Please suggest some C formulas for a planar Z graph

[ant123]

Hi ,

I have a game engine graph where i can mathematically combine X and Y to generate new data for the Z axis, in other words making elevation data and fractals.

For example i can tell the program

z=sin(x*20)*sin(y*20),

and it will render map of sine bumps.

So i am programming some mountains and things as i code trigonometry ok, but i have little idea how to code C and no idea how to do fractal maths.

  could anyone please walk me through some fractal formulas, to copy areas of a graph on top of each other in iterations, or if i can put some mandelbox/fun fractal/procedural shapes onto the maps, going from the limitaion that i can only do warped plane maths where:

x=0 to 1
y=0 t0 1

Z= maths made with x and y

here are some pics:

Thanks!