code: function CubeTile(face, x, y, z, geometry) {
    this.face = face;
    this.x = x;
    this.y = y;
    this.z = z;
    this._geometry = geometry;
    this._level = geometry.levelList[z];
  }
docs: @class CubeTile
  @implements Tile
  @classdesc
  
  A tile in a @{CubeGeometry}.