code: function PointLight(name, position, scene) {
              var _this = _super.call(this, name, scene) || this;
              _this._shadowAngle = Math.PI / 2;
              _this.position = position;
              return _this;
          }
docs: Creates a PointLight object from the passed name and position (Vector3) and adds it in the scene.
  A PointLight emits the light in every direction.
  It can cast shadows.
  If the scene camera is already defined and you want to set your PointLight at the camera position, just set it :
  ```javascript
  var pointLight = new BABYLON.PointLight("pl", camera.position, scene);
  ```
  Documentation : http://doc.babylonjs.com/tutorials/lights