はじめに

The Spatial Audio module exposes a number of services related to spatial audio, notably to do the following:

• compute image sources for Reflect for a given geometry
• model sound propagation from Rooms and Portals by controlling 3D busses
• model sound propagation across geometry
• access the raw API of Reflect

Internally, Spatial Audio does the following:

• controls 3D busses by managing game objects and their properties (positions, auxiliary sends, obstruction, and occlusion)
• controls (multi-) positions and aux sends of Spatial Audio game objects
• runs geometric sound reflection, diffraction and transmission algorithms
• packages data for Reflect

It is an SDK component that works with the Wwise sound engine, as shown in the following flowchart.

Spatial Audioのサービス

Spatial Audio exposes three categories of service, described in separate sections:

• RoomとPortal
• Geometry
• Raw Image Sourcesを使用する

RoomとPortal are a simple, high-level geometry abstraction used to model propagation of sound emitters located in other rooms. Geometry uses triangles to compute image sources to simulate dynamic early reflections with Reflect, or to compute geometric diffraction. Spatial Audio also exposes helper functions to access the raw Reflect API directly (Raw Image Sourcesを使用する).

APIのセットアップ

Spatial Audio の関数と定義は SDK/include/AK/SpatialAudio/Common/ にあります。 Its main functions are exposed in the AK::SpatialAudio namespace.

初期化

Initialize Spatial Audio with AK::SpatialAudio::Init().

When using Spatial Audio, a single game object must be explicitly assigned as the Spatial Audio Listener. To do so, call AK::SpatialAudio::RegisterListener(), and pass the ID of the desired listener. このゲームオブジェクトはサウンドエンジンにおいても、リスナーとして登録してアサインする必要があります。Sound Engine内のリスナーについての詳細は、 リスナーの統合 を参照してください。

警告: Spatial Audioはトップレベルのリスナー1つだけに対応しています。

Spatial Audio Emitter

A game object becomes a Spatial Audio Emitter when it plays a sound that has one or more settings related to Spatial Audio enabled in Wwise Authoring:

• To enable room reverberation, enable game-defined auxiliary sends on the sound's General Settings tab.
  
• To enable reflection processing, assign an early reflection bus to the sound in one of the following ways:
  • On the sound's General Settings tab, assign the appropriate Auxiliary Bus.
  • Use AK::SpatialAudio::SetEarlyReflectionsAuxSend to assign the bus to the Game Object.
• To enable diffraction and transmission processing, select Enable Diffraction and Transmission on the sound's Positioning tab.

The position of a game object, either an emitter or a listener, is passed to the sound engine with AK::SoundEngine::SetPosition. Spatial Audio retrieves the position information directly from the sound engine to determine the source position for reflection and diffraction processing.

終了

Spatial Audioは、Wwiseサウンドエンジンを終了すると自動的に終了します。

参照

• Spatial Audioの概念
• RoomとPortal
• Geometry
• Third-Person Perspective and Spatial Audio
• Raw Image Sourcesを使用する
• Radial Emitters
• Wwise Helpの BusにPositioningを適用 。
• Wwise Helpの Emitter-Listenerの関連性 。
• Wwise Helpの Reflect 。