v></div><div class="field "><a name="count"></a><h3 class="anchor"><code><a href="#count"><span class="identifier">count</span></a> ():<span class="type">Int</span></code></h3><div class="doc"><p>Returns the number of tiles added to the group</p></div></div><div class="field "><a name="invalidate"></a><h3 class="anchor"><code><a href="#invalidate"><span class="identifier">invalidate</span></a> ():<span class="type">Void</span></code></h3><div class="doc"><p>If you want to add tiles after the GPU memory has 