I have thought about doing stuff like that in the past - projecting video on the wall for atmospheric effect. Instead of clouds I’ve wished to be able to project stars in a dark room. I’ve looked into all the star projectors on the market, but most use laser grids which look super fake due to recognizable grid patterns.
I don’t necessarily have any solution to offer, just a friendly reply.
I use Shotcut for a semi-similar reason. I’m willing to put in the time to learn DaVinci Resolve, and I use it for some things… but my primary output is 360 video at 5.7K resolution - 5760x2880. The free version of DaVinci Resolve maxes out at 4K resolution, and I don’t want to downscale my footage. I’m not sure what the upper limit is for Shotcut, if there is one. Editing crazy high resolution video is pretty slow though.
How are you planning to get footage that is smoothly stitched at that high of resolution? Are you planning to generate artificial clouds via some software, or do you have huge footage already?
A high resolution 360 camera would be able to capture actual clouds in a panoramic field of view. There are 360 cameras that capture 8K or even 12K video… but I doubt you want to invest in something like that.
Someday I’d like to play around with time lapses with my 360 camera, as the clouds in my videos often look cool over time as they roll across the sky. It’s hard to get high enough above land obstructions to get a really immersive sky recording though - without something like a drone.
Seems like Shotcut can probably do what you need, but the bigger issue might be deciding how to generate super wide cloud footage if you don’t have some to work with already. If you don’t need it to look super realistic you could simply scroll a large textured image like a fractal noise generator or something like that.
I suppose since you are working with projected light, you could have a gradient to black in the 3 overlapping areas, and the light would blend them together on the wall, so the 3 sky projections wouldn’t necessarily have to match perfectly in that sense, depending on how realistic you want it to look. You could even animate the border between the clouds so it’s not an obvious linear gradient.
Software that could generate artificial scrolling clouds for free is Blender. But that’s even harder to learn than DaVinci Resolve in my opinion!