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Sand Ripples

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Alasdair
Turner
This is an attempt at creating some sand ripples or dunes by blowing a "wind" across a brightness level. I'm not sure the mechanism is quite right, but it has the kind of effect I wanted... (I'm having difficulty with this running on Opera on the Mac. Seems to be fine on Safari, Firefox or a PC. It should settle to look like the thumbnail after a short period.)
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