code: function HandMesh(options) {
      this.options = options = Object.assign({}, DEFAULTS, options || {});
      this.options.jointColor = this.options.jointColor || JOINT_COLORS[numInstances % 2];
      this.object3D = new THREE.Object3D();
      this.material = !isNaN(options.opacity) ? new THREE.MeshPhongMaterial({
        fog: false,
        transparent: true,
        opacity: options.opacity
      }) : new THREE.MeshPhongMaterial({fog: false});
  
      this.createFingers();
      this.createArm();
      numInstances++;
    }
docs: Wrapper for a THREE.Mesh instance fitted to a single Leap Motion hand.
  @param {Object} options