UE5 Can something be done to stop Data Layers from stopping input during runtime in a Build?

Development World Creation
, , ,
1

We’ve been implementing Data Layers to stream our world and are having great success in optimization. Our levels are rich with content and have extreme Z depth and traversal.

However when we run our player character through the world, each time a new Data Layer loads, input is abruptly halted. (Still holding down the run/walk key, the player character stops)

Is there something still bound in the engine that is making this happen at runtime?
Is there something Epic engineers can do to fix this?
Is there something we can do to remedy this.

It only happens in a Build.

1 Like
2

We added this logging to PlayerInput.cpp

void UPlayerInput::FlushPressedKeys()
{
	UE_LOG(LogTemp, Warning, TEXT("UPlayerInput::FlushPressedKeys"));

Anytime a Datalayer changes state in a build this gets executed… but not in the editor… let the hunt begin…

In fact it gets called multiple times, which does not happen in the editor … see log snippet below

[2022.06.12-17.54.08:890][998]LogWorldPartition: Data Layer ‘RestorationStation’ state changed: Unloaded → Activated
[2022.06.12-17.54.08:890][998]LogWorldPartition: Data Layer ‘RestorationStation’ effective state changed: Unloaded → Activated
[2022.06.12-17.54.08:893][998]LogWorldPartition: Streaming performance changed: Good → Critical
[2022.06.12-17.54.08:925][998]LogStreaming: Display: FlushAsyncLoading: 0 QueuedPackages, 10 AsyncPackages
[2022.06.12-17.54.08:960][998]LogTemp: Warning: UPlayerInput::FlushPressedKeys
[2022.06.12-17.54.08:983][999]LogWorldPartition: Streaming performance changed: Critical → Good
[2022.06.12-17.54.11:934][136]LogTemp: Warning: UPlayerInput::FlushPressedKeys
[2022.06.12-17.54.15:328][296]LogTemp: Warning: UPlayerInput::FlushPressedKeys

Another example:

[2022.06.12-17.54.22:807][608]LogWorldPartition: Data Layer ‘TowerStairway’ state changed: Unloaded → Activated
[2022.06.12-17.54.22:807][608]LogWorldPartition: Data Layer ‘TowerStairway’ effective state changed: Unloaded → Activated
[2022.06.12-17.54.22:810][608]LogWorldPartition: Streaming performance changed: Good → Critical
[2022.06.12-17.54.22:829][608]LogStreaming: Display: FlushAsyncLoading: 0 QueuedPackages, 128 AsyncPackages
[2022.06.12-17.54.22:864][608]LogTemp: Warning: UPlayerInput::FlushPressedKeys
[2022.06.12-17.54.22:890][609]LogWorldPartition: Streaming performance changed: Critical → Good

1 Like
3

Found the problem. UE expects you will be playing a video when streaming something in…

in void FStreamingPauseRenderingModule::BeginStreamingPause( FViewport* GameViewport )
is hard coded to
// We started playing a movie
bMovieWasStarted = true;

Solution is to:
GEngine->RegisterBeginStreamingPauseRenderingDelegate(nullptr);

Then set it back after the datalayer is loaded

1 Like