ProportionalEditingがX-Mirrorに効かない件でとりあえずの対応策発見。これは助かる。
>Fweeb 05-Nov-11, 12:50
>
>Most of this stems from a bug report made about a month ago or so.
>It's apparently a non-trivial problem to fix x-mirror so it works
>predictably with PET... so until the time when someone can sit down
>and trudge through a proper fix, the solution for fixing the bug was
>to disable the feature. It's unfortunate.. but there is a bit
>of a workaround (works for me; some folks have had trouble
>replicating): use PET on half your mesh (x-mirror disabled),
>disable PET, enable x-mirror (and the topology mirror option),
>select the PET-edited half of your mesh, G->Esc. Upon doing so,
>the other half of your mesh should snap into place.
>Alternatively, you could pop into Sculpt mode and use the Symmetry
>options there.
http://blenderartists.org/forum/archive/index.php/t-235864.html?s=dede6d554e4844409b42d2bcfbc1d425