Enblend-Enfuse Zenith/Nadir and more
Blending of the zenith and nadir in Enblend and Enfuse
The best way to do this would probably be to use a cubic projection and provide all cube faces to the tool simultaneously. All of the boundaries will be horizontal or vertical lines, which will fit in well with the SKIPSM-based pyramid algorithms currently in use. Enblend and Enfuse can share the same pyramid code.
Enblend would additionally need a nearest feature transform algorithm that works on the cube surface for mask generation. We are not aware of a published algorithm to solve this.
Currently enblend-enfuse is not aware of the zenith/nadir seam in full spherical images. This sometimes results in star-like artifacts. Strategies have been devised to come around that limitation, such as re-projecting the concerned areas, blending them and merging them back. It would be nice if the code could do this automatically.
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