    bottom.rotation.x = 180 * Math.PI / 180;
        bottom.position.z = 0;
        building.add(bottom);
      }

      building.position.x = v * 100;
      building.position.y = i * 100;
      building.position.z = 0;
      this.scene.add(building);
    }
  }
}
            </code></pre>
          </section>
          <section>
            <h2>Render Loop</h2>
            <h3>engine.js</h3>
            <pre><code>
update() {
  this.updateCamera();
}

render() {
  this.update();
  this.renderer.render(this.