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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2d

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algorithm

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graphic-effects

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).

enter image description here

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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