FBX Export Breaks Bone Roll Values - Simple Example #83531

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masteve · 2020-12-08T00:31:04+01:00

masteve commented

2020-12-08 00:31:04 +01:00

System Information
Operating system: Windows 7 64 Bit
Graphics card: GTX 2080

Blender Version
Broken: 2.8.3
Worked: Unknown

Short description of error
I have an example blend file where if you export as FBX and reimport as FBX, the roll value on the bone changes.

Exact steps for others to reproduce the error
roll_broken.blend

SK_Linda_Seragam_3_Set.psk

Install and enable this 3rd party PSK importer addon (I don't think this causes the issue but just in case) https://github.com/Befzz/blender3d_import_psk_psa
Import the psk file I have attached above, with these import settings:

"All" selected at the top
Reorient Bones: unchecked
Split UV data: unchecked
Don't invert root bone: checked
Scale down: checked
sRGB vertex color: checked
Bone length ratio: 0.40
Alt. bone length.: 5.00

Inspect the bone "b_human_-Pelivs", its roll is -90.
Export the file as FBX, all default settings.
Close and re-open Blender. Delete the cube. Import the FBX file you exported, all default import settings.
Inspect the bone "b_human_-Pelivs", its roll is -33.

**System Information** Operating system: Windows 7 64 Bit Graphics card: GTX 2080 **Blender Version** Broken: 2.8.3 Worked: Unknown **Short description of error** I have an example blend file where if you export as FBX and reimport as FBX, the roll value on the bone changes. **Exact steps for others to reproduce the error** [roll_broken.blend](https://archive.blender.org/developer/F9490789/roll_broken.blend) [SK_Linda_Seragam_3_Set.psk](https://archive.blender.org/developer/F9525630/SK_Linda_Seragam_3_Set.psk) 1. Install and enable this 3rd party PSK importer addon (I don't think this causes the issue but just in case) https://github.com/Befzz/blender3d_import_psk_psa 2. Import the psk file I have attached above, with these import settings: - "All" selected at the top - Reorient Bones: unchecked - Split UV data: unchecked - Don't invert root bone: checked - Scale down: checked - sRGB vertex color: checked - Bone length ratio: 0.40 - Alt. bone length.: 5.00 3. Inspect the bone "b_human_-Pelivs", its roll is -90. 4. Export the file as FBX, all default settings. 5. Close and re-open Blender. Delete the cube. Import the FBX file you exported, all default import settings. 6. Inspect the bone "b_human_-Pelivs", its roll is -33.

masteve commented

2020-12-08 00:31:04 +01:00

Added subscriber: @masteve

Richard Antalik commented

2020-12-22 12:15:10 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-12-22 12:15:10 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-12-22 12:15:10 +01:00

I can't reproduce this - in step 2 roll is -33.

Does this happen when you click on File > Defaults > Load Factory Settings?
Also please check if this happens with latest alpha from https://builder.blender.org/download/

I can't reproduce this - in step 2 roll is -33. Does this happen when you click on File > Defaults > Load Factory Settings? Also please check if this happens with latest alpha from https://builder.blender.org/download/

masteve commented

2020-12-22 18:40:54 +01:00

You're right, I downloaded the file and see the same thing. So just the act of me saving the blend file cause the roll to change. I'll send an update.

masteve commented

2020-12-22 18:56:14 +01:00

Maybe trying to simplify the process too much was a bad idea. I thought I had it pinned down, but here's the full process.

SK_Linda_Seragam_3_Set.psk

Install and enable this 3rd party PSK importer addon (I don't think this causes the issue but just in case) https://github.com/Befzz/blender3d_import_psk_psa
Import the psk file I have attached above, with these import settings:

"All" selected at the top
Reorient Bones: unchecked
Split UV data: unchecked
Don't invert root bone: checked
Scale down: checked
sRGB vertex color: checked
Bone length ratio: 0.40
Alt. bone length.: 5.00

Inspect the bone "b_human_-Pelivs", its roll is -90.
Export the file as FBX, all default settings.
Close and re-open Blender. Delete the cube. Import the FBX file you exported, all default import settings.
Inspect the bone "b_human_-Pelivs", its roll is -33.

Maybe trying to simplify the process too much was a bad idea. I thought I had it pinned down, but here's the full process. [SK_Linda_Seragam_3_Set.psk](https://archive.blender.org/developer/F9525630/SK_Linda_Seragam_3_Set.psk) 1. Install and enable this 3rd party PSK importer addon (I don't think this causes the issue but just in case) https://github.com/Befzz/blender3d_import_psk_psa 2. Import the psk file I have attached above, with these import settings: - "All" selected at the top - Reorient Bones: unchecked - Split UV data: unchecked - Don't invert root bone: checked - Scale down: checked - sRGB vertex color: checked - Bone length ratio: 0.40 - Alt. bone length.: 5.00 3. Inspect the bone "b_human_-Pelivs", its roll is -90. 4. Export the file as FBX, all default settings. 5. Close and re-open Blender. Delete the cube. Import the FBX file you exported, all default import settings. 6. Inspect the bone "b_human_-Pelivs", its roll is -33.

masteve commented

2021-01-08 21:30:48 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Pratik Borhade commented

2022-01-24 06:29:40 +01:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-01-24 06:54:48 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Pratik Borhade commented

2022-01-24 06:54:48 +01:00

Hi, I can not reproduce with your given steps on 3.1.0
With the initial .blend file, roll is -33 for me as well
Then with PSK addon I checked, it shows roll -90 but exporting and importing back to FBX made no difference to its roll.
Can you check if it's still the case for you on recent blender versions?: https://builder.blender.org/download/daily/

Hi, I can not reproduce with your given steps on 3.1.0 With the initial .blend file, roll is -33 for me as well Then with PSK addon I checked, it shows roll -90 but exporting and importing back to FBX made no difference to its roll. Can you check if it's still the case for you on recent blender versions?: https://builder.blender.org/download/daily/

Robert Guetzkow commented

2022-04-27 11:47:45 +02:00

Added subscriber: @rjg

Robert Guetzkow commented

2022-04-27 11:47:45 +02:00

Changed status from 'Needs User Info' to: 'Archived'

Robert Guetzkow closed this issue

2022-04-27 11:47:45 +02:00

Robert Guetzkow commented

2022-04-27 11:47:45 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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