The second parameter is the scene node, which is the object, which is affected by collision detection, in our case it is the camera.
第二个参数是场景结点，指定受碰撞检测影响的对象，在我们的例子中就是相机。
The User track node can be used to manually generate trackers to use for camera or object solving, and can have multiple inputs and outputs.
用户跟踪节点可以用来手动生成跟踪器给照相机使用或物体解算，可以有多个输入和输出。
The auto track node can be used to automatically generate trackers to use for camera or object solving, and has a single input and output.
自动跟踪节点可用于自动生成跟踪点用于相机或对象的结算，并且有一个单一的输入和输出。
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