Actually that is not perlin noise, I don't have a good working perlin. if you want a fast perlin then your going to have to cheat like everone else. there are many different methods out there if you take the time to dig around a bit. I'm not really doing much with perlin right now so I haven't really perused it myself this. try this http://drilian.com/category/developm...ural-textures/ and see if there are some better ideas for you