I'm trying to make a camera in OpenGL wich follows an object, and i have implemented it like this:
The camera stores a vector wich represent an "offset" from the object to the camera. For example, if that vector is (0,0,-5), the camera will be 5 units behind the object.
Then I assign the object's rot to the camera's rot (all rotations are in quaternions), then I rotate the offset vector with the object's rotation, and I add the rotated offset to the camera's pos. That works fine for the camera position relative to the object. For the rotation, I use a lookAt function that takes the origin as the camera's pos, and the inverse of the rotated offset vector as the target object. This works fine too, except for one little problem:
when the camera is almost exactly below (or above) the object, but a little to the left, it is like this:
and when it's also almost below, but a bit to the right, I want it to behave like this:
But instead, i get this:
And I can't solve this problem, I've thought of adding 180 degrees of rotation in the cameras look vector when it's needed (in the second case), but that generates a problem In other situtations, when the object is rotated in a way that requires the camera to behave in the third image's way. What solution do you think is better to solve this problem?
