There are some nice somewhat interactive black hole renderings on shadertoy... https://www.shadertoy.com/results?query=black+hole https://www.shadertoy.com/res

There are some nice somewhat interactive black hole renderings on shadertoy... https://www.shadertoy.com/results?query=black+hole https://www.shadertoy.com/results?query=black+hole https://www.shadertoy.com/view/XdjXDy https://www.shadertoy.com/view/XdjXDy