code: function HandBody (el, handComponent) {
    this.el = el;
    this.handComponent = handComponent;
    this.system = this.el.sceneEl.systems.leap;
    this.physics = this.el.sceneEl.systems.physics;
    this.physics.addComponent(this);
  
    this.palmBody = /** @type {CANNON.Body} */ null;
    this.fingerBodies = /** @type {{string: CANNON.Body}} */ {};
  }
docs: CANNON body controller for a single Leap Motion hand.