Create scene object. Scene is a container which have everything else inside.
建立场景对象，它是里面一切对象的容器。
To begin we choose a point on the most distant object in the scene.
一开始我们选择场景中最远的物体上的一点。
The size of the focal object in the scene is important.
一个场景的中心物体的尺寸是很重要的。
You might imagine this scene as a television (the object) with your remote control (the reference).
可将这一情形想象成用遥控板（句柄）操纵电视机（对象）。
The tools will be usable on any object in your scene.
这些工具可以用于场景中任何物体。
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。
Keep Your distance: how to scale a scene to match a camera to object distance you have been given.
保持距离：如何缩放场景相匹配的相机，您已获得物体的距离。
Start with default scene with a cube object.
用一个立方体物体从默认场景开始。
Start with default scene with a cube object.
用一个立方体物体从默认场景开始。
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