Crash when file is loaded in previous versions #108491

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opened 2023-06-01 05:36:03 +02:00 by Kent Davis · 13 comments

Kent Davis commented

2023-06-01 05:36:03 +02:00

System Information
Operating system: macOS-13.5-x86_64-i386-64bit 64 Bits
Graphics card: Metal API AMD Radeon Pro 575 1.2

Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-05-31 23:34, hash: 69ae7500d001
Worked: (newest version of Blender that worked as expected)

Short description of error
Lola Bunny.blend crash on Blender previous version.

Exact steps for others to reproduce the error
File is saved in 4.0

Open this file in 3.5 and prior versions (this will trigger the crash)

Crash does not happen in 3.6

Blender 4.0 copy 1 object then paste to Blender 3.4.1 crash

**System Information** Operating system: macOS-13.5-x86_64-i386-64bit 64 Bits Graphics card: Metal API AMD Radeon Pro 575 1.2 **Blender Version** Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-05-31 23:34, hash: `69ae7500d001` Worked: (newest version of Blender that worked as expected) **Short description of error** Lola Bunny.blend crash on Blender previous version. **Exact steps for others to reproduce the error** File is saved in 4.0 - Open this file in 3.5 and prior versions (this will trigger the crash) Crash does not happen in 3.6 - - - Blender 4.0 copy 1 object then paste to Blender 3.4.1 crash

Lola Bunny 3.blend

2.3 MiB

Kent Davis added the

labels 2023-06-01 05:36:03 +02:00

Kent Davis commented

2023-06-01 05:44:29 +02:00

Author

See DiagnosticReports

See DiagnosticReports

Blender-2023-05-31-204003.ips

42 KiB

Blender-2023-05-31-203038.ips

46 KiB

Blender-2023-05-31-203005.ips

39 KiB

YimingWu commented

2023-06-01 06:22:02 +02:00

Member

Seems to be BKE_mesh_legacy_convert_flags_to_selection_layers that's causing the crash.

Not sure how to approach this as newer version of blender now have a lot of data structure changes that might not be compatible with previous versions.

@Kent-Davis Try saving the file again in 3.6, and open that file in 3.5 and 3.4, it might read just fine, but lose of data is expected.

Seems to be `BKE_mesh_legacy_convert_flags_to_selection_layers` that's causing the crash. Not sure how to approach this as newer version of blender now have a lot of data structure changes that might not be compatible with previous versions. @Kent-Davis Try saving the file again in 3.6, and open that file in 3.5 and 3.4, it might read just fine, but lose of data is expected.

YimingWu added

Needs Information from User

and removed

labels 2023-06-01 06:22:26 +02:00

Kent Davis commented

2023-06-01 13:15:46 +02:00

Author

Seems to be BKE_mesh_legacy_convert_flags_to_selection_layers that's causing the crash.

Not sure how to approach this as newer version of blender now have a lot of data structure changes that might not be compatible with previous versions.

@Kent-Davis Try saving the file again in 3.6, and open that file in 3.5 and 3.4, it might read just fine, but lose of data is expected.

See my youtube: https://youtu.be/FWb_9CEZpmI

> Seems to be `BKE_mesh_legacy_convert_flags_to_selection_layers` that's causing the crash. > > Not sure how to approach this as newer version of blender now have a lot of data structure changes that might not be compatible with previous versions. > > @Kent-Davis Try saving the file again in 3.6, and open that file in 3.5 and 3.4, it might read just fine, but lose of data is expected. See my youtube: https://youtu.be/FWb_9CEZpmI

Lola Bunny 3.5.1.blend

2.1 MiB

Lola Bunny 4.0.blend

2.1 MiB

Lola Bunny 3.4.1.blend

2.1 MiB

Lola Bunny 3.6.0.blend

2.1 MiB

Kent Davis commented

2023-06-01 15:44:35 +02:00

Author

I found out Preferences on Theme then 3D Viewport and change color and Alpha number on "Face Retopology" is bug
See youtube.
for Blender 3.6 and 4.0
https://youtu.be/4zQROBJrfRQ

I found out Preferences on Theme then 3D Viewport and change color and Alpha number on "Face Retopology" is bug See youtube. for Blender 3.6 and 4.0 https://youtu.be/4zQROBJrfRQ

Pratik Borhade commented

2023-06-02 03:19:00 +02:00

Member

Hi, I don't think there is any loss of data when opened in 3.6 (correct me if I'm wrong)
You get "loss of data" message because of this commit which does not preserve forward compatibility: 2a56403cb0
(Save empty blend file in new 4.0 build. Then open it in 3.6, you'll still get the same "loss of data" warning message)

This is a breaking change. Forward compatibility is not preserved, and
the vertex and edge `bevel_weight` properties are removed. Python API
users are expected to use the attribute API to get and set the values.

I think there will be many breaking changes during the 4.0 development.

Confirming the crash report because 3.3LTS is affected.

