I have used multiple cameras before for the GUI of a few games. It can lead to some really nice looking 3d GUIs, and is not that hard to implement.
Submitted by davids on Sun, 04/10/2011 - 16:10
Here is a three part video about doing some 2d in 3d techniques in Unity.
There is a huge amount of information.
For example, there is info about using multiple cameras, one for the scene and one for hud (heads up display).
Check it out.
- davids's blog
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