Projection issues with stereo 180° panoramas

[niveuseverto]

Greetings, There is projection issue with stereo 180° panoramic videos.

Dirty hack - is to recode with "fake" other hemisphere.
Checked code and didn't manage to find where sphere projection is taking it own business.

If you point me there, I'll try to make pr.

[gkv311]

There is no support for 180 degrees panoramas, only for 360 degrees.
StGLWidgets/StGLImageRegion.cpp manages image rendering, and there is also StPanorama enumeration (include/StImage/StImage.h) which is used in several places to define which panorama type is in the frame.

[niveuseverto]

Thank you, Will try to implement 180° logic.

[niveuseverto]

Here WIP variant: #34

[gkv311]

Hemisphere projection mode has been implemented by 1e5af2d
Please re-open / create new issue in case if it does not work as expected.