Unreal Engine 5.6 C++ Interaction System - Part 1: Interface, Base Class & UI Setup

In this first episode, we set the foundation of our Unreal Engine 5.6 C++ Interaction System. We’ll create a reusable interaction interface, build an InteractablesBase class, and add a sphere collision component to detect when the player enters and exits interaction range. Finally, we set up a simple UI widget to display prompts when interactable objects are nearby. To prevent non-player actors from triggering OnInteractionRangeEntered() and OnInteractionRangeExited(), we explicitly check that the overlapping actor is the player by casting to him inside an if statement. void AInteractablesBase::OnBeginOverlap(AActor* OverlappedActor, AActor* OtherActor) { if (AInteractionTutorialCharacter* PlayerCharacter = Cast＜AInteractionTutorialCharacter＞(OtherActor)) { OnInteractionRangeEntered(); } } void AInteractablesBase::OnEndOverlap(AActor* OverlappedActor, AActor* OtherActor) { if (AInteractionTutorialCharacter* PlayerCharacter = Cast＜AInteractionTutorialCharacter＞(OtherActor)) { OnInteractionRangeExited(); } }