function Skin() {
  /**
   * The index of the skin in the glTF. This is useful for finding the skin
   * that applies to a node after the skin is instantiated at runtime.
   *
   * @type {number}
   * @private
   */
  this.index = undefined;

  /**
   * The joints.
   *
   * @type {ModelComponents.Node[]}
   * @private
   */
  this.joints = [];

  /**
   * The inverse bind matrices of the joints.
   *
   * @type {Matrix4[]}
   * @private
   */
  this.inverseBindMatrices = [];
}
Joints and matrices defining a skin.

@alias ModelComponents.Skin
@constructor

@private