Wwise SDK 2019.2.15

Whether or not the portal is active/enabled. For example, this parameter may be used to simulate open/closed doors. Portal diffraction is simulated when at least one portal exists and is active between an emitter and the listener. Diffraction uses obstruction or the diffraction built-in game parameter, while transmission uses occlusion.

AkSpatialAudio.h の 318 行目に定義があります。