I wrote a camera system up. Here's the wiki page with some code. The idea is that all the information on how to set up a camera right before render is in the Camera class.
You can make different camera classes for different view modes, for example a FirstPerson mode and a ThirdPerson mode. So switching camera mode is just a case of setting the player's Camera class to one of these modes.
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The above demonstrates three camera modes. Third person, First Person and a DevCam mode (in which you can move around freely, even when paused).
