text: function UpdatePosition(x, y, size) {
      this.x = x;
      this.y = y;
      this.size = size;
  }
  
  module.exports = UpdatePosition;
  
  UpdatePosition.prototype.build = function() {
      var buf = new ArrayBuffer(13);
      var view = new DataView(buf);
  
      view.setUint8(0, 17, true);
      view.setFloat32(1, this.x, true);
      view.setFloat32(5, this.y, true);
      view.setFloat32(9, this.size, true);
  
      return buf;
  };
  