField`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/soundField) and [`AVAudio3DMixingRenderingAlgorithm.auto`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/auto).

## Topics

### Rendering Algorithms

[`AVAudio3DMixingRenderingAlgorithm.auto`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/auto)

Automatically selects the highest-quality rendering algorithm available for the current playback hardware.

[`AVAudio3DMixingRenderingAlgorithm.equalPowerPanning`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/equalPowerPanning)

An algorithm that pans the data of the mixer bus into a stereo field.

[`AVAudio3DMixingRenderingAlgorithm.HRTF`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/HRTF)

A high-quality algorithm that uses filtering to emulate 3D space in headphones.

[`AVAudio3DMixingRenderingAlgorithm.HRTFHQ`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/HRTFHQ)

A higher-quality head-related transfer function rendering algorithm.

[`AVAudio3DMixingRenderingAlgorithm.soundField`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/soundField)

An algorithm that renders to multichannel hardware.

[`AVAudio3DMixingRenderingAlgorithm.sphericalHead`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/sphericalHead)

An algorithm that emulates 3D space in headphones by simulating interaural time delays and other spatial cues.

[`AVAudio3DMixingRenderingAlgorithm.stereoPassThrough`](/documentation/AVFAudio/AVAudio3DMixingRenderingAlgorithm/stereoPassThrough)

An algorithm to use when the source data doesn’t need localization.


---

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