Bruno Postle wrote:
On 11 March 2010 15:45, Simon Oosthoek <[email protected]> wrote:
the more I think about it, the more I think this is really a bug and UNDO is
not the right way to fix it. The projections shouldn't fundamentally change
properties like FoV
Some projections have limits on field of view, switching from a 360deg
equirectangular to rectilinear has to reduce the field of view to less
than 180deg, if you then immediately switch back then you end up with
a 179deg equirectangular.
The General Pannini projection has a variable maximum angle of view,
so playing with pannini settings can (sometimes) result in the angle
of view reducing.
I suppose that from a mathematical perspective, you're correct and what
is happening isn't a bug, but from a user's perspective the behaviour is
seriously broken ;-)
Is it possible to change the behaviour so that from a user's visual
perspective the projections are still recognisable, but correct in terms
of the projection chosen? Some projections may not work (well) with some
sets of images (e.g. not 360x180), but whenever switching projections,
the new projection should not set values for FOV that are visually not
possible with the current image-set.
Of course, I now understand, this is not the same problem as the
fit/center/straighten options, because they really shouldn't have effect
on the FoV so that the image becomes totally distorted. (or is this also
explainable from the mathematical back-end?)
Cheers
Simon
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