How do produce a "mucus spreading" effect in a 2D environment?

Posted by nathan on Game Development See other posts from Game Development or by nathan
Published on 2012-11-15T09:45:24Z Indexed on 2012/11/15 11:26 UTC
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Here is an example of such a mucus spreading. The substance is spread around the source (in this example, the source would be the main alien building).

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The game is starcraft, the purple substance is called creep.

How this kind of substance spreading would be achieved in a top down 2D environment? Recalculating the substance progression and regenerate the effect on the fly each frame or rather use a large collection of tiles or something else?

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