Visibility: it should be easy for authorized users to view both the customization points (i.e. which parts of the application can be customized) and the values assigned to them in a given environment.
可视化：便于授权用户查看特定部署环境上的定制项(应用程序中可定制的部分)和赋给这些定制项的值。
According to this difficulty, a kind of fast calculation method of satellite orbit-extract the orbits control points is put forward, and perspective frustum is combined to judge the orbits visibility.
针对这一难点，提出了一种卫星轨道快速计算的方法-提取轨道的控制点，结合透视裁剪体来判断轨道的可见性。
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