how do i keep a plane perpendicular to the camera?

i want to create a textured background on a plane who’s normal stays perpendicular to the camera at all times. is that the best way? and how do i do it?

I think what you’re looking for is called “Billboarding”. Here’s a tutorial that was very helpful to me:

A Google search on “opengl billboard” should also turn up a lot of results.

Hope that helps.