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WebGL Gray-Scott Explorer (2012)
The Gray-Scott equations can produce most of the types of patterns that are possible in reaction-diffusion systems. For a complete description of Gray-Scott patterns, with many examples and videos, go to my Xmorphia Gray-Scott page.
Positive bubbles (rho) : Hit Init until you get a red and blue "Swiss cheese" type pattern. The U-Skate World (pi) : Start with a blank all-blue background, then slowly paint a small letter "u" in red. Turing patterns (delta) : Hit Init until you get a plain green background, then click in it 3 or 4 times with the mouse.
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