Added getStart()/getEnd()
Added getStart()/getEnd()


XiaoCC/osg,koshman86/osg,stmh/osg,ghub/osg,artoolkit/osg,ntoand/osg,omega-hub/osg,stmh/osg,XiaoCC/osg,ntoand/osg,omega-hub/osg,koshman86/osg,omega-hub/osg,stmh/osg,omega-hub/osg,artoolkit/osg,XiaoCC/osg,XiaoCC/osg,stmh/osg,ghub/osg,ntoand/osg,artoolkit/osg,ntoand/osg,koshman86/osg,koshman86/osg,artoolkit/osg,stmh/osg,ghub/osg,ghub/osg,XiaoCC/osg