Get a collection of nodes from the engine, based on the type of the node required.
<p>The engine will create the appropriate NodeList if it doesn't already exist and
will keep its contents up to date as entities are added to and removed from the
engine.</p>
<p>If a NodeList is no longer required, release it with the releaseNodeList method.</p>
Get a collection of nodes from the engine, based on the type of the node required.
<p>The engine will create the appropriate NodeList if it doesn't already exist and will keep its contents up to date as entities are added to and removed from the engine.</p>
<p>If a NodeList is no longer required, release it with the releaseNodeList method.</p>
@param nodeClass The type of node required.