Set root object for scene hierarchy. Root object coordinate system becomes scene global coordinate system.
为阶层式场景设置根对象，根对象的坐标系会成为场景全局坐标系。
The method is based on the plane calibration object and need only one coordinate system.
该算法是基于平面定标物体上，且只需一个坐标系统。
The method is based on the plane calibration object and need only one coordinate system.
该算法是基于平面定标物体上，且只需一个坐标系统。
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