sajty/ember — comment on commit 73e5736005e157f4c9ce6102d3a923b03480cf68
File:  line 0
By erikhjortsberg:

I'm not saying that all Ember code is consistent. :)
This is something where you'll find older code which not always conform to what I've written above. As I alter the code I tend to try to update it to fit with the development practices I've settled on.
The main place where Ogre::Root is also used is as a field is in OgreSetup. In all other places we actually access it through the Singleton. This is ok since this is how Ogre is designed to work.
Those matches you've found are for other things which have mRoot in their names.