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An object that has 0 rotations displays the local axis that's not aligned to the global axis.

Please see the following picture.

Weird local axis rotation

All parent objects have 0 rotations.

How can I re-align the local axis to the global axis?

The object itself has a few child objects, and that child objects' local axis and rotations must not be changed.

Blender version is 2.19.0.

UPDATE 1:

The object and it's parents' delta transform rotations are all 0 too.

enter image description here

UPDATE 2:

I've included the blender file that has the problem - using Blend-Exchange (Please see 'Front Arm' object):

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I couldn't figure out where did the rotation come from.

Only Clear parent of object, Apply rotation then Set parent back lead to the desired result.

https://youtu.be/jkcoP4RKSnw

an interesting question - how did it happen? I hope the topic will continue

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  • $\begingroup$ Thank you! It works. BTW, I tried to see the properties of the object with python script. With the object selected, I printed bpy.context.object.matrix_local. The 'shape' of the matrix values were somewhat different from the other object - maybe the rotation was included. $\endgroup$
    – zeodtr
    May 5 at 11:46
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Besides primary transformations blender has Delta Transform which useful in some cases.

It's located in Properties > Object > Transform > Delta Transform:

Delta Transform

You can transfer primary transformations to deltas by applying them:

apply Delta

Blender hasn't Apply Delta Transform operator. You can only copy Delta transform to primary manually, reset deltas to default then Apply main transform to data.

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  • $\begingroup$ Thank you. But the object's delta transform rotations are all 0 too. I've updated my question. $\endgroup$
    – zeodtr
    May 5 at 8:14
  • $\begingroup$ May be it transformed with armature poses? $\endgroup$
    – RUben
    May 5 at 9:14
  • $\begingroup$ I didn't do any rigging. (BTW, I use Blender for hobby. So, my knowledge for Blender is limited.) But I used many custom transform orientations - with edge or face. $\endgroup$
    – zeodtr
    May 5 at 9:20
  • $\begingroup$ Can you share your blend file or copy & paste only problem object to new file and share it? my guesses are over $\endgroup$
    – RUben
    May 5 at 9:26
  • $\begingroup$ I've shared the blender file using Blend-Exchange. Please see UPDATE 2. Thank you. $\endgroup$
    – zeodtr
    May 5 at 10:07

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