[Kde-imaging] [kipiplugins] [Bug 346053] Add PhotoSphere projection support (EquiRectangular)

[Benjamin Girault]

https://bugs.kde.org/show_bug.cgi?id=346053

--- Comment #12 from Benjamin Girault <benjamin.girault at nebux.org> ---
Alan: I've looked at the Google's page. Photo Sphere seems to be the Android
app to generate panoramas. So maybe a title like "Google Photo Sphere
panorama", without the "XMP metadata" since the panorama projection has to be
set accordingly (and maybe the output should be a JPEG)?

Gilles: The projection is one thing, but not the only possible culprit. Have
you checked the projection in the pto files like I suggested? Also, it seems
that Hugin is setting the Exif tag "User Comment" with the projection (among
other informations). That may be quicker to determine if the projection is
indeed the culprit.

I somehow doubt that a very mature piece of software like Hugin generates a not
"real equirectangular projection", especially for such a basic projection.
Either your photos are not stitched correctly (for example because of parallax
errors from the photo shoot), or the 3D viewer does not understand correctly
how to map the pixels in the space (the most likely scenario).

My strongest suspect at the moment is the field of view, rather than the
projection. Google's 3D viewer assume by default that the FOV is 360x180. That
means that the projection is a rectangle and the horizontal span is 360° and
the vertical span 180°. If it's not, the 3D viewer tries anyway and the
panorama does not show correctly. In that case, several key XMP fields have to
be set with the correct panorama size (it were a 360x180), FOV, and crop (at
least). This is the complex part of setting the Show Photo XMP metadata
correctly, and maybe the reason I deactivated the code (I slowly begin to
remember the complexity of the task).

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