Le 04/09/2013 14:23, timer nous fit lire :
> 
> Hi,
> 
> I write a code with a camera to simulate a specific camera/objectiv combination.
> If I use the angle with the value of the angle of view value of the objectiv the
> simulated image looks the same as the real view throuw the objective. But if I
> use the direction vector with the focal length ob the objective it absolutely
> does not.
> 
> Isn't it that the length of the direction vector is the same as the focal length
> of the objective?

First, it depends on the type of camera to take into account or not the
length of the direction vector, and usually it's a ratio with the
other(s) vector(s) (up/right)

Second, not at all.

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