Close-up on a pseudo-octonionic Mandelbrot set (a 'Mandelbulb') transformed using the tridimensional life game -tridimensional cross-section- [Agrandissement d'un ensemble de Mandelbrot dans l'ensemble des pseudo-octonions (un 'Mandelbulb') transformé en utilisant le jeu de la vie tridimensionnel -section tridimensionnelle-].

This Mandelbrot set is a tridimensional cross-section and was computed with a polynomial 'P' of the first degree ('C' denoting the current octonionic point) and the following eight functions:
                    P(o) = 1*o + C
                    fR(R ,R ) = (R *R )
                        1  2      1  2
                    fA1(A1 ,A1 ) = 8*(A1 +A1 )
                          1   2         1   2
                    fA2(A2 ,A2 ) = 8*(A2 +A2 )
                          1   2         1   2
                    fA3(A3 ,A3 ) = 8*(A3 +A3 )
                          1   2         1   2
                    fA4(A4 ,A4 ) = 1*(A4 +A4 )
                          1   2         1   2
                    fA5(A5 ,A5 ) = 1*(A5 +A5 )
                          1   2         1   2
                    fA6(A6 ,A6 ) = 1*(A6 +A6 )
                          1   2         1   2
                    fA7(A7 ,A7 ) = 1*(A7 +A7 )
                          1   2         1   2

See the same object without the transformation:

The bidimensional life game was initially defined by Conway. It uses an empty square mesh (all vertices are turned off). At time t=0 some vertices are occupied (they are turned on): this is the initial state. To go from the time t to the time t+1, it suffices to count for each vertex -or "Cell"- C(x,y) the number N of its neighbours (it is less than or equal to 3^2-1=8) and then to possibly change the state of M according to the following bidimensional automata rules:
                    [R1 = Birth]        ((C(t) == 3))            ==> C(t+1) on
                    [R2 = Death]        ((C(t).IS.on).AND.((N < 2).OR.(N > 3))) ==> C(t+1) off
                    [R3]                other cases ==> C(t+1)=C(t)
The boundary conditions can be periodical or not.

This process can extended in a tridimensional space. The number N of neighbours of the vertex -or "Cell"- C(x,y,z) is computed (it is less than or equal to 3^3-1=26) and the preceding rules can be extended as follows:
                    [R1 = Birth]        ((C(t) >= NB1).AND.(N <= NB2))) ==> C(t+1) on
                    [R2 = Death]        ((C(t).IS.on).AND.((N < ND1).OR.(N > ND2)))     ==> C(t+1) off
                    [R3]                other cases ==> C(t+1)=C(t)
The bidimensional and tridimensional processes can be extended one step further using two binary lists 'LD' and 'LA' ("Dead" -off- and "Alive" -on- respectively):
                    [R1 = Birth]        ((C(t)[N] == 1))  ==>C(t+1)=on
                    [R2 = Death]        ((C(t).IS.on).AND.(LA[N] == 1))   ==>C(t+1)=off
                    [R3]                other cases ==> C(t+1)=C(t)
("1" means "to change the state" and "0" means "the state is unchanged").

For this picture, the parameters have the following values:

See some related pictures (including this one):

[for more information about pseudo-quaternionic numbers (en français/in french)]
[for more information about pseudo-octionic numbers (en français/in french)]

[for more information about N-Dimensional Deterministic Fractal Sets (in english/en anglais)]
[pour plus d'informations à propos des Ensembles Fractals Déterministes N-Dimensionnels (en français/in french)]

(CMAP28 WWW site: this page was created on 03/12/2012 and last updated on 04/01/2017 11:19:44 -CEST-)

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