        groupLayer.setSceneConfig(sceneConfig);
      });


      var ssaoConfig = sceneConfig.postProcess.ssao;
      var ssao = gui.addFolder('ssao');
      ssao.open();
      var biasCtrl = ssao.add(ssaoConfig, 'bias', 0.001, 0.2, 0.0001);
      var radiusCtrl = ssao.add(ssaoConfig, 'radius', 0.01, 0.2, 0.001);
      var intensityCtrl = ssao.add(ssaoConfig, 'intensity', 0.01, 2, 0.01);
      function onChange() {
        groupLayer.setSceneConfig(sceneConfig);
      }
      biasCtrl.onChange(onChange);
 