Mandelbulb 3D v1.7.9
Thought I'd try the new 'Blend Dynamic Fog' function on one
of my favourite formula combos; SierpHilbert and reciprocalX2,
in inside+outside mode.
The results can be quite similar to the 'glow' function in Mandelbulber.
I've found that a RSM of 0.5 gives the best result,
but can lead to some undersampling.