Making three vertices symmetric without moving middle vertex I'm making a shoe. It should have parts that are symmetric, and parts that are not symmetric so mirror modifier is not a good solution. I would like to make three vertices connected with 2 edges exactly symmetric with center of symmetry in the middle vertex. That middle vertex is exactly where it's supposed to be, and I want it to remain in the exact place.
What workflow could I use to make one of the vertices to be exact mirror of the second one?
You can use snap to symmetry feature.
Select vertexes that you want to move in mirrored position. Then in menu choose Mesh -&gt; Snap to Symmetry.
Then you need to adjust threshold using Adjust last operation (F9 or panel in bottom right corner)
Optionally, you can edit factor, to define what vertexes you want to move.

Then you can use X-mirror option to keep this vertexes in sync. This setting is located in 3 places: