Very helpful, thanks! The in-build GDevelop cube map have so exotic and twisted coordinates, it's like build terrible on purpose lol. The set up with https://matheowis.github.io/HDRI-to-CubeMap/ is still far from perfect because I need to export bigger map 12288 x 2048, then cut it x6, and then resize each map to 512x512. If I export straight 512x512 from matheowis's tool, the result is jagged pixels.
Amazing... But lacks some common sky layouts that exist here: https://matheowis.github.io/HDRI-to-CubeMap/ and sadly the tool of matheows although it have the specific sky layout that I need (the second one), it export it merged, not in slices XD, and even worse, it produces some jaged artifacts... (yours doesn't) So I have to manually cut and rotate. If you can expand the layouts or make some custom export layout option would be very helpful...
