DeprojectScreenToWorld — convert 2D screen position to 3D world ray

Pure node. WorldDirection is the ray direction — multiply by large number and add WorldLocation to get the trace end point for mouse-to-world ray casting.

DeprojectScreenPositionToWorld — convert 2D screen coords to 3D world ray

APlayerController method. WorldDirection is the ray direction for line traces.

DestroyActor — remove actor from the world

DrawDebugLine — draw debug line in world

UKismetSystemLibrary::DrawDebugLine.

Create a Blueprint Actor that plays a sound and spawns a particle effect at its location when destroyed

Asset reference points to a Blueprint that no longer exists

Why: Some node or variable hardcoded a reference to BP_{name}, but that file was deleted or moved. The Asset Registry can't resolve it. Fix: Either: (a) re-create BP_{name} if accidentally deleted (Content Browser → right-click → Blueprint Class), or (b) update the reference to point at the correct existing Blueprint, or (c) make the reference soft (TSoftObjectPtr) so missing assets don't fail compilation.

ApplyDamage — deal damage to a target actor

UGameplayStatics::ApplyDamage. Triggers EventAnyDamage on target.

ProjectWorldLocationToScreen — project 3D location to 2D screen coordinates

APlayerController method.

Not_PreBool — logical NOT

Create a Blueprint for a projectile that moves forward, bounces off walls, and explodes after 3 seconds