What determines the aspect ratio and FOV of thumbnail images?
Thumbnail images are the same as preview images used in krpano. So for a spherical pano, FOV (vertical and horizontal) will be used to determine aspect ratio, in the case of a planar projection, the picture keep its original aspect ratio.
This is the good way if we don't want stretching of the pictures.
for example some spherical panos plus a number of partial panos each with a different pano FOV then the thumbnails will be of different sizes and aspect ratios - which is plainly unacceptable for a thumbnail bar for navigation. What plans are there to resolve this and how do you plan to resolve it?
This is normal behavior. How do you want to represent thumbnails of panos with different aspect ratio, with the same size and aspect ratio, without stretching the images? Of course we could stretch all thumbnails to the same normalized size, but that would be, IMO, visually unacceptable.
There is two ways to overcome the actual thumbnail size problem:
* The first one is to resize each thumbnail so it fit into an invisible container, each container having the same aspect ratio:
=>No more overlapping between thumbs
=>Aspect ratio of thumbs is kept
=>this is more or less the thumbnail preview in windows (and other OS) explorer.
* The second one is to crop some part of the panoramas preview so it fit some predefined dimension and aspect ratio
=>All thumbs have same aspect ratio and same size (hence an homogeneous view in thumbnail slide)
=>No difference between full 360 and partial pano
=>No visual indices on the panorama aspect ratio : not satisfying for users doing vertical panorama (and eventually mix them with classical panos in a visit)
=>Which part of the pano should we crop? (not really an issue but I put it)
You see I long for the first one, but I agree the second one has its pros.
So here you go to tell which one could satisfy to the more general cases. And let's focus on the one which should be implemented first. We know all solution should be proposed, but this is middle/long term.
Of course you can propose other way (for the actual thumbnail model, no caroussel or other sliding thumbnail like the krpano plugin).