​

function setup() {

  createCanvas(600, 600, WEBGL);

}

​

function draw() {

  background(200);

  orbitControl(1, 1, 0.01);

  ambientLight(150);

  noStroke();

    ambientMaterial(250);

  seashell(200, 360, 0.1, 0.15);

  angle += 0.01;

}

​

function seashell(radius, totalPoints, a, b) {

  beginShape(TRIANGLE_STRIP);

  for (let i = 0; i <= totalPoints; i++) {

    let lat = map(i, 0, totalPoints, 0, PI);

    for (let j = 0; j <= totalPoints; j++) {

      let lon = map(j, 0, totalPoints, 0, TWO_PI);

      let r = radius * (1 - sin(lat) + cos(lon) * a + sin(angle + lat * 8) * b);

      let x = r * sin(lat) * cos(lon);

      let y = r * sin(lat) * sin(lon);

      let z = r * cos(lat);

      vertex(x, y, z);

      lat += 0.01;

      r = radius * (1 - sin(lat) + cos(lon) * a + sin(angle + lat * 8) * b);

      x = r * sin(lat) * cos(lon);

      y = r * sin(lat) * sin(lon);

      z = r * cos(lat);

      vertex(x, y, z);

    }

  }

  endShape();

}

​