         </code></pre>
          </section>
          <section>
            <iframe width="100%" height="600" data-src="/ch6.html">
            </iframe>
          </section>



          <!-- Adding Collisions -->
          <section>
            <h1>Adding Collision Detection</h1>
          </section>
          <section>
            <h2>Simple 2-point collision detection</h2>
            <img class="stretch" src="/images/slides/collision.png" />
          </section>
          <section>
            <pre><co