I'd also include the scrubber in the canvas view, or reference it view viewof angle.value (perhaps with Generators.input()), so that the animation can play fluidly

*"reference it via viewof"

(I can make that change if you're interested)

sure :) go ahead

Turns out the performance difference is insignificant. :/

This would be an obvious candidate for a webgl approach, but I had not started this way and just wanted to see the image. What would be cool (in webgl) would be to animate the oil itself, maybe with a 3D perlin…