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Currently, when pausing a new synth's slideshow, the viewport is fitted to the orientation of the photo paused at (in older Photosynth terms "Photo Up".
I can understand that this is to present the entire photo without having artifacts from filling in the corners of empty space that the photo is rotated out of, but it makes stopping and starting a tour/slideshow back up very jarring when the input photos have a bit of tilt to them.
Could you explain the reasons why this is currently the way it is?
Even if you have your reasons, would you please consider an option to keep the viewport oriented to "World Up"?
I realized later that this might be primarily because you are using OpenSeadragon to do the zooming into full resolution photos and OpenSeadragon currently only works in 2D.
I already requested 3D support from them eight months ago https://github.com/openseadragon/openseadragon/issues/68 but is there really no way to rotate whatever surface OpenSeadragon is drawing onto to keep the images oriented 'World Up' at all times (unless specified by the user) without noticeably losing any performance?
Openseadragon is indeed used to display seadragon HD image on a separate 2d canvas displayed on top of the webgl one. We would had to rotate the Openseadragon by an arbitrary angle to compensate the roll angle of the camera and have the 'World Up' option you are requesting.