Very hard! In short, you need a very high frame rate to make it look smooth. 120 is a good number. I’ve tried on 4 different platforms, Flash, JavaScript, Processing and OpenFrameworks. Needless to say, OpenFrameworks can do it without a sweat. Javascript’s result is almost as good as OF in Firefox, Chrome and Safari [...]

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To have 2 glows, you need to apply the inner glow first then the outer glow. If not, the inner glow will not be activated. It’s true for both timeline based filters and scripted filters.

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