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simple

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script type="importmap">
    {
      "imports": {
        "three": "https://cdn.jsdelivr.net/npm/three@0.176.0/+esm",
        "@mulsense/xnew": "https://unpkg.com/@mulsense/xnew@0.2.x/dist/xnew.mjs",
        "@mulsense/xnew/addons/xthree": "https://unpkg.com/@mulsense/xnew@0.2.x/dist/addons/xthree.mjs"
      }
    }
  </script>
  <script type="module" src="./script.js"></script>
</head>

<body style="margin: 0; height: 100vh;">
  <div id="main" style="width: 100%; height: 100%;"></div>
</body>

</html>
script.js
import xnew from '@mulsense/xnew';
import xthree from '@mulsense/xnew/addons/xthree';
import * as THREE from 'three';

xnew('#main', Main);

function Main(main) {
  xnew.extend(xnew.basics.Screen, { width: 800, height: 400 });

  // three setup
  xthree.initialize({ canvas: main.canvas });
  xthree.camera.position.set(0, 0, +100);

  xnew(Cubes);
}

function Cubes(unit) {
  const object = xthree.nest(new THREE.Object3D());

  for (let z = -1; z <= 1; z++) {
    for (let y = -1; y <= 1; y++) {
      for (let x = -1; x <= 1; x++) {
        xnew(Cube, { x: 15 * x, y: 15 * y, z: 15 * z, size: 6 });
      }
    }
  }
  unit.on('-update', () => {
    object.rotation.y += 0.01;
    object.rotation.z += 0.01;
  });
}

function Cube(unit, { x, y, z, size }) {
  const geometry = new THREE.BoxGeometry(size, size, size);
  const material = new THREE.MeshNormalMaterial();
  const object = xthree.nest(new THREE.Mesh(geometry, material));
  object.position.set(x, y, z);
  
  unit.on('-update', () => {
    object.rotation.x += 0.01;
    object.rotation.y += 0.01;
  });
}