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I got a model from SketchUp, and imported it into Blender to modify it. It was just half the figure, meant in the end to be mirrored to have it be completed, and when I initially imported it into Blender it was lined up perfectly so that both the nose and tail were nicely aligned at x axis 0.

Through the course of working on it however I must have accidentally rotated it off center. I want to duplicate the left side so that I can mirror it and then merge these two halves, but I need to have that center loop of the figure uniformly on x axis 0. How do I get it squared up again?! See how it's been tilted off center?

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  • $\begingroup$ Andy, since Jerryno's answer solved your problem, please mark it as the "Accepted Answer". $\endgroup$ Apr 19, 2017 at 1:17

1 Answer 1

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  1. Close the shape with ngon:

    enter image description here

  2. Add Empty to the scene, enable snapping, set to face, enable align orientation and snap the empty to the ngon:

    enter image description here

  3. Parent the mesh to the empty: Select mesh, select empty, Ctrl+P

  4. Reset the rotation of empty with Alt+R

  5. Clear parent (Alt+P) and Keep the transform. Now your mesh is aligned with world coords.

  6. Delete Empty, delete ngon, rotate mesh to the axis you want.

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  • $\begingroup$ Why create a ngon, step 1 and 6 aren't necessary, can snap to edge. $\endgroup$
    – iKlsR
    Feb 16, 2015 at 19:12
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    $\begingroup$ @iKlsR what if the seam isn't completely flat? Best would be to add also step 7: scale the seam to 0. $\endgroup$ Feb 16, 2015 at 19:37
  • $\begingroup$ That did it. Thanks for the very descriptive response. $\endgroup$
    – Andy
    Mar 1, 2015 at 13:35

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