(void)viewWillAppear:(BOOL)animated{

    isbtn_Paused = true;


    _scnView.scene = [SCNScene sceneNamed:@"sample"];
    _scnView.allowsCameraControl = YES;

    _scnView.autoenablesDefaultLighting = YES;
    _scnView.backgroundColor = [UIColor whiteColor];

    printf("%f",_scnView.sceneTime);
    _scnView.loops = NO;


}