Clearscreens are pretty fast on a decent gfx card, it has almost no effect.
Also yes, it would be nice to be able to decide to what buffer an image is drawn, and be able to then render using that buffer, but at the moment it's a bit tricky because that's not how OpenGL works, at least not the version implemented. As someone mentioned, pbuffers were added later to do this.
Meanwhile, it's time to get creative to find a solution that works for you.
Anyway... you're saying that you want to be able to draw like different body parts to a buffer and then render that single buffer? Why not just draw all the body parts seperately in realtime? I still don't get that you really need to put it in a buffer first?
Also yes, it would be nice to be able to decide to what buffer an image is drawn, and be able to then render using that buffer, but at the moment it's a bit tricky because that's not how OpenGL works, at least not the version implemented. As someone mentioned, pbuffers were added later to do this.
Meanwhile, it's time to get creative to find a solution that works for you.
Anyway... you're saying that you want to be able to draw like different body parts to a buffer and then render that single buffer? Why not just draw all the body parts seperately in realtime? I still don't get that you really need to put it in a buffer first?