Niagara particle effect at impact point from line trace

Pattern: LineTraceByChannel → Branch(hit=true) → BreakHitResult → SpawnSystemAtLocation(SystemTemplate=NS_Impact, Location=ImpactPoint, Rotation=MakeRotFromX(ImpactNormal), Scale=(1,1,1), bAutoDestroy=true). Use MakeRotFromX with ImpactNormal to orient effect to surface normal. NS_ prefix is convention for Niagara Systems. SpawnSystemAtLocation is in UNiagaraFunctionLibrary. bAutoDestroy=true means the component cleans itself up after the effect completes.

SpawnSystem call references a deleted Niagara System

Why: Your spawn-system node points at the Niagara asset '{sys}' which no longer exists in the project. Fix: In Content Browser, search for Niagara assets to confirm whether '{sys}' is missing. If you can rename: drag the actual existing system onto the node's pin. If missing entirely: replace the call with a different VFX or temporarily disconnect until you create the system.

SpawnSystemAtLocation — spawn Niagara particle system at location

UNiagaraFunctionLibrary::SpawnSystemAtLocation.

SpawnEmitterAtLocation — spawn a legacy Cascade particle system

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

SpawnEmitterAtLocation — spawn particle effect at world location

UGameplayStatics::SpawnEmitterAtLocation. For Niagara, use SpawnSystemAtLocation.

SpawnSystemAtLocation — spawn a Niagara/Cascade particle system

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

IsInAir (IsFalling) — true if character is in the air

Call on the CharacterMovementComponent, not directly on Character. Or use IsMovingOnGround.

Less (float) — A < B

Execution flow has a broken / missing wire

Why: An execution pin (the white triangle pins, not data pins) has no wire feeding into or out of it. UE5 can't determine when this node should run. Fix: Click and drag from the white-triangle exec OUTPUT of one node to the white-triangle exec INPUT of the next. Every node in an execution sequence must be chained — orphan nodes are silently skipped (warnings) or crash compile (errors).

Branch node pin reference — Condition True False

Internal pin names: True path is 'then', False path is 'else'. Display names show True/False.