3dQR

let qr;
let t, d, startGrid, endGrid;
let cells;
let nCells;
let bSize = 100;
let qrCodeGeometry;

function preload() {
  qr = loadImage("/assets/qr2_1.jpg");
}
function setup() {
  let c = min(windowWidth, windowHeight) * 0.7;
  createCanvas(c, c, WEBGL);
  initializeQR();
  qrCodeGeometry = buildGeometry(() => {
    for (let i = 0; i < nCells - int((startGrid * 2) / d); i++) {
      for (let j = 0; j < nCells - int((startGrid * 2) / d); j++) {
        if (cells[i][j] === 1) {
          push();
          translate(-width / 2 + d * i, -height / 2 + d * j, bSize / 2);
          box(d, d, bSize * cells[i][j]);
          pop();
        } else {
          push();
          translate(-width / 2 + d * i, -height / 2 + d * j, 5);
          box(d, d, 10);
          pop();
        }
      }
    }
  });
}

function draw() {
  t = frameCount / 100;
  scale(0.6);
  orbitControl();
  rotateY((PI / 4) * sin(t / 2));
  rotateX((PI / 4) * sin(t / 5));
  rotateZ((PI / 4) * sin(t / 3));
  background(255);
  pointLight(255, 255, 255, 600, 600, 600);
  specularMaterial(255);
  model(qrCodeGeometry);
}

function initializeQR() {
  cells = [];
  let cnt = 0;
  startGrid = cnt;

  let col1 = [255, 255, 255, 255];
  noStroke();
  while (col1[0] > 200 && cnt < width / 3) {
    x = cnt;
    y = 5;
    col1 = qr.get(qr.width / (width / cnt), qr.height / (height / cnt));

    cnt++;
    startGrid = cnt;
  }
  let cnt2 = width;
  endGrid = cnt2;
  col1 = [255, 255, 255, 255];
  while (col1[0] > 200 && cnt > width / 3) {
    x = cnt2;
    y = 5;
    col1 = qr.get(qr.width / (width / cnt2), qr.height / (height / cnt2));
    cnt2--;
    endGrid = cnt2;
  }
  col1 = [0, 0, 0, 2055];
  while (col1[0] < 200 && cnt < width / 3) {
    x = cnt;
    y = startGrid;
    col1 = qr.get(qr.width / (width / x), qr.height / (height / y));
    cnt++;
  }
  d = (cnt - startGrid) / 7;
  nCells = int(width / d) + 1;
  populateGrid();
}

function populateGrid() {
  for (let i = 0; i < nCells; i++) {
    cells[i] = [];
    for (let j = 0; j < nCells; j++) {
      x = i * d + startGrid;
      y = j * d + startGrid;
      col = qr.get(qr.width / (width / x), qr.height / (height / y));

      if (col[0] > 100) {
        a = 0;
      } else {
        a = 1;
      }
      cells[i][j] = a;
    }
  }
}

function keyPressed() {
  if (keyCode === 83) {
    qrCodeGeometry.saveStl("model.stl", { binary: true });
  }
}