History: Documentation Architecture

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!!High level overview
{img src="img/wiki_up/Root_managers.png" alt="Class diagram showing Root and Manager classes"}

The class diagram shows the Root class of OGRE and all of the Manager classes that gives access to the different subsystems.

* The Root holds a reference to the current SceneManager and to an enumerator that allows other types of scene graphs to be loaded.

* The RenderSystem is an abstract class that separates the Root from the specific implemention of the RenderSystem, OpenGL or Direct3D.

* The ResourceManager is an abstract class that is subclassed by a number of managers that handles resources such as textures, materials and fonts.

* All of the classes in the diagram except for RenderSystem, SceneManager and RenderWindow are using a singleton template to ensure that there is only one instance of each class.

!!The render cycle
{img src="img/wiki_up/RenderOneFrame.png" alt="Sequence diagram showing the rendering of one frame"}