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I don't really understand this behavior :

All is done in object mode. Here are 6 identical shapes, from top to bottom rotated around the Y axis, respectively 0, -45, -90, -135, -180 and -225°.

Now I scale them -1 with 3D cursor as pivot and along the X axis (shapes on the right are 'witness') :

enter image description here

Now, the scaled shapes, from top to bottom (all kept their original rotation around Y) :

  • 1 : scale X = -1, effectively mirrored (like from a mirror)
  • 2 : scale X = -1, but not mirrored ?
  • 3 : scale Z = -1, and appears mirrored
  • 4 : scales X and Z = -1, not mirrored ?
  • 5 : scale X = -1, mirrored
  • 6 : scale X = -1, not mirrored ?

Why all that ?

Note : I don't want to obtain any particular result here (I know how to correct things if needed), but I just want to understand why it works like that.

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  • $\begingroup$ FYI, related to this developer.blender.org/T42834. Indicated as "this can be closed as a known limit." by Campbell Barton $\endgroup$ – lemon Jul 22 '16 at 11:23
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This matter because you don't apply rotation to original objects. "CTRL+A - rotation" should solve this.

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  • $\begingroup$ Thanks, but this is not the point, for me : the question is "why" (as I told in the note at the end of the question, I know how to obtain what I want in that matter). But I am questioning here to understand why these results are so counter intuitive. $\endgroup$ – lemon Jul 16 '16 at 8:45

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