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For example if I draw a cube and turn my character around so as to face away from the cube does it use CPU/gpu processing to draw it even though it is not on screen? Do I as a programmer need to be smart enough to not make opengl draw calls if an object is not on screen or very far away?
It doesn’t render them as such, but it does use resources which I believe is what you’re asking. Yes, you do.
You’re probably after frustum culling: