Thorsten Froehlich wrote:

>>This *DID* work always.
> 
> No, the example you are quoting never worked.  When look_at was applied
> POV-Ray always made the up and right vectors perpendicular.  If you didn't
> want perpendicular up and right vectors, you could not use look_at.  The same
> is still true in POV-Ray 3.5.
> 

Thanks, I overlooked the "look_at".
I never used look_at when generating stereo pairs.

But if we omit look_at, we can use non-perpendicular right and
direction vectors, is this correct?

If this were correct, the mentioned problem could be solved this way,
without the need of a matrix transform.
Of course it is inconvienient to set up the camera without look_at,
but one could write a macro for this.

Hermann

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