title: why the object gives "Uncaught TypeError: Converting circular structure to JSON"
body: <p>here    is    my    object    with    sample    data</p>
  
  <pre><code>Object {map: Array[10], health: 100, ai: Array[4]}
  ai: Array[4]
  0: THREE.Object3D
  1: THREE.Object3D
  2: THREE.Object3D
  3: THREE.Object3D
  length: 4
  __proto__: Array[0]
  health: 100
  map: Array[10]
  </code></pre>
  
  <p>not    able    to    find out   why   it    gives   this    error.. anyone help??</p>