These videos explore some amazing 3d fractal worlds. Take a look, and turn the volume up!

The Mandelbulb is a three-dimensional analogue of the Mandelbrot set, constructed by Daniel White and Paul Nylander usingspherical coordinates in 2009.[1]

A canonical 3-dimensional Mandelbrot set does not exist, since there is no 3-dimensional analogue of the 2-dimensional space of complex numbers. It is possible to construct Mandelbrot sets in 4 dimensions using quaternions. However, this set does not exhibit detail at all scales like the 2D Mandelbrot set does.

White and Nylander’s formula for the “nth power” of the 3D vector $\langle x, y, z\rangle$ is

$\langle x, y, z\rangle^n = r^n\langle\sin(n\theta)\cos(n\phi),\sin(n\theta)\sin(n\phi),\cos(n\theta)\rangle$

where $r=\sqrt{x^2+y^2+z^2}$, $\phi=\arctan(y/x)=\arg (x+yi)$, and $\theta=\arctan(\sqrt{x^2+y^2}/z)=\arccos(z/r)$.

They use the iteration $z\mapsto z^n+c$ where $z^n$ is defined as above and $a+b$ is a vector addition.[2] For n > 3, the result is a 3-dimensional bulb-like structure with fractal surface detail and a number of “lobes” controlled by the parameter n. Many of their graphic renderings use n = 8. The equations can be simplified into rational polynomials for every odd n, so it has been speculated by some[who?] that odd-numbered powers are more elegant. For example n = 3 is simplified to:

$\langle x, y, z\rangle^3 = \left\langle\ \frac{(3z^2-x^2-y^2)x(x^2-3y^2)}{x^2+y^2} ,\frac{(3z^2-x^2-y^2)y(3x^2-y^2)}{x^2+y^2},z(z^2-3x^2-3y^2)\right\rangle$
(wikipedia)

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