This is awesome. I see that this is GPL and open on GitHub. Thank you for sharing. If you are open to feature requests that I am too lazy and stupid to accomplish on my own, I would appreciate the option to drop the multi camera view and the option to capture a photo. Also plus one to the idea of being able to pin the black hold to a specific orientation so you can see what it looks like to pan around an object adjacent to the black hole.

Adding options to drop the multi-camera view and to capture a screenshot is relatively straightforward, and I think we can implement that in the next update. Pinning the black hole to a specific place is a whole other undertaking...