Please refer to the discussion at povray.general.


The perspective "trick" is very useful when, for example, you try to 
take a photograph of a building.

1. If you level your camera and point it straight forward, you might not 
see the top portion of the building.

2. If you point the camera upwards, the building does not look 
rectangular anymore: all the lines start to "converge".

3. If you level your camera, point it straight forward (as in no 1.), 
and shift the film lower (maintaining the alignment so that the lens 
axis being a normal) in relation to the lens, you will see the whole 
building with straigh walls that do not converge.

These are all rendered so that the camera is allways at the same spot.

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