第一步是定义一个对象模型，用来描述所有表单功能需要的场景。
The next step is to define an object model that can describe all scenarios needed by the form functionality.
建立合理的三维地形模型，对于实现实时绘制虚拟地形场景，逼真模拟地形环境，实现虚拟地形环境中的分析功能及其它相关控制有着重要的意义。
It is significant to construct a suitable terrain model for real-time rendering terrain scene, simulating terrain environment in reality and achieving analysis functionality in VTE.
新版的存储功能可保存所有设置为单独的一个场景文件，这就意味着不用在担心模型和贴图的丢失了，简单的按下保存按钮就搞定了。
All objects and settings are now saved in a centralized scene file, no need to worry about saving meshes or materials separately, one nice big save button for everything!
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