How can I use openGL func glortho()?

[d3d3d353]

Hi All,
I try to use glortho(),but it doesn't seem to work.
I use the Tutorials2.Quake3Map.I load a ball which made by 3dmax.The code is:
addcamerascenenode(...);
beginscene(...);
glviewport(...);
......
glortho(...);
drawall();
endscene();

glortho()doesn't work,what shall I do?Thanks a lot.

[hybrid]

Why don't you use the Irrlicht methods for ortho cams?

[d3d3d353]

Why don't you use the Irrlicht methods for ortho cams?

Thanks a lot. but I still don't understand. Could you explain it more specifically? Which method can I use?
Thank you!

[Mel]

Read in the documentation about the methods of the ICameraSceneNode, the ISceneManager and the matrix4 classes to learn properly how to create an orthogonal projection matrix, and how to set it, and how to enable this camera to render the scenes.

matrix4
ISceneManager
ICameraSceneNode