static [TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) > GetGraphOutputNodeVariables ( const [FGraph](API\Plugins\NiagaraEditor\FNiagaraCompilationGraphBridge\FGraph) * Graph, [ENiagaraScriptUsage](API\Plugins\Niagara\ENiagaraScriptUsage) Usage )