SetCollisionProfileName — set collision profile by name

Common profiles: BlockAll, OverlapAll, BlockAllDynamic, OverlapAllDynamic, Pawn, NoCollision, Custom.

LaunchCharacter — launch character with velocity

ACharacter::LaunchCharacter. Good for knockback, bouncing, jumppads.

Melee attack with sphere trace and damage in front of character

Pattern: Attack input → Branch(bCanAttack) → PlayMontage(AttackMontage) → SET bCanAttack=false. AnimNotify during montage: GetActorLocation + GetActorForwardVector*AttackRange → SphereTraceMulti(Loc, Loc+Forward*Range, AttackRadius) → ForEach hit: Branch(HitActor != Self AND not already hit) → ApplyDamage(HitActor, Damage). OnMontageEnded → SET bCanAttack=true.

Projectile actor that moves forward and deals damage on hit

Pattern: BP_Projectile with SphereCollision(root), StaticMesh, ProjectileMovementComponent(InitialSpeed=3000, MaxSpeed=3000, bRotationFollowsVelocity=true). OnComponentHit → ApplyDamage(OtherActor, Damage, GetInstigatorController, Self) → SpawnEmitterAtLocation(ImpactPoint) → DestroyActor. Spawner: SpawnActorFromClass(BP_Projectile, MuzzleLocation, MuzzleRotation).

ActorHasTag — check if actor has a specific tag

Pure node. Tags are added in the Actor Details panel → Tags array. Case-sensitive.

ActorHasTag — check if actor has a specific tag

SpawnEmitterAtLocation — spawn a legacy Cascade particle system

Legacy Cascade system. Prefer Niagara (SpawnSystemAtLocation) for new projects.

SpawnSystemAtLocation — spawn a Niagara/Cascade particle system

UNiagaraFunctionLibrary::SpawnSystemAtLocation. bAutoDestroy=true for fire-and-forget. Use SpawnSystemAttached to attach to a component.

SetLifeSpan — set actor lifetime before auto-destroy

0 = live forever.

Variable names in connections must match exactly (case-sensitive)

When connecting GetVariable or SetVariable nodes, the pin name must exactly match the variable_name field. E.g. variable 'MyHealth' → pin name 'MyHealth'. SetVariable exec input pin is always 'execute', not 'Execute' or 'in'. GetVariable has no exec pins — it is a pure data node.