WebGL Gray-Scott Explorer (2012)

Summary

WebGL Gray-Scott Explorer 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. Instructions: Use the mouse to draw in the large image area. Alternate clicks paint "high-U" (red in the default colours) or "low-U" (blue). The init button makes the pattern blank, or random. Click it multiple times until you get what you want. Use the list of presets to see examples of patterns from the wide diversity of types available. Each preset has a classification (usually a Greek letter); these are explained on the separate page Pearson's Classification (Extended) of Gray-Scott System Parameter Values. Things to try with each preset : (assuming that you're using the default colour scheme -- reloading the page will restore the default colours.) Negative bubbles (sigma) : Hit Init until you get blue spots on a red background. They will grow, but not join; you'll end up with blue bubbles separated by red lines. Positive bubbles (rho) : Hit Init until you get a red and blue "Swiss cheese" type pattern. Small bubbles will coalesce into larger ones. Precritical bubbles (rho/kappa) : Start with either of the preceding examples (sigma or rho), then switch to this one. Worms and loops (kappa) : Hit Init until you get blue spots on a red background. Stable solitons (nu) : Hit Init until you get a blank red background. Then draw a few individual blue dots close to each other. They will either merge into one or repel each other. The U-Skate World (pi) : Start with a blank all-blue background, then slowly paint a small letter "u" in red. If you get it just right, it will become a U-Skate and travel across the screen. Try making U-Skates crash into each other. Worms (mu) : Start with a random pattern or by scribbling in blue on a blank red background. Worms join into maze (kappa) : Start the same way you did with "Wo...