Steam Audio reflections not working in standalone

Development Programming & Scripting
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1

I’ve implemented Steam Audio in my project UE 5.4.4
I’m using realtime simulation for reflections, basiclly nothing is baked.
When launching the game from editor in viewport (like noramlly do) I can hear the Steam Audio kicks in, the occlusion, reverbs, reflections etc…
But when launching the game in standalone mode, only the occlusion works, the reverb and reflections not working at all.

I saw on the internet suggenstion to add -audiomixer to the launch commands but that didn’t do anything.

Is there anyone that knows how to solve this problem ? or what might be the cause for that ?

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This is the settings I implemented in the attenuation file.

2

I had the same issue and found a solution.

The reason is that SteamAudio plugin doesn’t process reflections if there are no Play-in-Editor instances found. When playing in standalone or packaged build, it can’t detect those instances, therefore just shuts down.

You can modify the source code of the plugin. File is SteamAudioModule.cpp in SteamAudio module. Tested in UE 5.5.4 and SteamAudio 4.6.1.

Find function:

bool FSteamAudioModule::IsPlaying()
{
    FScopeLock Lock(&PIEInitCountMutex);
    return PIEInitCount > 0;
}

there’s a comment in .h file that goes:

Returns true if we're currently playing (i.e., in a standalone game or in play-in-editor mode.

But actually that function returns ‘true’ only when playing in editor.
Add some conditions. The result is:

bool FSteamAudioModule::IsPlaying()
{
    FScopeLock Lock(&PIEInitCountMutex);
    return GEngine->IsInitialized()
    && GEngine->GetMainAudioDevice().IsValid()
    && (IsRunningGame() || PIEInitCount > 0);
}

IsRunningGame() returns ‘true’ in standalone process and ‘false’ in editor.
GEngine conditions are added in order to prevent crashes (IsPlaying() function gets called even before engine is initialized).

Don’t forget to add the following, if you want to package the plugin:

#include "Engine/Engine.h"

Build solution from your IDE. Now reflections should work as expected.

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