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I'm a bit confused with the X Mirror option and how you're supposed to copy weight paints from one side to the other. Is X Mirror supposed to work by painting the opposite side automatically as you paint the other? Or am I misunderstanding how it works. Either way, it doesn't appear to do much for me. Failing that, how am I supposed to copy my weight paints from one side to the other?

Thanks

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3 Answers 3

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x-mirror in weight paint mode is meant to mirror your actions between mirrored groups.

Let's say you have group four your right and left arm. If you paint the weights in the left arm group, x mirror will do its job on the right arm group.

In order to paint in symmetry inside a single group, you need the purposely named symmetry tool : demo pic

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  • $\begingroup$ Oh, I'm so confused... I have Vertex Groups for my two shoulders, the (character's) left shoulder has had its weight paint adjusted, the X Mirror is enabled, but it doesn't replicate it on the right shoulder. Also, I'm not getting an option for Symmetry. $\endgroup$
    – DustyShinigami
    Commented Nov 26, 2018 at 12:15
  • $\begingroup$ Are you in weight paint mode? $\endgroup$
    – Lauloque ♦
    Commented Nov 26, 2018 at 12:28
  • $\begingroup$ Yeah, I am. ... $\endgroup$
    – DustyShinigami
    Commented Nov 26, 2018 at 13:05
  • $\begingroup$ provide your .blend file then. $\endgroup$
    – Lauloque ♦
    Commented Nov 26, 2018 at 13:49
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    $\begingroup$ Curious, it works for me. Maybe try enabling topology mirror in the options tab ? $\endgroup$
    – Lauloque ♦
    Commented Nov 27, 2018 at 13:19
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As far as I can understand, X-Mirror does NOT work retroactively! You have to have it active before doing any weight painting.

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The only problem is that your model is rotated 90 degrees on the Z axis, also the scale is not 1.0 but the skeleton scale is 1.0, which might make it not work properly. It worked perfectly for me after I applied all the transforms (Rotation, Location, Scale), as a plus I did a symmetrize because the model is not perfectly symmetrical and finally I checked for any unwelded vertex.

Hope that helps.

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