Bias function source:

  A Convenient Generalization of Schlick’s Bias and Gain Functions

  By Jonathan T. Barron: https://arxiv.org/pdf/2010.09714.pdf

​

  This script can render avi's and gifs. Setup recording in setup(). 

  Press enter to start and stop recording.

  Will also stop recording after full cycle. Use this for perfect loops :)

​

  Feel free to share your gifs on my discord server! 

  https://discord.com/invite/DxbUee2y6D

  (max upload 8mb)   

  recommended gif settings:

    canvas size: 500x500

    quality: 1 (highest for 'accurate' colours)

    fps: 30 (or lower to save space)

    frames: 500

  libraries used:

    Video Builder: https://github.com/theshock/VideoBuilder

    gif.js: https://github.com/jnordberg/gif.js

    download: https://github.com/rndme/download

*/

​

const frames = 250;

const fps = 60;

let rec;

let frame = 0;

​

function setup() {

  // const size = min(windowWidth, windowHeight); // fill window

  // const size = 1080; // avi recording

  const size = 500;  // gif recording

​

  const canvas = createCanvas(size, size);

​

  colorMode(HSL, 1);

  frameRate(fps);

​

  rec = setupRecording("bias wobble", canvas, {

    // avi: {

    //   fps: 60, 

    //   quality: 0.92 // full quality (1) does not encode properly (sad face)

    // },

    gif: {

      fps: 30,

      quality: 1, // lower is better (1 = best). Works to reduce filesize but fucks with colour, would recommend lowering fps instead ✌️

      workers: 10 // multithreaded workers

    }

  });

}

​

const eps = 0.00000000001;

const ssin = (v) => sin(v * TWO_PI);

const scos = (v) => cos(v * TWO_PI);

const sinn = (v) => ssin(v) * 0.5 + 0.5;

const cosn = (v) => scos(v) * 0.5 + 0.5;

const invCosn = (v) => 1 - cosn(v);

const tri = (v) => 1 - abs(1 - fract(v) * 2);

const bias = (x, s, t) => x < t ?

  t * x / (x + s * (t - x) + eps) :

  (1 - t) * (x - 1) / (1 - x - s * (t - x) + eps) + 1

​

let t;

​

function draw() {

  let inc = 1;

  if (!rec.recording)

    inc = deltaTime / (1000 / fps);

  frame += inc;

​

  t = fract(frame / frames);

  // t = fract(mouseX / width);

​

  scale(width, height);

  strokeWeight(0.005);

​

  drawScene();

​

  if (rec.recording)

    rec.recordFrame();

}

​

function drawScene() {

  background(0);

  stroke(1);

  fill(0);

​

  // const bs =  5 * mouseX / width;

  // const bt =  1 - mouseY / height;

  const bs = 5 * sinn(t);

  const bt = cosn(t);

​

  circle(0.5, 0.5, 0.5 * bias(tri(t), bs, bt));

  circle(bias(tri(t), bs, bt), 0.5, 0.01);

​

  const count = 1000;

  for (let i = 0; i < count; i++) {

    const x = i / count;

    const y = bias(x, bs, bt)

    const x2 = (i + 1) / count;

    const y2 = bias(x2, bs, bt)

    line(x, 1- y, x2, 1-y2);

  }

}