The back clipping plane determines the cutoff point for rendering polygons. Here we're setting it to 5000. This value will vary depending on your coordinate system.
背景剪裁平面决定了展现多边形时剪裁的点数，在这里我们设定的值是5000，这个值取决于您使用的坐标系。
In this article, the kinematic and dynamic methods for setting up the inertial coordinate system are simply described.
本文简述了建立惯性坐标系的运动学方法和动力学方法。
From the viewpoint of relative motion, often it is easier and clearer td solve problems about kinematics and dynamics in the method of setting up coordinate system of motion.
用相对运动的观点，建立运动坐标系，来解运动学和动力学的问题比较明晰简便。
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