I am sculpting a character, and I want edit an area in the near from the middle of the x-axis. But this area is not good to see, also I want select and hide the left half of the body first (with Ctrl+shift alt in front view). After the editing I want recreate the symmetrie with the button “Deformation->Smart ReSym”. The condition is, I must select exactly the left half of the body for hiding, otherwise the “Smart ReSym” does not works correctly.
How can I select exactly the left half body along the y-axis?