A physical Engine
To use CEGUI in Ogre, I followed the tutorial in the wiki and added the gui to my existing code. However, I found that my drawing code draw twice!!!!!
One is drawn on the whole window and the other is draw as I desired in the gui frame window.
For two days searching on line, found nothing help.
I just comment everything and test every code part. Finally I found that both the gui and my drawing objects are in the RENDER_QUEUE_OVERLAY.
That's the problem!!!!!
By changing my drawing objects to RENDERE_WORLD_GEOMETRY_1, everything works well!!!!!!