AudioEmitter is a helper object derived from X3DAUDIO_EMITTER used by SoundEffectInstance's Apply3D method.

See AudioListener.

Initialization

The default constructor creates a point emitter located at 0,0,0 facing +z and an update of +y for a mono source.

Helpers

In addition to setting the members of X3DAUDIO_EMITTER directly, there helper functions provided:

• SetPosition (FXVMECTOR) or (XMFLOAT3)

Sets the Position of the emitter.

• SetVelocity (FXMVECTOR) or (XMFLOAT3)

Sets the Velocity of the emitter.

• SetOrientation (FXMVECTOR forward, FXVMECTOR up) or (XMFLOAT3 forward, XMFLOAT3 up)
• SetOrientationFromQuaternion( FXMVECTOR )

Sets the OrientFront/OrientTop of the emitter.

• Update( FXMVECTOR newPos, XMVECTOR upDir, float dt )

Computes a direction and velocity for the emitter based on the existing Position and the newPos, updating the OrientFront/OrientTop to match.

Further Reading

http://msdn.microsoft.com/en-us/library/windows/desktop/microsoft.directx_sdk.x3daudio.x3daudio_emitter.aspx