Mandelbox

A "scale-2" Mandelbox

A "scale-3" Mandelbox

In mathematics, the mandelbox is a fractal with a boxlike shape found by Tom Lowe in 2010. It is defined in a similar way to the famous Mandelbrot set as the values of a parameter such that the origin does not escape to infinity under iteration of certain geometrical transformations. The mandelbox is defined as a map of continuous Julia sets, but, unlike the Mandelbrot set, can be defined in any number of dimensions.^[1] It is typically drawn in three dimensions for illustrative purposes.^[2][3]

Simple definition[]

The simple definition of the mandelbox is, for a vector z, for each component in z (which corresponds to a dimension), if the absolute value of the component is greater than 1, subtract it from either 2 or −2, depending on the z. (Please simplify.)

Generation[]

The iteration applies to vector z as follows:

function iterate(z):
    for each component in z:
        if component > 1:
            component := 2 - component
        else if component < -1:
            component := -2 - component

    if magnitude of z < 0.5:
        z := z * 4
    else if magnitude of z < 1:
        z := z / (magnitude of z)^2
   
    z := scale * z + c

Here, c is the constant being tested, and scale is a real number.^[3]

Properties[]

A notable property of the mandelbox, particularly for scale −1.5, is that it contains approximations of many well known fractals within it.^[4][5][6]

For ${\displaystyle 1<|{\text{scale}}|<2}$ the mandelbox contains a solid core. Consequently, its fractal dimension is 3, or n when generalised to n dimensions.^[7]

For ${\displaystyle {\text{scale}}<-1}$ the mandelbox sides have length 4 and for ${\displaystyle 1<{\text{scale}}\leq 4{\sqrt {n}}+1}$ they have length ${\displaystyle 4\cdot {\frac {{\text{scale}}+1}{{\text{scale}}-1}}}$.^[7]

See also[]

• Mandelbulb

References[]

External links[]

Wikimedia Commons has media related to Mandelboxes.

• Gallery and description
• Images of some Mandelbox cubes
• Video : zoom in the Mandelbox cube

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