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import sysimport wximport ogre.renderer.OGRE as ogre # singleton implementation of OgreManager_ogremanager = Nonedef getOgreManager():    global _ogremanager    if _ogremanager is None:        _ogremanager = OgreManager()    return _ogremanagerclass OgreManager():    renderWindows = {}    def restart(self):    	self.ogreRoot.shutdown()        self.init()            def __init__(self):         self.init()            def init(self):        #Root creation         self.ogreRoot = ogre.Root(self.getConfigPath('plugins.cfg'), self.getConfigPath('ogre.cfg'), "ogre.log")                self.ogreRoot.showConfigDialog()                             self.ogreRoot.initialise(False)    def getRoot(self):        return self.ogreRoot            def getConfigPath(self, filename):        """Return the absolute path to a valid config file."""         import sys        import os        import os.path                paths = [os.path.join(os.getcwd(), filename),                 os.path.join(os.path.dirname(os.path.abspath(__file__)), filename)]        for path in paths:            if os.path.exists(path):                print path                return path        sys.stderr.write("\n"            "** Warning: Unable to locate a suitable " + filename + " file.\n"            "** Warning: Please check your ogre installation and copy a\n"            "** Warning: working plugins.cfg file to the current directory.\n\n")        #raise ogre.Exception(0, "can't locate the '%s' file" % filename, "")            def createRenderWindow(self, wxOgrewin, name, width, height, fullscreen, handle):        renderParameters = ogre.NameValuePairList()         renderParameters['externalWindowHandle'] = str(handle)         # use len to make the names unique!        renderWindow = self.ogreRoot.createRenderWindow(name + str(len(self.renderWindows)), width, height, fullscreen, renderParameters)         #renderWindow.active = True         self.renderWindows[wxOgrewin] = renderWindow        return renderWindow    def RenderAll(self):        for ogrewin in self.renderWindows.keys():            ogrewin.OnFrameStarted()            try:            self.ogreRoot.renderOneFrame()        except ogre.OgreException, e:            print '## EXCEPTION ##'            print str(e)                for ogrewin in self.renderWindows.keys():            ogrewin.OnFrameEnded()                        def createSceneManager(self, type):        return self.ogreRoot.createSceneManager(type, "SceneManager" + str(len(self.renderWindows)))