Menger Sponge

Select with the sliders in the upper left corner the generation of the Menger sponge (mass fractal), G: 1-4 (if G = 4 the animation of the fractal might be slow), the total size of the fractal (R0: 1-100 units), the greyscale of the background (back) and the speed of 3D-rotation of the fractal.