title: Difference between Camera/Eye coordinates and world coordinates
body: <p>For the sake of simplicity let's take OpenGL rendering system as an example. According to what I have learnt,</p>
  
  <p>The camera in OpenGL is aligned with the world space's origin i.e (0,0,0). I also read that we don't move the camera so it will stay at it's original position of (0,0,0) in world coordinates. The camera faces in the negative z direction.</p>
  
  <p>Thus the question is, if <strong>you don't move the camera then it will always stay at world space's origin of (0,0,0)</strong>. If that's the case then there will be no difference between world and eye coordinates. Because for example, Object A position in world coordinates is (2,2,-5). In eye coordinates it will be the same <code>(2-0, 2-0, -5-0) = (2,2,-5)</code> </p>