Register a sight sense missing tidbit.

[bormanst]

Thanks for the posting. It all worked except for the indicated note (got it working with the BP extension, as well, but not pure C++). Did a little digging into engine to see what the bAutoRegisterAllPawnsAsSources flag was controlling.

ShouldAutoRegisterAllPawnsAsSources() returns bAutoRegisterAllPawnsAsSources

In AIPerceptionSystem.cpp: ShouldAutoRegisterAllPawnsAsSources() triggers RegisterSource(SenseID, Pawn).

So I just added the equivalent method call to BeginPlay() which registers the player pawn as a new source to monitor. AIDebugger now shows player being tracked while other pawns ignored.

PlayerCharacter.h >>
...
virtual void BeginPlay() override;
...

PlayerCharacter.cpp >>
...
void APlayerCharacter::BeginPlay()
{
Super::BeginPlay();

// RegisterSource:  Should probably validate GetWorld and PerceptionSystem???
UAIPerceptionSystem::GetCurrent(GetWorld())->RegisterSource(*this);

}
...

I found in some cases the AIPerceptionSystem was not fully initialized on first spawn of the player. Not sure how to properly address that one but there is a simple workaround using a timer.

void APlayerCharacter::BeginPlay()
{
Super::BeginPlay();

// Set RegisterSourceCheck.
GetWorldTimerManager().SetTimer(RegisterSourceTimerHandle, this, &APlayerCharacter::RegisterCheck, 1.0f, true);

}

void APlayerCharacter::RegisterSourceCheck()
{
// Check IsSenseInstantiated.
if (UAIPerceptionSystem::GetCurrent(GetWorld())->IsSenseInstantiated(UAISense::GetSenseID<UAISense_Sight>()))
{
// RegisterSource.
UAIPerceptionSystem::GetCurrent(GetWorld())->RegisterSource(*this);

	// ClearTimer.
	GetWorldTimerManager().ClearTimer(RegisterSourceTimerHandle);
}

}

The timer runs a few ticks before the IsSenseInstantiated becomes true. The bAutoRegisterAllPawnsAsSources=true switch probably allows the engine to fully instantiate UAIPerceptionSystem prior to any spawning any pawns because it knows what's coming. Whereas, setting bAutoRegisterAllPawnsAsSources=false and then manually adding Senses/Sources with classes may cause the AIPerceptionSystem to finalize after the designated classes are loaded???

FWIW