​

function preload() {

  createARCanvas();

}

​

function setup() {

  describe("Leave trail with left hand while right one is pinched.");

  mainHandMode(RIGHT);

}

​

function draw() {

  sphere(0.0001); // hack, it is currently a problem if we don't draw anything

  strokeWeight(4);

  stroke(255);

  noFill();

​

  if (fingersArePinched) {

    for (let i = 0; i < fingersAlt.length; i++) {

      let finger = fingersAlt[i];

      trails[i].push({...finger}); 

    }

  } else {

    trails = [[], [], [], [], []];

  }

  for (let i = 0; i < trails.length; i++) {

    const trail = trails[i];

    beginShape();

    for (const v of trail) {

      vertex(v.x, v.y, v.z);

    }

    endShape();

  } 

}

​