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In opengl there is one world coordinate system with origin (0,0,0).
What confuses me is what all the transformations like glTranslate, glRotate, etc. do? Do they move
objects in world coordinates, or do they move the camera? As you know, the same movement can be achieved by either moving objects or camera.
I am guessing that glTranslate, glRotate, change objects, and gluLookAt changes the camera?
All transformations are transformations on objects. Even gluLookAt is just a transformation to transform the objects as if the camera was where you tell it to be. Technically they are transformations on the vertices, but that’s just semantics.