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    $\begingroup$ that's pretty neat! It s also actually close to how large scale structure filaments are gravitationally generated. $\endgroup$ Commented Mar 9, 2013 at 16:43
  • $\begingroup$ The end result is very nice (+1) - and it shows you don't have to be physically accurate to get realistic looking output. That's how I understood the question: get something realistic without doing a full ab-initio simulation. $\endgroup$ Commented Mar 9, 2013 at 16:56
  • $\begingroup$ MY GOD ! This is what I need ! I'll try the code in the following minutes, trying to understand it ! 8*) $\endgroup$ Commented Mar 9, 2013 at 17:22
  • $\begingroup$ I now have tons of questions about this (LOL). The code is working in Mma 7.0, but I don't see any filaments yet. It's just a large sphere of random balls. Also, how can I extract the cartesian coordinates and the color as RGB numbers ? $\endgroup$ Commented Mar 9, 2013 at 17:27
  • $\begingroup$ @Simon Woods : Sorry if I'm such a noob, but I need some explanations for the various parameters in the code above. I'm yet unable to see any filaments structures ; I'm getting random balls scatered in a large sphere. A few more questions : how can we make the whole distribution oblate ? It needs an oblateness parameter to squash the sphere like the Crab nebula. Also, I need to extract the data to a text file, into a list of cartesian coordinates followed by the RGB numbers. Is it possible for you to show a complete Mma7.0 code with comments, so we could understand the parameters ? $\endgroup$ Commented Mar 9, 2013 at 17:43