Hash is pseudorandom. It amplifies the rounding error of the sine function, as explained here: https://stackoverflow.com/a/4275343 https://stackoverflow.com/a/4

Hash is pseudorandom. It amplifies the rounding error of the sine function, as explained here: https://stackoverflow.com/a/4275343 https://stackoverflow.com/a/4275343 The reason I didn't use fragCoord was because I wasn't sure it would be within range, though thinking about it, I can't really see why it wouldn't be since before the engine was using it directly (d'oh). Anyways I did the mod 9 and divide by 10 to ensure it was in the range of [0, 0.8999999...]. The idea there was I got initial the impression (though I didn't really dig) that the hash function generates a point between x and y of the vector. Reviewing, it seems this was a silly notion. I think you're right, now that I'm looking at it again. Your way of getting h1 and h2 is much more efficient.