title: Ogre::SceneManager::setAmbientLight doese not work
body: <p>i am building the wiki <a href="http://www.ogre3d.org/tikiwiki/Advanced%20Ogre%20Framework" rel="nofollow">Advanced Ogre Framework</a>,
  then i find that the Ogre::SceneManager::setAmbientLight() does not work at all.
  i find nothing useful after google, anyone can give me some idea?
  the code is like this:</p>
  
  <pre><code>m_pSceneMgr = OgreFramework::getSingletonPtr()-&gt;m_pRoot-&gt;createSceneManager(ST_GENERIC, "GameSceneMgr");
  m_pSceneMgr-&gt;setAmbientLight(Ogre::ColourValue(0.7f, 0.7f, 0.7f));
  </code></pre>