Based on the hunch that just green channel works like Normal map, I deleted other channels and reloaded it in Blender to export to MSFS. Now, it did not fix the problem in MSFS, but in Blender the hangar sudennly looked the same weird way as in MSFS! It means that whatever is happening in MSFS it only gets a single channel, or not all channels of a Normal map. Because with missing RGB channels the look in Blender is exactly the same! It means MSFS is NOT reading the purple normal map correctly. Something else has to be done! Now, how can I figure out what???
