title: Show THREE.Group() if radio button is checked?
body: <p>What I want to do is showing a group if a certain radio button is checked.
  How can I achieve this?</p>
  
  <pre><code> &lt;input id="option1" type="radio" name="options" value="" checked="checked"/&gt;
   &lt;input id="option2" type="radio" name="options" value="" /&gt;   
  </code></pre>
  
  <p><strong>Load "groupA" if radio-button "option1" is checked</strong></p>
  
  <pre><code>var groupA = new THREE.Group();
  
    // Basis
     loader.load('/models/model1.js', function(geometry){
         var mesh = new THREE.Mesh(geometry, material);
         loadJson(mesh);
     });
      function loadJson(mesh){
          groupA.add(mesh);
      }
  
  
    // Basis
     loader.load('/models/model2.js', function(geometry){
         var mesh = new THREE.Mesh(geometry, material);
         loadJson(mesh);
     });
      function loadJson(mesh){
          groupA.add(mesh);
      }
  
  scene.add( groupA );
  </code></pre>
  
  <p><strong>Load "groupB" if radio-button "option2" is checked</strong></p>
  
  <pre><code>var groupB = new THREE.Group();
  
    // Basis
     loader.load('/models/model1.js', function(geometry){
         var mesh = new THREE.Mesh(geometry, material);
         loadJson(mesh);
     });
      function loadJson(mesh){
          group.add(mesh);
      }
  
  
    // Basis
     loader.load('/models/model2.js', function(geometry){
         var mesh = new THREE.Mesh(geometry, material);
         loadJson(mesh);
     });
      function loadJson(mesh){
          groupB.add(mesh);
      }
  
  scene.add( groupB );
  </code></pre>
  
  <p>Thank you very much in advance!</p>