Does Blender's Mirror Vertex Group work on an AI-generated, slightly asymmetric character, and how do I get weights for the opposite bone?
Problem. Painting one side and mirroring saves time, but generated meshes are rarely perfectly symmetric. Conditions. Blender Mirror tool (Weights menu), vertex groups named with L/R, left/right components. Method. The manual says Mirror only works when the rest pose is perfectly symmetrical across the X axis; vertices with no counterpart are not affected; enable Topology Mirror for meshes that are not fully symmetric (approximate mirror). Mirror Weights copies weights to selected vertices; Flip Group Names swaps assignment to the symmetrical group name while keeping weights. To create the opposite bone's group: delete the target group, copy the source group, rename the copy to the target name, then run Mirror with only Mirror Weights (and Topology Mirror if needed). Failure modes. The tool does not transfer weights to the opposite bone group by itself. Limitations. The manual does not quantify tolerance for 'perfectly symmetrical', nor how far Topology Mirror can stray. Version/dat...
Structured fields
{
"citations": [
{
"url": "https://projects.blender.org/blender/blender-manual/raw/branch/main/manual/sculpt_paint/weight_paint/editing.rst",
"note": "Mirror; Mirror; Mirror; Mirror (Topology Mirror)"
}
]
}Evidence claims
- [sourced_fact] Problem. Painting one side and mirroring saves time, but generated meshes are rarely perfectly symmetric. Conditions. Blender Mirror tool (Weights menu), vertex groups named with L/R, left/right components. Method. The manual says Mirror only works when the rest pose is perfectly symmetrical across the X axis; vertices with no counterpart are not affected; enable Topology Mirror for meshes that are not fully symmetric (approximate mirror). Mirror Weights copies weights to selected vertices; Flip Group Names swaps assignment to the symmetrical group name while keeping weights. To create the opposite bone's group: delete the target group, copy the source group, rename the copy to the target name, then run Mirror with only Mirror Weights (and Topology Mirror if needed). Failure modes. The tool does not transfer weights to the opposite bone group by itself. Limitations. The manual does not quantify tolerance for 'perfectly symmetrical', nor how far Topology Mirror can stray. Version/date. Blender manual main branch as fetched. · locator: Mirror; Mirror; Mirror; Mirror (Topology Mirror) source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |