why am i forced to clear the buffers?
I suspected that i could just “overdraw” the last drawing operation. But when i tried and removed the glClear command from the source-code, the display was not updated correctly.
thanks for your help
You dont have to clear the color buffer, if your rendering covers the whole screen. But you still need to clear the Z buffer, or the majority of the scene wont be rendered again after the 1st frame. Because it will be comparing the depth values of the last frame, not of a clean Z buffer.