Perlin Noise looped

loopingPerlinNoise.jsx

//based on https://workbench.tv/tutorials/2019-05-10_LoopingNoise

amplitude = 100;
freq = .5; // loop/second
ofst = 0 ; //offset from 0 to 1
sed = 0; // seed
s = .1 ; // complexity

a = (time + ofst/freq ) * 2 * Math.PI * freq  ;
x = Math.cos(a) * s + sed;
y = Math.sin(a) * s + sed;
noise([x, y]) * amplitude;