[Axiom 3D]3.SceneManager场景管理器

首先看看Axiom.Core命名空间下public abstract class SceneManager : DisposableObject

　　A SceneManager organizes the culling and rendering of the scene, in conjunction with the <see cref="RenderQueue"/>.

　　This class is designed to be extended through subclassing in order to provide more specialized scene organization structures for particular needs.

　　通过子类继承来实现更多特定的场景组织。

　　The default SceneManager culls based on a hierarchy of node bounding boxes, other implementations can use an octree (<see name="OctreeSceneManager"/>), a BSP tree (<see name="BspSceneManager"/>,二叉树), and many other options.

　　默认的场景管理器剔除是通过层次节点包围盒，其他的还有八叉树和二叉树，还可以自己实现其他的选择。

　　New SceneManager implementations can be added at runtime by plugins, see <see cref="SceneManagerEnumerator"/>for the interfaces for adding new SceneManager types.