OpenGL rotating a camera around a point

Question

In OpenGL I\'m trying to rotate a camera around a point, with camera being distance r from the point and facing the point when it rotates. In other words, I want the camera

Answer 1

You need to either:

• rotate the camera around the origin and then translate it (*)

or:

• use gluLookAt to keep the camera pointing at the center of the circle

(*) rotation functions normally rotate about the origin. To rotate around another point P you have to:

• translate(-P)
• rotate
• translate(P)