Overlap Events in C++ - Unreal C++ Course #9

Unreal has very good tools for visual scripting with blueprint but of course, there's always those who want to write their code. unreal offers scripting in c++. and while that might sounds like a nightmare, it's not as bad as you think. So come along and let's find out all about C++
Join the discord for any help you need! : / discord
support the channel and development over on patreon : / thegamingcaves

[@StonegazeSteam]

I realized that you need to toggle on "Generate Overlap events" in the collider itself. This little missing detail has been causing me unreasonable pain for over a week. I LIVE for those "Eureka!" moments.

[@StonegazeSteam]

13:13 For some reason, I don't get "Collision Sphere" to appear on the editor like it does here. I try to run a "if(CollisionSphere) " as a null-check but get nothing and the overlap delegation doesn't happen.

[@thegamedevcave]

make sure the variable you make for it in the header file is marked as a UProperty and then in the cpp file inside the constructor you assign it a value with createDefaultSubObject. Then, it's usually best to do a proper recompile of the engine when youve just added a new component like this instead of using live coding too. Live coding can be a little weird with newly added classes or components.

[@StonegazeSteam]

@@thegamedevcave I ran it again and it does detect the CollisionSPhere, but no overlap still.

[@thegamedevcave]

@@StonegazeSteam also make sure that the function you set up to run on overlap is a ufunction. For some reason any function you want to bind to a delegate needs to be a ufunction

[@StonegazeSteam]

@@thegamedevcave I still have issues with hit detection. I made another blueprint actor class purely on blueprints and it works fine. But the C++ still baffles me In BeginPlay(), I have CollisionSphere->OnComponentBeginOverlap.AddDynamic(this, &ABaseProjectile::BeginOverLap); void ABaseProjectile::BeginOverLap(UPrimitiveComponent *OverlappedObject, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult) { UNiagaraFunctionLibrary::SpawnSystemAtLocation(this,ImpactParticles, GetActorLocation()); GEngine->AddOnScreenDebugMessage(-1,5.f,FColor::Red,TEXT("HIT")); BulletHit(); Destroy(); }

[@Drs.1102]

Hi, I have followed your tutorial and other tutorials as well, but I keep getting this error, do you have any suggestions? "Cannot convert void(APushCharacterActor::*)(UPrimitiveComponent*, AActor*, UPrimitiveComponent*, signed int, bool, FHitResult&) to parameter type TBaseDynamicDelegate<FNotThreadSafeDelegateMode, void, UPrimitiveComponent*, AActor*, UPrimitiveComponent*, signed int, bool, const FHitResult&>::TMethodPtrResolver<APushCharacterActor>::FMethodPtr (aka void(APushCharacterActor::*)(UPrimitiveComponent*, AActor*, UPrimitiveComponent*, signed int, bool, const FHitResult&)),because source function and target function have different 6th parameter types: FHitResult& and const FHitResult&"

[@thegamedevcave]

this looks like an error where you're trying to bind a function with the wrong set of paramaters to the delegate. Delegates only take functions with the same paramaters as the delegate is set up for (when the delegate is called, that way it can pass through information) so double check your function's paramaters and see if they match with the ones in the video. Or what's probably better, try to find the unreal engine documentation on this deleagte to see what signature (the paramaters) it takes.

[@OrangePanda-epic]

👍