Le 18/12/2012 08:38, MichaelJF a écrit :
> "Cousin Ricky" <rickysttATyahooDOTcom> wrote:
>> Sam's illustration conveys the camera much better than the existing diagram in
>> the docs, although Sam's illustration doesn't have a place for the angle.
> 
> Yes, indeed. But for a documentation or tutorial it needs more explanation (e.g.
> meaning of up and right). The problem with writing a doc or tut is, that one has
> to know which parameters are used by a special type of camera and which are not.
> Angle seems to make no sense, but is it ignored completelly when specified in
> the orthographic camera?

No, it is not ignored. Thanks to "upward compatibility", when angle is
specified, it change the specification of the orthographic camera to
have a view similar to the one with the perspective camera (it ignore
then the length of the right & up vector to define the area of the image
plane, and recompute them based on angle & direction & the ratio between
up and right... because angle only apply to the width of the picture).

And yet, when angle is not present, the actual lengths of right & up are
very significant, whereas the length of direction is not!

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