When I try to change the direction a camera is pointed, it often changes the relative orientation of the z axis. I can't keep the global z axis "vertical" from the perspective of the camera. I want to be able to turn the camera left, right, up, down, but without rolling.
You don't tilt your head whenever you turn left or right, after all.
To put it another way, I don't want the blue z-axis line to tip left or right on my screen when angling a camera. How do I prevent this?
Thanks in advance.