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Let's say I want to select some vertices on the left arm of a model, I want it to also select the same vertices on the right side, the model already has both sides but without the mirror modifier

I don't want to make any new polygons/vertices

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    $\begingroup$ If the object is completely symmetrical and its origin is centred, you can select your vertices on one side, hit Ctrl-Shift-M to select the mirror and check the Extend entry on the bottom-left Operator panel which appears. $\endgroup$
    – John Eason
    Sep 22, 2023 at 10:23
  • $\begingroup$ That kind of works but if I try to move one vertex closer to the center the other one goes further, and I'd like to have it automated, is my best bet to try and cut the model in half and add a mirror modifier? $\endgroup$ Sep 22, 2023 at 10:35
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    $\begingroup$ Yes! If you have a centre edge which runs right round the model vertically, select it with the Alt key in Edge mode, hit 'V' to rip it, hover over one side of the model and hit Ctrl-L to select that side, X > Vertices to delete it then add your mirror modifier. $\endgroup$
    – John Eason
    Sep 22, 2023 at 10:44
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    $\begingroup$ Can you add an image or share your blend file via blend-exchange.com. $\endgroup$
    – John Eason
    Sep 22, 2023 at 11:13
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    $\begingroup$ Definitely not! :^( $\endgroup$
    – John Eason
    Sep 22, 2023 at 11:18

1 Answer 1

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This seems to be what I was looking for.

To use it, select an object and go into Edit Mode and you should see a butterfly icon with X,Y,Z being near it in the top right corner of the scene.

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