Fix symmetry before retopology Given a model that was symmetrical but who now no longer is. Is there a way to delete half the model and remirror or to straighten the symmetry out.



You can see in orthographic mode that the top (and front) of the model now no longer aligns with the z axis but the middle does.

There is a multi res modifier on it at the moment in case that makes any difference.
Try this:


This will almost certainly screw up your Multires modifier, so apply it.
Select a vertex on the one half—say the left one—and hit Ctrl+L to select everything connected to it.
Delete it with X.
Move the boundary of the top section to align with the Z-axis.


You can try SX0 and then setting X to 0 in the transform properties, you'll probably still have some cleanup to do even if you use proportional editing.

Go out of edit mode and use a mirror modifier. (If I remember correctly, there's a Remove Doubles option you should use.)