Wwise Unreal Integration

When an object appears between the emitter and the listener, the sound can pass through the object. Spatial Audio models this phenomenon by filtering the direct path of the sound. Transmission loss values ranging from 0 to 1 can be applied on AkSurfaceReflectorSetComponent, AkGeometryComponent or AkRoomComponent components. The transmission loss value is then sent to Wwise where the associated filter is applied according to the transmission curves of the sound's Attenuation ShareSet. Typically, a value of 1.0 represents full loss, and a value of 0.0 indicates that sound can be transmitted through the geometry without any loss.

Note: The Preparation for the Spatial Audio Tutorials must be completed prior to starting this tutorial. Most importantly, these two steps must be done. In Wwise, enable Diffraction and Transmission in the Positioning tab of sounds to be diffracted. In Unreal, set the Refresh Interval of AkAmbientSound to 0. This tutorial only uses the Spatial Audio diffraction system.

The transmission loss value of a path is the maximum transmission loss value the sound encounters in a direct path from the emitter to the listener. The chosen transmission loss value can be from a geometry or a room.

1. On AkSpatialAudioVolume actors,
   1. if surface reflectors are enabled, a transmission loss value can be associated with each acoustic surface
      
   2. if room is enabled, a transmission loss value can be associated to the walls of the room.
      
2. On an AkGeometryComponent, a transmission loss value can be overriden in the Acoustic Properties Override section.
   • Here is the collision mesh override:
     
   • You can also override each material of the static mesh:
     
   • You can also set the transmission loss value for each Physical Material in the Geometry Surface Properties Table, which you can access through the Integration Settings.
     

Transmission loss attenuates the sound using the Transmission curves in the sound's Attenuation ShareSet. When the curves are set to Use Project Occlusion, they use the Occlusion curves in the Obstruction/Occlusion tab of the Project Settings in the Authoring application.

See also

• Spatial Audio Transmission
• Rooms and Portal Transmission