(自定义指针轨迹)：可以在这里设置一个自定义的游戏对象用来代替光束轨迹的默认球体。
Custom Pointer tracer: a custom Game Object can be applied here to use instead of the default sphere for the beam tracer.
它们使用轨迹球移动指针和滚动屏幕，但是这更像是指针-键功能而不是鼠标指针。
They use a trackball to move the cursor and scroll the screen, but it is more like cursor-key functionality rather than a mouse pointer.
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