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When designing a character, I enable symmetry. However, many operations gets harder to do with symmetry. For instance, let's say I'd like to create a belt. Then, if I extrude this:

enter image description here

I will get:

enter image description here

(see how it fails on the middle axis)

Similarly, if I scale an object where a part lies in the middle line, then this part won't touch anymore the middle line, breaking the continuity of the object.

Is there a way to apply an operation like if the selection was also done on the mirror part?

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    $\begingroup$ Make sure you have Clipping enabled in the Mirror modifier. And instead of simply extruding with E it's better to use Alt+E > Extrude Faces Along Normals. $\endgroup$
    – Gordon Brinkmann
    Commented Mar 8, 2022 at 16:36

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It looks like you're using a mirror modifier for your symmetry (there are other methods to edit symmetrically as well.) A mirror modifier has an option called "clipping". If you enable that option, it will prevent any vertices from crossing the mirror plane, and it will lock any vertices on the mirror plane to that plane:

enter image description here

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    $\begingroup$ Thanks a lot! I didn't know that clipping was also locking vertices! (Btw, I can accept the answer only in 7mn) $\endgroup$
    – tobiasBora
    Commented Mar 8, 2022 at 16:36

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