Remapped group (one image is masked):
https://www.dropbox.com/s/dp92f6thry8hiuq/builtin_softseam.JPG?dl=1
Separate images will be referred to as:
1, 2, 3,
4, 5, 6.

Enblend
https://www.dropbox.com/s/0pfxi7gkpidwap9/A3_exr_Enblend.JPG?dl=1

Enblend with NFT:
https://www.dropbox.com/s/behos2r38ru0vze/enblend_nft.JPG?dl=1

Builtin (Verdandi?) with hard seam setting:
https://www.dropbox.com/s/8h9saqgsem2obf8/builtin_hardseamfast.JPG?dl=1

Builtin (Verdandi?) with soft seam setting:
https://www.dropbox.com/s/dp92f6thry8hiuq/builtin_softseam.JPG?dl=1

As you can see all images seem to be projected to equirectangular and 
displaced properly.

I had all stacks combined into 32b hdr EXR files in Photoshop, and aligned 
in the process. I have noticed a small discrepancy in one of the stacks - 
guessing about 3-5 pixels of difference between the merged images.

It seems to me that one of the images is writen as transparency-only at the 
blending step before any actual blending or pixel interpolation happens.
I suspect that due to very high overlap between images 2 and 6 Hugin 
decides to remove one of them as a performance optimization attempt. 
https://www.dropbox.com/s/h5p69ocoyq2ztdc/layer_stitcherror.JPG?dl=1 was an 
interesting factor to consider as only one of the layers was broken, and if 
fixed a different layer would break.
Adding large inclusion and exclusion masks to the images in question had no 
effect, however. It is possible that this could be circumvented/hacked by 
overlapping various masks - because the opposite problem of actual black 
spots appearing where masks intersected.

I would like to request someone else attempt to build this panorama again. 
At the following wetransfer links I have uploaded the relevant files along 
with the project file for the TIF group. Due to their size the packages 
were split in two.

   1. 
   
https://wetransfer.com/downloads/feca2675739da2ee38c939e88a16250a20181212200354/bb2590f09141a3c9039719e205d59e4020181212200354/b3faf5
   2. 
   
https://wetransfer.com/downloads/61acae57b35b7f2bee1744f6363a7d5b20181212201526/a70a5f47e40e08d184de5f1d944c414420181212201526/e2a5ce

The EXR stacks are included. Two things are important to test: try to build 
a panorama from the included project file with the settings as they are, 
and then again with the EXR. There is no need for precision as the error 
should manifest in the same way it has so far - either one of the images 
will be obviously invisible and the panorama broken or it will be present 
in some capacity.

The first time I mentioned an issue with Hugin someone said that the error 
was not reproducible... I have noticed that my computers have some unique, 
endemic problems so it is possible that the reoccurring error is systemic 
on my end. If possible I would like someone to try to stitch this panorama 
and post their general method and result. My gear and method:

   - Samyang 8mm f/3.5 fisheye (old model)
   - Canon EOS 5D mark III full frame

For the method you can follow the aforementioned screencapture video from 
Dropbox. Otherwise:

   1. load directly into expert or advanced window
   2. stacks are detected, lens parameters set to: 8mm circular fisheye, 
   crop factor *(note: sometimes setting focal length to 8mm sets HFOV to 
   250° instead of 172 - cause unknown)*
   3. Set Crop on all images (a few pixels in from the edge) (for the EXR 
   stacks it is necessary to specify the lens as well)
   4. Control points, F3 & manually clean points with largest distance or 
   in low contrast areas etc,
   5. Everything except translation geometric optimisation
   6. HDR fixed exposure photometric optimisation
   7. stitcher to EXR hdr output, everything else is irrelevant on my 
   system.
   

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