That was a great explanation.
Is there a reason to use spheres over cubes though? Spheres are of course more polys than cubes. It probably doesn’t matter as much nowadays, even on mobile, but a part of me wants to keep things as efficient as possible, and I’m not sure what benefits are.
Seems like your instructions work equally well for any mesh type.
Also, if you make material be unlit, then shouldn’t it make no difference whether you make texture emissive or just diffuse?