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I have a problem because one arm in my human armature doesn't want to flip correctly:

enter image description here

as you can see left arm position is invalid, what can cause that issue?

model: https://www.dropbox.com/s/7cez1pub1z78468/hero_test.blend?dl=0

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Ok, it seem a problem with roll of your UpperArm_L bone, it isn't mirror of its counterpart.

  1. Go to edit mode of your armature.
  2. Select the UpperArm_L Bone.
  3. Click the Bone tab.
  4. set the Roll from -162.7d to 39.86d.
  5. This would offset all child bones, do the above changes to roll for Forearm_L(35.73d), then WristIK_L(49.01d), then Wrist_L(50.17d) copy the negative of Right side roll. (Do it in said order)
  6. All set to go.
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  • $\begingroup$ But, my hand now is weird rotated, and if I correct that to don't have to do it in every animation, flip will not work. What I can do to set correct rotation and have valid x-flip? $\endgroup$
    – TKK
    Aug 1 '17 at 6:28
  • $\begingroup$ can you show a screenshot, it seem to work fine in my case? $\endgroup$ Aug 2 '17 at 12:07
  • $\begingroup$ The roll value in my bone was set to -49.01d, am I watching something else? WristIK_R>Bone>Roll $\endgroup$
    – TKK
    Aug 2 '17 at 12:48
  • $\begingroup$ Ok, I see UpperArm_R roll to be -39.86d, but UpperArm_L is -162.7d, change that to "39.86d" also change the "Forearm_L, then WristIK_L, then Wrist_L" roll in that order ... it works now (sorry didn't see multiple IK on hand), Ill change the answer to reflect the change. Can i know the idea behind why you did rig the character this way? I have seen either no IK on hand or only one IK on forearm, not on both forearm and upper arm. $\endgroup$ Aug 3 '17 at 6:09
  • $\begingroup$ Sorry but I don't understand you in part of your comment where are you talking about my weird IK setup. I am new to IK and this setup I was making from a course, what can I improve here? $\endgroup$
    – TKK
    Aug 3 '17 at 15:29

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