(指针密度)：贝塞尔曲线光束渲染的物体个数。
Pointer Density: the number of items to render in the beam bezier curve.
当液压杆往上或往下移动而且无压住任何物体时压力表指针不会显示。
When the hydraulic pole move up or down and without compressing anything then the index of pressure meter without showing the pressure.
当液压杆往上或往下移动而且无压住任何物体时压力表指针不会显示。
When the hydraulic pole move up or down and without compressing anything then the index of pressure meter without showing the pressure.
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