A fractal surface (two iterations) defined by means of three bidimensional fields [Une surface fractale (deux itérations) définie à l'aide de trois champs bidimensionnels].




Many surfaces -bidimensional manifolds- in a tridimensional space can be defined using a set of three equations: 
                    X = Fx(u,v)

                    Y = Fy(u,v)

                    Z = Fz(u,v)
with: 
                    u ∈ [Umin,Umax]

                    v ∈ [Vmin,Vmax]
[Umin,Umax]*[Vmin,Vmax] then defined a bidimensional rectangular domain D. 
                       v ^
                         |
                    V    |...... ---------------------------
                     max |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                         |      |+++++++++++++++++++++++++++|
                    V    |...... ---------------------------
                     min |      :                           :
                         |      :                           :
                         O------------------------------------------------->
                                U                           U              u
                                 min                         max

If D is sampled by means of a bidimensional rectangular grid (made of Nu*Nv points), the three {X,Y,Z} coordinates can be defined by means of three rectangular matrices: 
                    X = Mx(i,j)

                    Y = My(i,j)

                    Z = Mz(i,j)
with: 
                    i = f(u,Umin,Umax,Nu)

                    j = g(v,Vmin,Vmax,Nv)
where 'f' and 'g' denote two obvious linear functions...


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For the fractal surface, the three {X,Y,Z} fields/matrices are as follows:




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