Add some documentation.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4460 dfc29bdd-3216-0410-991c-e03cc46cb475

examples/03.CustomSceneNode/main.cpp

@@ -126,6 +126,9 @@ public:
 	*/
 	virtual void render()
 	{
+		/* Indices into the 'Vertices' array. A triangle needs 3 vertices 
+		so you have to pass the 3 corresponding indices for each triangle to 
+		tell which of the vertices should be used for it.	*/
 		u16 indices[] = {	0,2,3, 2,1,3, 1,0,3, 2,0,1	}; 
 		video::IVideoDriver* driver = SceneManager->getVideoDriver();