const tau = 2 * Math.PI;

​

//CURVE

let a = 5000;

const r = 100;

const tStart = 0;

const tEnd = 20;

const tStep = 0.01;

​

function x(t) {

  return r * sin(tau * t);

}

​

function y(t) {

  return -t;

}

​

function z(t) {

  return r * cos(tau * t);

}

​

function setup() {

  createCanvas(800, 800, WEBGL);

  camera(0, -400, 0, 0, 0, 0, 1, 0, 0);

}

​

function draw() {

  background(229, 255, 234, 125);

  //CURVE

  noFill();

  stroke(0);

  strokeWeight(1);

​

  beginShape();

  for(let t = tStart; t < tEnd; t += tStep) {

    vertex(x(t), a * y(t), z(t));

  }

  endShape();

  if (a > 0.1) {

    a *= 0.99;

  }

}