You have to rebuild the mesh. (check out clearSurfaces)
Or another way is to just 'diable' those verts by off-setting them off screen. And then bringing 'em back when in use. I'd do that probably..be much faster unless it's a polys. but grid based..worth a shot.
Or another way is to just 'diable' those verts by off-setting them off screen. And then bringing 'em back when in use. I'd do that probably..be much faster unless it's a polys. but grid based..worth a shot.