static bool GetStaticSwitchExpressionValue ( [UMaterialInstance](API\Runtime\Engine\Materials\UMaterialInstance) * MaterialInstance, [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * SwitchValueExpression, bool & OutValue, [FGuid](API\Runtime\Core\Misc\FGuid) & OutExpressionID, [TArray](API\Runtime\Core\Containers\TArray)< [FGetVisibleMaterialParametersFunctionState](API\Editor\MaterialEditor\FGetVisibleMaterialParametersFun-) * > & FunctionStack )