How do I initialise an FRadialDamageEvent?

Development Programming & Scripting
1

I am trying to deal radial damage to nearby pawns, but I’m having trouble figuring out how to create my FRadialDamageEvent struct properly. I have the following code which calls TakeDamage():

FRadialDamageEvent DamageDetails;
DamageDetails.Origin = this->GetActorLocation();
DamageDetails.Params.InnerRadius = 100.f;
DamageDetails.Params.OuterRadius = 400.f;
DamageDetails.Params.BaseDamage = 500.f;
DamageDetails.Params.DamageFalloff = 1.f;
Opponent->TakeDamage(2.f, DamageDetails, GetController(), EquippedWeapon);

In my character class I have a TakeDamage override which does this:

float fDamageToApply = Super::TakeDamage(DamageAmount, DamageEvent, EventInstigator, DamageCauser);
FString szApplied = FString::Printf(TEXT("OUCH! Damage applied: %f"), fDamageToApply);
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Yellow, szApplied);
return fDamageToApply;

But the value of fDamageToApply is always 0. I’m not sure what values I’m meant to supply. Does anyone have a code snip I could look at?

2

Usually the damage returned by Super::TakeDamage is the same passed on DamageAmount, but if you have TakeDamage overrides on the parent classes of that class it’s safer to use what you’re doing. Anyway, i would suggest debugging and stepping into the Super::TakeDamage function to figure out why 2.f as a parameters somewhere along the way became 0.

3

Yeah, I was hoping to avoid that. I’m not building from source so I don’t have the engine code to debug through, but it looks like I’m going to have to.

4

Just try with different values or try using FPointDamageEvent to see if the return value is still different from the one you pass as a parameter to try to narrow it down.

5

I spent a whole afternoon doing just that, but got no joy :frowning:

6

Ok, so I figured out what was wrong. I stumbled across the function UGameplayStatics::ApplyRadialDamageWithFalloff(…) which shows how to form the request properly and you need to fill out a field in the struct which contains all the component hits. Based on everything I’d read, I assumed that the fact you are calling Opponent->TakeDamage() you did not need to supply this, but you do.

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