[PyOpenGL-Users] Missing Quadrilaters in a view-Newbie's question

[projetmbc <pro...@cl...>]

Hello,
this is my first post on this list. I've decided to use OpenGL with 
PyQt. My first test is to draw a cartesian surface using quadrilaters.
My problem is that when I move my scene with the mouse, sometime the 
point of view makes disappear some quadrilaters. I think that is due to 
my lake of knowledge about the definition of the view scene. How can I 
avoid this kind of problem ?

Best regards.
Christophe

PS : I could put herer my python code if it's necessary.