How to play Death Animation whenever the enemies Health is 0? (In Blueprints or C++ and spawn again with the AI Controller)

DeadFalconking · December 27, 2021, 5:52pm

Oh yeah thanks, I’ll try it!

MostHost_LA · December 28, 2021, 12:28am

Because that’s actually the proper way to do it.
Destroy gets rid of it and any variable.
when you re-spwan you usually create a new actor from the class so that all the variables are reset.

DeadFalconking · December 28, 2021, 6:36am

The Problem: Game crashes after 3-4 seconds or so, showing this error.

Assertion failed: DelegateOwner->IsValidLowLevelFast(false) [File:D:\Program Files\Epic Games\UE_4.27\Engine\Source\Runtime\CoreUObject\Public\UObject/SparseDelegate.h] [Line: 196]

UE4Editor_Core
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UE4Editor_Monster_Shooter_0015!AEnemy::BeginPlay() [D:\Game Development and Programming\Monster_Shooter\Source\Monster_Shooter\Enemy.cpp:48]
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UE4Editor_Monster_Shooter_0015!AEnemy::Tick() [D:\Game Development and Programming\Monster_Shooter\Source\Monster_Shooter\Enemy.cpp:58]
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References:

Error code line 48 in Enemy.cpp file.

DamageCollision->OnComponentBeginOverlap.AddDynamic(this, &AEnemy::OnHit);

Error code line 58 in Enemy.cpp file.

if (!CurrentVelocity.IsZero())

BP_Enemy Blueprint.

image857×332 65 KB

image1095×215 51.8 KB

Idle / Walk to Dead Transition in BP_Enemy_Animation Blueprint.

Limanima · December 28, 2021, 9:49am

Because that’s actually the proper way to do it.
Destroy gets rid of it and any variable.
when you re-spwan you usually create a new actor from the class so that all the variables are reset.

Yes, you are absolutely right, no problem there.
But what about setting “owner=self” in Spawn Actor? Wouldn’t that cause problems because “self” was destroyed?

DeadFalconking · December 28, 2021, 9:50am

Ok so what should I do now?

MostHost_LA · December 28, 2021, 11:45am

Owner on a character can’t really be self.
It usually the player or AI controller that owns the actor…

DeadFalconking · December 28, 2021, 11:46am

Okay thanks, I’ll see if that works!

Limanima · December 28, 2021, 1:57pm

Just don’t set the owner.
No actor owns the enemy.

DeadFalconking · December 29, 2021, 5:22am

@MostHost_LA @Limanima Game Crashes: Even if I set the Owner as GetAIController. Even if I set the GetPlayerPawn. Even if I don’t set any Owner.

MostHost_LA · December 29, 2021, 5:26am

“Game crahses” means nothing.
at a bare minimum you need to share an error message.
Probably install the debug symbols and cause the error again - so you can get a meaningful error.

DeadFalconking · December 29, 2021, 5:27am

Okay here you go.

Assertion failed: DelegateOwner->IsValidLowLevelFast(false) [File:D:\Program Files\Epic Games\UE_4.27\Engine\Source\Runtime\CoreUObject\Public\UObject/SparseDelegate.h] [Line: 196]

UE4Editor_Core
UE4Editor_Core
UE4Editor_Monster_Shooter_0015!AEnemy::BeginPlay() [D:\Game Development and Programming\Monster_Shooter\Source\Monster_Shooter\Enemy.cpp:48]
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
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UE4Editor_CoreUObject
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UE4Editor_Engine
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UE4Editor_Monster_Shooter_0015!AEnemy::Tick() [D:\Game Development and Programming\Monster_Shooter\Source\Monster_Shooter\Enemy.cpp:58]
UE4Editor_Engine
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MostHost_LA · December 29, 2021, 5:29am

Whatever you are feeding into it is an NON valid variable.

DeadFalconking · December 29, 2021, 5:31am

So is there any way to fix this, or I have to find it?

MostHost_LA · December 29, 2021, 5:51am

Have you looked at any particular respawn tutorial?
Or are you just guessing what to do?

We have no idea what you are actually doing code or BP wise, so it’s near impossible to offer suggestions short of general things…
Like, try to validate the variable before use…

DeadFalconking · December 29, 2021, 5:59am

I am referring to this UE4 docs tutorial - Spawning and Destroying an Actor | Unreal Engine Documentation

MostHost_LA · December 29, 2021, 6:54am

Which part in there are you stuck on / where did the owner really come into play?

Also - where is this code?
Surely you aren’t expecting the actor to Spawn itself into existence?

DeadFalconking · December 29, 2021, 6:55am

Whenever I hit play after around 5 seconds the Game crashes showing that error message, basically when the Spawn Enemy function comes to play.

MostHost_LA · December 29, 2021, 6:58am

Doesn’t sound like you followed the tutorial.
I see nothing in there about owners at a glance.

At a base level.

Create an actor that manages spawning of units.

Create an array of classes. Populate the default values with however many entries you want to start to spawn.
Follow the tutorial to Spawn.
Use the array and a for loop to Spawn multiple.

Whenever a unit is destroyed, call an interface call to Spawn a new one.

Done.

DeadFalconking · December 29, 2021, 6:59am

Okay thanks I’ll try that.

DeadFalconking · December 29, 2021, 9:20am

Enemy is spawning but in random position all out of the map, I tried GetActorTransform, I tried this too.

image705×306 40.7 KB

This is where the BP_Spawner is almost in the end of the map.

Also now they are spawning and there is no crashes and stuff happening.