Hi everyone,
I’m having a strange IK issue with my arm rig.
When I enter Pose Mode and rotate ROOT.upper with R, the elbow suddenly bends in the opposite direction at a certain angle. It doesn’t flip 180° anymore, but there is still a clear point where the elbow abruptly changes direction.
I tested the same motion on several other character rigs, and their elbows remain very stable. So I believe there is something wrong with my rig rather than Blender itself.
I’ve already spent a long time checking, but I still can’t find the cause.
I’ve attached a simplified .blend file containing only the armature.
Since I’m a new user, I can’t upload attachments yet.I’ve uploaded the .blend file here:
If anyone could take a look and point out what I’m doing wrong, I would really appreciate it.
To reproduce the issue:
- Open the file.
- Enter Pose Mode.
- Select ROOT.upper.
- Press R and rotate it.
- Watch the elbow suddenly change direction at a certain angle.
Thank you very much!