I first came across the issue when creating a behavior tree service. A BlueprintCallable was always returning an empty (but not null) object on my device. But that was just the beginning.
I stripped it back and just created a simple method to test outside of BT…
.h
UFUNCTION(BlueprintCallable, Category = ElementalAI)
FVector VectorCheck();
.m
FVector AElementalAIController::VectorCheck()
{
return FVector(100, 100, 100);
}
Simple, works fine in the editor. Run it on the device? Enter a world of nightmares…
Image1: The output of this is nothing, no on screen message, nothing logged (as a result of the BP print). However, adding a UE_LOG to the code and it prints the expected value.
Image2: Even weirder, when I first tried it attached to the end of existing BP nodes it ran the previous node in an infinite loop (hundreds of “GiveWeapon” logged from C++).
As I said, initially I was returning an object, then tried a vector, also doesn’t work with a float.
It seems so random, sometimes it prints empty values (zero vector, or 0 float, or empty object which passes a not null test). Behaves differently depending where in a BP I place it in the BP chain. C++ logs output expected values but BP just aint working. I tried it on other classes in case my AI class was broken somehow, and still nothing.
I tired it in an empty project with a basic custom AI class and it works on the device.
I want to cry now.
I’m using 4.6.1, Android, Galaxy S5.
Please save me from this torment.
Forever in your debt.
