] can be used to get the ray from the camera position to a given screen position by using two different camZ values.
For instance the 3D ray between unproject(0,0,0) and unproject(0,0,1) is the center axis of the 3D frustum.</p></div></div><div class="field "><a name="update"></a><h3 class="anchor"><code><a href="#update"><span class="identifier">update</span></a>():<a class="type" title="Void - The standard Void type." href="../Void.html">Void</a></code></h3><div class="doc"><p></p></div></div></div></div>