对象节点在场景中描述物体，例如角色部分，几何体物体，灯光和摄像机等等。
Object nodes represent objects in the scene, such as character parts, geometry objects, lights, cameras, and so on.
节点控制几何体的形态。
材质节点使材料生效看起来像你涂抹到几何体。
Shader nodes implement material looks that you can apply to geometry.
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