Acctretion disks update
I continuing work on new black holes. They now have accretion disks, and you can approach them up to the event horizon and see how Universe collapses into point above you.
These screenshots shows the accretion disk without Doppler and gravity redshift/blueshit effects.
The next screenshots are with redshift/blueshift effects, caused by gravity and Doppler (accretion disk rotates at speed ~0.6c, so showing strong Doppler shift). Notice how sky become more and more blue and bright. The skybox blueshift is fake, because the frame texture obviously doesn't have infrared data, but it looks very well. The sctrange buldge next to the sky circle in the last shot is a part of the accretion disk visible near the observer.