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Some examples are in http://en.wikipedia.org/wiki/Metaballs. Can we draw them in scientific software like matlab, mathematica,...?

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It is certainly possible. You've linked to the wikipedia article which gives an explanation of how metaballs are generated. Is there something specific you're having trouble with? –  axblount Oct 5 '12 at 15:21
    
I know those formulas. But I am not familiar with scientific drawing. Can you give some code examples? –  LittleSweet Oct 5 '12 at 15:26
    
In Mathematica, I think RegionPlot3D would be well suited for this. The colouring of the balls would then be done with a suitable ColorFunction. –  celtschk Oct 5 '12 at 15:30
    
I googled RegionPlot3D, it looks cool. Thanks! –  LittleSweet Oct 5 '12 at 15:34

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