Ralph Muench wrote:
> Furthermore, I would like to add that it will not even work for
[...]

  I think you are going the hard way... I prefer to think that up and right 
have nothing to do at all with camera position or direction, but rather 
with the "film" or "visualization window" size. I prefer to have it fixed 
at the default orientation, only sizing them for ratio purposes, and then  
using only location, direction (some prefer angle) and look_at to control 
the camera. It's much more easy this way for me, but I rarely need to 
accurately positioning the camera, tough.

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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