n class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
    <span class="special">{</span>
        <span class="comment">// add a box into the container</span>
        <span class="identifier">box</span> <span class="identifier">b</span><span class="special">(</span><span class="identifier">point</span><span class="special">(</span><span class="identifier">i</span> <span class="special">+</span> <span class="number">0.0f</span><span class="s