createCanvas(800, 600, WEBGL);

  angleMode(DEGREES);

}

​

function draw(){

  background(200,200,0);

  rotateY(90);

  orbitControl();

​

  let p0 = createVector(0, 20, 0);

  let p1 = createVector(0, 0, 40);

  let p2 = createVector(0, -60, 0);

  let p3 = createVector(0, 0, -40);

​

  beginShape();

  fill(2);

  stroke(0,0,200);

  strokeWeight(2);

  vertex(p0.x, p0.y, p0.z);

  bezierVertex(p1.x, p1.y, p1.z, p2.x, p2.y, p2.z, p2.x, p2.y, p2.z);

  bezierVertex(p2.x, p2.y, p2.z, p3.x, p3.y, p3.z, p0.x, p0.y, p0.z);

  endShape(CLOSE);

}