ack.position.y = -50;
        back.position.z = -100;
        back.rotation.y = -180 * Math.PI / 180;
        back.rotation.x = -90 * Math.PI / 180;

        building.add(top).add(right).add(left).add(front).add(back);

      } else {
        let bdiv = document.createElement('building');
        building = new THREE.CSS3DObject(bdiv);

        let bottomdiv = document.createElement('div');
        bottomdiv.className = 'bottom ' + this.map[i][v];

        let bottom = new THREE.CSS3DObject(bottomdiv);
    