Ak Spatial Audio volume not Watertight

Question

Hi, 

I'm having issues when creating Ak Spatial audio volumes.
When creating shapes like this one everything is ok

If I add a small extension , Wwise finds it's no more watertight  
Error    AK::SpatialAudio::SetGeometryInstance - Geometry Stairs4SurfaceReflector_Ak_TX_Brick0 (6742578234624) is not watertight. Geometry used for Room definition must be watertight if the Room is a Reverb Zone, or if containment in this Room is managed by Spatial Audio. If that is the case, add the missing triangles with a transmission loss value set to 0.         

Even template shapes like stairs are returning the same error
Any clue about this issue and how to fix this ? 
Thanks
Using Wwise 2023.1.2 and Unreal 5.3.2            
 

Answer 1

Hi!

Had the same exact issue when updating Unreal and Wwise to the latest versions.

Utilizing these rules seems to work:

1. Only 2 splits are "allowed" per brush shape.
2. Trying to align edges seems to work better and not having to concave shapes.
3. Duplicating Spatial Audio Volumes might cause errors even if the volumes looks the same.
4. Too complex brush shapes (especially concave ones) might cause you to divide it to several Spatial Audio Volumes with simpler brush shapes.

Best Regards,

Marcus Klang