學習如何加載3D世界從一個數據文件，並通過3D世界。他的代碼是使用第一課的代碼，但是，教程網頁只解釋了新的代碼用來加載三維場景，並四處移動在3D世界。-Learn how to load the 3D world from a data file, and through the 3D world. His code is to use the first lesson of the code, but only tutorial page to explain the new code used to load three-dimensional scene, and move around in the 3D world.