/ keyboardWidth / 2, 0)
        .applyMatrix4(planeMesh.matrixWorld);
      object.topLine.end
        .set(1/2, keyboardHeight / keyboardWidth / 2, 0)
        .applyMatrix4(planeMesh.matrixWorld);

      object.plane.setFromCoplanarPoints(
        object.leftLine.start,
        object.leftLine.end,
        object.topLine.end
      );
    };

    return object;
  })();
  rig.add(keyboardMesh);
  rig.keyboardMesh = keyboardMesh;

  return rig;
};
const rig = _makeRig();
scene.add(rig);

const _openRig = (pos