2 Questions: Clear Buffer and Backface culling

Hi there,

I'm not really sure about the dumbness of these questions because I think I'm not really into this,
but here are them:

1. I have a static background so I guess I don't need to render it all the time. Something like NOT clear the Buffer could solve the problem but I don't know how to do it without affecting the other objects. Do you have some solution for this?

2. backface culling is being applied?
My application starts with no object on the screen but become with lots of them. The majority of those objects are being covered by others. Is it rendering those hidden objects too? If yes how can I set the backface culling?

I'll really appreciate your help and

Congratulations for your work