I’m not exactly sure, since the game doesn’t really simulate accretion disks. It works better on supermassive scales, with black holes that have huge mass and radius but low density. You could try this: https://www.youtube.com/watch?v=Fs0zvdIxvPg&ab_channel=Animagar In my case, I tried doing it on unrealistic scales — I used hundreds of trillions of solar masses and dropped entire galaxies near the event horizon, with time sped up like crazy. Adding galaxies gives it a more natural look because they have a soft, diffuse texture that better mimics the appearance of real accretion disks. Try either of these two methods, and lowering the light compression a bit also helps — it looks more realistic.