let angle = 0;

​

function setup() {

  createCanvas(400, 400, WEBGL);

  angleMode(DEGREES);

}

​

function draw() {

  background(0, 0, 100);

  orbitControl(1, 1);

  noFill();

  stroke(255);

  beginShape(LINES);

  let a = 1.5;

  let b = 1;

​

  for (let phi=0; phi<360; phi+=3) {

​

    let x = (r1 + r2*cos(a*phi))*cos(b*phi);

    let y = (r1 + r2*cos(a*phi))*sin(b*phi);

    let z = r2*sin(a*phi);

    vertex(x, y, z);

    let x2 = (r1 + r2*cos(180 + a*phi))*cos(b*phi);

    let y2 = (r1 + r2*cos(180 + a*phi))*sin(b*phi);

    let z2 = r2*sin(180 + a*phi);

    vertex(x2, y2, z2);

  }

​

  endShape();

  angle +=1;

}

​