Interaction Effects

UEDInteractionEffectsComponent lets you attach reusable effects to any interactable without changing interaction logic.

It listens to UEDInteractableComponent events and plays one or more effects on a target mesh component (StaticMesh or SkeletalMesh).

Add to an interactable actor

1. Add UEDInteractableComponent to your actor.
2. Add UEDInteractionEffectsComponent to the same actor.
3. In UEDInteractionEffectsComponent:
   • Pick TargetMode:
     • FirstMeshComponent (recommended default)
     • OwnerRootPrimitive (if the root is already the mesh)
     • AllMeshComponents (apply to every mesh)
     • TaggedPrimitiveComponents (use TargetComponentTag)
     • SpecificComponent (use SpecificTargetComponent)
   • Add effect classes to one or more event lists:
     • Effects_OnInteractionSuccessful (non-destruction successful interactions)
     • Effects_OnDamagedNotDestroyed (HitPoints damage ticks while HP > 0)
     • Effects_OnInteractionDenied

Effect selection is class-based (TSubclassOf<UEDInteractionEffect>): create a Blueprint class derived from an effect, tune its default properties, then select that class in the array.

Built-in effects

The plugin provides these effect classes:

• UEDInteractionEffect_ShakeRotation
• UEDInteractionEffect_ShakeLocation
• UEDInteractionEffect_ScalePulse
• UEDInteractionEffect_MaterialScalarPulse
• UEDInteractionEffect_Sound

Context available to effects (Blueprint)

When an effect instance starts it receives a FEDInteractionEffectContext with:

• Interaction: InteractionContext (tag, instigator, interactable actor, etc.)
• Target: TargetComponent plus booleans for StaticMesh/SkeletalMesh
• View: InstigatorViewLocation, InstigatorViewDirection
• Location data:
  • InteractableLocation
  • TargetComponentLocation
  • ResolvedHitLocation, ResolvedHitNormal, ResolvedHitBoneName
  • If a direct trace to the interactable was detected: bHasDirectHit, DirectHitLocation, DirectHitNormal

Hit resolution behavior:

• If the target component is directly traceable along the view ray, the component hit is used.
• Otherwise, the closest point on collision is used as a fallback.
• If collision data is unavailable, the component bounds origin is used.

Creating a custom effect in Blueprint

1. Create a Blueprint class derived from UEDInteractionEffect.
2. Set up how the instance should be created:
   • Use InstanceClass with a Blueprint class derived from UEDInteractionEffectInstance, or
   • Override CreateInstance and return an object created with Construct Object from Class.
3. Create a Blueprint class derived from UEDInteractionEffectInstance.
4. Override:
   • OnStart
   • OnTick (optional)
   • OnFinish (optional)
5. In the instance, use GetEffectContext() to access view/hit/target data.