title: Wrapping 2D perlin noise
body: <p>I'm working with Perlin Noise for a height map generation algorithm, I would like to make it wrap around edges so that it can been seen as continuous.. is there a simple way or trick to do that? I guess I need something like a spherical noise so that either horizontally and vertically it wraps around. I would be happy also with just 1 wrapping axis but two would be better.</p>
  
  <p>For now I'm using the classical algorithm in which you can set up how many octaves you want to add and which are the multipliers used for changing amplitude and frequency of the waves between every successive octave.</p>
  
  <p>Thanks in advance!</p>