The "unity animation rotation problem" is typically caused by a few common issues.
Interpolation Issues: Unity uses Quaternion for rotations, and when combining or interpolating between quaternions, you may experience unexpected results due to the mathematical complexity involved.
Gimbal Lock: This happens when two of the three gimbal circles in a system align, leading to loss of one degree of freedom (rotation axis). In practice, it can cause strange rotation behaviors.
Mismatched Rotation Systems: If your game objects use different rotation systems — for example, one using Euler angles and another using Quaternions — this can lead to unexpected rotation behavior.
Improper Animation Keyframes: If the keyframe sequences in your animation are set up incorrectly, specifically for rotation, you might see erratic or unwanted rotation behavior.
Here are potential solutions for the aforementioned causes of the error:
Correct Interpolation: Ensure that you're using
Quaternion.Lerp methods for quaternion interpolation, as these handle the nuances of quaternion math.
Avoid Gimbal Lock: Use Quaternion instead of Euler angles for rotations to avoid the possibility of Gimbal lock.
Uniform Rotation Systems: Ensure that all game objects participating in the animation use the same rotation system, preferably Quaternion.
Proper Animation Keyframes: Review your animation keyframes and ensure they are correctly configured. Check for consistency in rotation values and avoid large jumps between adjacent keyframes.
For complex animation problems, consider using Unity's animation tools like the Animation window and Animator component, which provide a more visual and intuitive way to design and troubleshoot animations.