[gameprogrammer] placing an object behind another

Im trying to implement two view modes in my game, a primary isometric like view and an optional 3rd person view. Im using ogre, which represents the node orientation as a quaternion. I want to place the camera node behind the character node, but I dont know how to calculate what is "bahind". According to a reply in Ogre forums I must use the inverse of the direction vector, but there is no way to get the direction, as I said Ogre just provides node orientation as a Quaternion. 
Can somebody give me an idea?

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Silvanus P. Thompson
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