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You must multiply by the focal length in order to preserve the desired viewing angle. |
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Anyone explain to me why, in the section Positionable Camera, we have in the code
auto viewport_height = 2 * h * focal_length;
In particular, why do we multiply focal_lenght? I am sure it is important to have a viewport dimension that depends on focal_lenght , but I cannot realize the modelling rationale.
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