ogre 绘制坐标系

Ogre::ManualObject* pManualObject=mSceneMgr->createManualObject("TestManualObject"); 

if(NULL==pManualObject) 

return; 

pManualObject-> begin( "BaseWhiteNoLighting",   Ogre::RenderOperation::OT_LINE_LIST); 

{ 

//x

pManualObject-> position(0,0,0); 

pManualObject-> colour(Ogre::ColourValue::Blue);

pManualObject-> position(20,0,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(20,0,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(17,3,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(20,0,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(17,-3,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

//y

pManualObject-> position(0,0,0); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(0,20,0); 

pManualObject-> colour(Ogre::ColourValue::Green); 

pManualObject-> position(0,20,0); 

pManualObject-> colour(Ogre::ColourValue::Green); 

pManualObject-> position(3,17,0); 

pManualObject-> colour(Ogre::ColourValue::Green); 

pManualObject-> position(0,20,0); 

pManualObject-> colour(Ogre::ColourValue::Green); 

pManualObject-> position(-3,17,0); 

pManualObject-> colour(Ogre::ColourValue::Green); 

//z

pManualObject-> position(0,0,0); 

pManualObject-> colour(Ogre::ColourValue::Blue); 

pManualObject-> position(0,0,20); 

pManualObject-> colour(Ogre::ColourValue::Red); 

pManualObject-> position(0,0,20); 

pManualObject-> colour(Ogre::ColourValue::Blue); 

pManualObject-> position(0,3,17); 

pManualObject-> colour(Ogre::ColourValue::Blue); 

pManualObject-> position(0,0,20); 

pManualObject-> colour(Ogre::ColourValue::Blue); 

pManualObject-> position(0,-3,17); 

pManualObject-> colour(Ogre::ColourValue::Blue); 

} 

pManualObject-> end(); 

Ogre::SceneNode* pSceneNode=mSceneMgr->getRootSceneNode()->createChildSceneNode( "TestSceneNode "); 

if   (NULL == pSceneNode) 

return ; 

pSceneNode-> attachObject(pManualObject);