Apologies, I'm sure this question has been answered before, but so far I have not found a solution that works in my situation.
I have a path that my camera follows and a second path that my camera focus object follows. Neither path uses the Animate Path button nor have I parented either to their path with 'CTRL-P'. Instead I keyframed the offset of the camera and the focus object to gradually accelerate/decelerate and rapidly accelerate/decelerate at different locations along their respective paths.
When I tried to combine keyframing the offsets together with Animate Path/parenting, the camera's location would leave the path, etc.
According to the Blender Manual, the Clamp To constraint does not allow for object rotation, so using that to keep my camera on it's path is not an option.
Now I want to roll the camera 90 degrees along a specific section of it's path, while still tracking my camera focus object. When I select the camera and press 'R' or 'RR' and then 'Y' or 'YY' (or X or Z) the camera's location rotates off the path in a huge circle. When I select the camera focus object and try the same hotkeys, the camera does not rotate at all. If I use Numpad-0 to see the camera's perspective while rotating, it makes no difference.
Camera Follow Path constraints:
Fixed Position: Checked
Follow Curve: Unchecked
Curve Radius: Unchecked
Camera Track To constraints:
Target Z: Checked
Space: World Space <-> World Space
Weather Target Z is checked or unchecked and Space is World Space or Local space makes absolutely no difference. The results are the same.
I would greatly appreciate any help. Thank you.