Added culling sample.

samples/o3d-webgl/pack.js

 /*
  * Copyright 2010, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 55 matching lines @@
  * itself will be released from the client.  See documentation on
  * pack.removeObject for why this is important.
  *
  * It's important to note that many objects are only referenced by the pack.
  * Textures, Effects, Materials, for example. That means the moment you call
  * pack.destroy() those objects will be freed. If the client then tries to
  * render and some objects are missing you'll immediately get an error.
  */
 o3d.Pack.prototype.destroy = function() {
   this.objects_ = [];
+  this.client.removePack(this);
 };
 
 
 
 /**
  * Removes a pack's reference to an object. Any object created from
  * pack.create___ function can be removed. This releases the pack's reference
  * to that object so if nothing else is referencing that object it will be
  * deleted.
  *
@@ skipping 337 matching lines @@
 /**
  * Create RawData given a data URL.
  * @param {string} data_url The data URL from which to create the RawData.
  * @return {!o3d.RawData}  The RawData.
  */
 o3d.Pack.prototype.createRawDataFromDataURL =
     function(data_url) {
   o3d.notImplemented();
 };