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Can one symmetrize (eg. -X to +X after making a selection in Edit mode and pressing W - pressing Symmetrize) along a custom transform orientation? I have selected my orientation Custom, but when I symmetrize it is done according to global transform orientation.

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  • $\begingroup$ How are you symmetrizing it? $\endgroup$ – SilverWolf - Reinstate Monica Aug 30 '17 at 20:25
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    $\begingroup$ I don't believe you can since the custom transform is for simple manipulation (TRS). However, you can always align your object with the axis you want to symmetrize along and then after symmetrizing, rotate it back. $\endgroup$ – bertmoog Aug 30 '17 at 20:55
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    $\begingroup$ Interactive mirror (Ctrl+M) will work based on transform orientations, custom ones as well. But it mirrors only, so one needs to duplicate data before mirroring if original is required untouched. $\endgroup$ – Mr Zak Aug 30 '17 at 22:41
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For now at least, it seems that the Symmetrize algorithm is based on the object's Local Axis and the Object Origin regardless of the Orientation or the Pivot selection.

enter image description here

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  • $\begingroup$ This is the way I approached this, thank you for clarifying. $\endgroup$ – JakeTheSnake Sep 3 '17 at 16:11
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    $\begingroup$ @JakeTheSnake - No problem at all. Glad it helped you $\endgroup$ – bertmoog Sep 6 '17 at 19:25
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It works fine for me. I guess it's the matter of the proper placing of the object's origin point. enter image description here

You may also try mirroring with Empty. In Edit Mode select the face you want to add a custom transformation to, press Shift+Alt+Spacebar to set it. Then press Shift+Num 7 to allign the face to view. Enter Object Mode, add an Empty and check the Align to View checkbox. Add a Mirror Modifier and set the Empty as a mirror object's target. Now translate the Empty or the object along your custom transformation. enter image description here enter image description here

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  • $\begingroup$ I guess rotation isn't applied to the cube in the first gif? Mirror or Symmetrize will work based on global axes so once rotation is applied one should hack it somehow, e.g. with the second gif $\endgroup$ – Mr Zak Aug 30 '17 at 22:25
  • $\begingroup$ Mirroring doesn't do the same thing as symmetrizing. Can you show an example of the symmetrize function working with a custom orientation? $\endgroup$ – bertmoog Aug 30 '17 at 22:34
  • $\begingroup$ @bertmoog You're right. Seems I misunderstood the question. Though my solution may be handy if you delete one half of the mesh and then use it (as the Mr Zak 's one with Ctrl+M). $\endgroup$ – Paul Gonet Aug 30 '17 at 22:46

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