Mixed bones

I ran into a problem with Mixamo which I think has two solutions:

As you can see, the foot bones are misaligned, and the lower leg bone is visibly smaller than the upper. The first solution I could think of was to fix the bones manually and ask if that was okay. The other solution is to delete the armature and adjust my duck so Mixamo can put the bones properly.

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The third option is to delete the bad side of bones and “symmetrize”.

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In other words, fix half, delete half, and then symmetrize. But what about the parenting? How are the bones parented in Mixamo?

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The symmetrize thing is not working:

W.D.I.D.?

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Do you mean weight painted …

Mixamo is basically a animation asset, where a bone is manipulated over time.
If I can remember correctly, you will map (in Mixamo), your Blender bone to the Mixamo bone.
This means also you need to have the same bone structure (number of bones)

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Symmetrize works only, when name your bones correctly!

Blender notation: any.name.L or any.name.R

If you delete the .L side, Blender will copy the .R bone (mirror) and rename it to .L

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I asked ChatGpt about this problem, knowing it would give me several solutions. Its number one answer is the naming convention, which I thought I had to go through all the bones in the outliner to rename. So I thought this was the wrong answer until yours came along. So I renamed only the legbones and hey presto it worked.

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