Import-Export fbx causes rotation to go from 0 to -0.000009 #95762
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Reference: blender/blender-addons#95762
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System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89
Blender Version
Broken: version: 3.0.1, branch: master, commit date: 2022-01-25 17:19, hash:
blender/blender@dc2d180181Worked: (newest version of Blender that worked as expected)
tested in versions: 3.0.1 2.91 2.79
Short description of error
After exporting a cube or any other object into fbx and importing the same file back, an unexpected rotation transformation -0.000009 appears on the object.
Exact steps for others to reproduce the error
File > Exportmenu and select the "selected only" optionFile > Importmenu and choose the file.Added subscriber: @madjon1990
Added subscriber: @wannes.malfait
Did you mean the FBX file format? I don't know what you mean with FBH. The issue could just be something to do with floating point errors but I'm not sure.
Yes fbx format. Yes with floating point error I think.
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Can confirm. I don't know if this is expected/unavoidable behaviour. Could any of the developers confirm this?
Export an unexpected rotation transformation -0.000009to Import-Export fbx causes rotation to go from 0 to -0.000009Added subscriber: @deadpin
Changed status from 'Needs Developer To Reproduce' to: 'Archived'
Right, this is due to floating point inaccuracy from the FBX exporter/importer rotating the object from Blender's Z-up, Y-forward rotation to the rotation specified in the Export settings which is by default Y-up, -Z-forward.
If you change the Export settings to use Z-up, Y-forward and re-import that, you won't see the error (at least with this simple setup). Though other software which uses a different rotation scheme might see a similar deviation.