It’s me again, I’m having an problem with selection to grid. I’m in edit mode, and I’ve selected a part of my mesh that isn’t aligned to the grid correctly, so I want to snap it to the grid. After highlighting the area I wish to snap, I press SHIFT + S and select ‘Selection to Grid’. This does work in a ‘sense’, it successfully snaps the area to the grid, however, in the process it totally messes up my selected area of the mesh as well. Making it unusable. I’ve added an image to better illustrate the problem I’m having.
You’re telling it to snap the selection of vertices to the nearest visible grid point.
Assuming from the image, what you really want is to move the selection of vertices, and the closest vertex on vertical and horizontal axis to align the visible grid. That you can do with increment snapping and activating absolute grid snapping option for it on the header. Then with active element pivot the active vertex in the selection is the one that will align the grid while moving and snapping.
