Why the boxes are not visible when the camera is in some position

Questions
1

Some of the boxes are not visible when the scene is rotated in some position.
The code pen is: https://codepen.io/gisfinder/pen/QWVmKJv

2

try setting your internal meshes to a lower renderOrder than the external one…

  for (let i = 0; i < 5; i++) {
    const mesh2 = internalBox.clone();
    mesh2.renderOrder = -1;
    mesh2.position.set(0, 0, 8 * i);
    scene.add(mesh2);
  }

also see this

3

Thanks a lot. It works! :grinning: