Fractal Sphereflake (cubic symmetry)

Select with the sliders in the upper left corner the generation of the (surface) fractal (G: 0-7, if G > 5 the animation of the fractal might be slow), the size ratio between the spheres of the fractal generations (RS: 1.0-4.0, if RS < 2 the spheres start overlapping), the total size of the fractal (R0: 25-250 units), the greyscale of the background (back) and the speed of 3D-rotation of the fractal.