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I select all of the bones of my left side arm, and I copy pose with Ctrl+C

left arm bones selected

and then select the corresponding right side bones and press Ctrl+Shift+V, but get the following result of the left bones moving:

right arm bones selected, but left arm bones moved

I've also tried it with this box selected:

pose options x-axis mirror checkbox

my file:

edit: Since the problem was due to Mixamo's naming convention's not matching up with Blender's (Blender's L/R suffixes vs Mixamo's Left Right prefixes) Here's a workaround Mixamo Rig Blender Bone Naming Convention

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  • $\begingroup$ Hello could you please share your file? blend-exchange.com $\endgroup$
    – moonboots
    Commented Aug 25, 2023 at 18:48
  • $\begingroup$ @moonbots I added the .blend to the bottom of my post using your site $\endgroup$
    – mbuna
    Commented Aug 25, 2023 at 19:48

1 Answer 1

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Your bones need to be correctly named, with the suffixe .R, .L, or _R, _L. Once done on a side, delete the opposite side and Armature > Symmetrize. Also apply the rotation of the object in Object mode.

Right now, as the name are not correct, you're just copying-pasting the pose from a bone to the same bone, and as the local orientation is bad, it flips the bone to the current opposite X side.

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  • $\begingroup$ The bones were named by Mixamo after loading my mesh into their online rigger. AFAIK, they need those names in order to utilize all of the animations provided by Mixamo. Is adding L and R to the end of each bone name the only way for symmetry to work? I'm not sure what you mean that I'm "just copying-pasting the pose from a bone to the same bone." I copied from the left arm bones, then highlighted and pasted onto the right arm bones. Also, how is the local orientation bad? The X rotation on the armature is set to 90 by Mixamo as well. Not sure why. $\endgroup$
    – mbuna
    Commented Aug 26, 2023 at 3:19
  • $\begingroup$ Paste Pose Flipped will flip the pose. For a bone called bone.L for example (or bone_L or bone.left, etc, but not leftbone) it will flip the pose to the bone called bone.R. If Blender doesn't identify a bone that has the opposite suffixe the flipped pose will be assigned to the bone itself on the armature X axis, that's what happening right now. $\endgroup$
    – moonboots
    Commented Aug 26, 2023 at 7:44
  • $\begingroup$ Ok I see now, your response has opened up some better searches for a solve, but the Mixamo facet is another subject, so I think your answer satisfies my question. Thanks for your help with my first stack question ever haha $\endgroup$
    – mbuna
    Commented Aug 26, 2023 at 18:46

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