"Geodes" - 3D Julia set fractals

Some cubic quaternions Julia sets, cut in half so we can see their beautiful interior.
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You can buy a metal print of one of the fractals in this video here: https://www.redbubble.com/i/metal-pri...

Tutorials on maths, fractals, art and computer graphics: http://iquilezles.org
Distance to the M/J set: https://iquilezles.org/articles/dista...
Orbit Trapping in 3D: https://iquilezles.org/articles/orbit...
Orbit Trapping in 2D: https://iquilezles.org/articles/ftrap...
Rendering 3D julia set: https://iquilezles.org/articles/julia...

Source code for the intro fractals:
3D: https://www.shadertoy.com/view/3tsyzl
2D: https://www.shadertoy.com/view/3llyzl