Quote:

---

After pressing the right mouse button, the camera and the center of the screen
(or the focal point) should pan in x and y, following the mouse movements.

---

I've read this sentence several times still don't really get what you
want. Is it move the camera left/right/forward/backward and still looking at
worldCenter?

Have you already solved the problem of zoom in/out and orbit the camera?

Sorry if I'm misunderstanding you, it's been 3:00AM here, I need
some sleep.