Hi, I don't think there is any loss of data when opened in 3.6 (correct me if I'm wrong) You get "loss of data" message because of this commit which does not preserve forward compatibility: 2a56403cb0dbcbc1dfb19a9bf7e6434517cbdca9 (Save empty blend file in new 4.0 build. Then open it in 3.6, you'll still get the same "loss of data" warning message) ``` This is a breaking change. Forward compatibility is not preserved, and the vertex and edge `bevel_weight` properties are removed. Python API users are expected to use the attribute API to get and set the values. ``` I think there will be many breaking changes during the 4.0 development. Confirming the crash report because 3.3LTS is affected.

Pratik Borhade added

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labels 2023-06-02 03:19:18 +02:00

Pratik Borhade added this to the 3.3 LTS milestone 2023-06-02 03:20:34 +02:00

Pratik Borhade changed title from ~~Lola Bunny.blend crash on Blender previous version.~~ to Crash when file is loaded in previous versions

2023-06-02 03:21:50 +02:00

Kent Davis commented

2023-06-02 14:09:44 +02:00

Author

Cube is primitive object cause crash previous version.

Open Blender 4.0
Copy 1 cube.
Open Blender 3.6.0
Paste 1 cube is fine.
Open Blender 3.5.1
6 Paste 1 cube is crash guide.
Open Blender 3.4.1
Paste 1 cube is crash guide.
===========================================
Open Blender 4.0
Push the A key where mouse pint cursor area 3D Viewport.
Save Untitled.blend.
Open Blender 3.6.0
Open file Untitled.blend.
Open Blender 3.5.1
Open file Untitled.blend.
Open Blender 3.4.1
Open file Untitled.blend.
==========================================================

Don't forget about 3.6.0 and 4.0.0 is some bug of "Face Retopology" within Orthographic.
"Face Retopology within Perspective is fine use my Lola Bunny.blend Wireframe and edit mode.

@PratikPB2123 Cube is primitive object cause crash previous version. 1. Open Blender 4.0 2. Copy 1 cube. 3. Open Blender 3.6.0 4. Paste 1 cube is fine. 5. Open Blender 3.5.1 6 Paste 1 cube is crash guide. 7. Open Blender 3.4.1 8. Paste 1 cube is crash guide. =========================================== 1. Open Blender 4.0 3. Push the A key where mouse pint cursor area 3D Viewport. 4. Save Untitled.blend. 5. Open Blender 3.6.0 6. Open file Untitled.blend. 7. ![image](/attachments/ea6a59e2-ea4a-40cb-a660-fd7e4c2dea7d) 8. Open Blender 3.5.1 9. Open file Untitled.blend. 10. ![image](/attachments/c9cc243d-ca53-444d-a303-19fe63e2ff6e) 11. Open Blender 3.4.1 12. Open file Untitled.blend. 13. ![image](/attachments/9c3d327a-044a-4854-acf9-92782d505c1b) ========================================================== Don't forget about 3.6.0 and 4.0.0 is some bug of "Face Retopology" within Orthographic. "Face Retopology within Perspective is fine use my Lola Bunny.blend Wireframe and edit mode.

untitled.blend

983 KiB

276 KiB

296 KiB

293 KiB

Philipp Oeser added

and removed

labels 2023-06-07 11:36:13 +02:00

Bastien Montagne commented

2023-06-19 16:16:12 +02:00

Owner

not sure how much this is expected... @HooglyBoogly should know more about it? Iirc there was already fixes to 3.6 for this?

Setting to high priority since we need to know ASAP if this can be fixed or should be clearly documented (would hope for the former).

not sure how much this is expected... @HooglyBoogly should know more about it? Iirc there was already fixes to 3.6 for this? Setting to high priority since we need to know ASAP if this can be fixed or should be clearly documented (would hope for the former).

Bastien Montagne added

and removed

labels 2023-06-19 16:16:54 +02:00

Hans Goudey commented

2023-06-19 16:30:10 +02:00

Member

Meshes in files from 4.0 aren't compatible with 3.3. The only forward compatible version is 3.6. However, if you really need to move a mesh back to an earlier version (say 3.3), you can save in 4.0, then save in 3.6, then open in 3.3, and that should work, because 3.6 saves in the old format.

This is included in the 4.0 release notes:

The mesh format changes from previous versions are now included in the Blender file format, reducing overhead when saving files and file sizes (1b63a290c6).

Blender 3.6 can read files from 4.0, but earlier versions cannot

Meshes in files from 4.0 aren't compatible with 3.3. The only forward compatible version is 3.6. However, if you really need to move a mesh back to an earlier version (say 3.3), you can save in 4.0, then save in 3.6, then open in 3.3, and that should work, because 3.6 saves in the old format. This is included in the 4.0 release notes: > - The mesh format changes from previous versions are now included in the Blender file format, reducing overhead when saving files and file sizes (1b63a290c6). > - Blender 3.6 can read files from 4.0, but earlier versions cannot

Bastien Montagne commented

2023-06-19 16:40:22 +02:00

Owner

@HooglyBoogly I think that level of breakage (crash opening a .blend file) should way more widely/visibly communicated, imho would require a blogpost?

@HooglyBoogly I think that level of breakage (crash opening a .blend file) should way more widely/visibly communicated, imho would require a blogpost?

Bastien Montagne commented

2023-06-19 19:02:00 +02:00

Owner

OK fyi talked about how to solve this case with Dalai, Brecht, Sergey, and Ton, and the more general issue of forward versioning. Will create a design task tomorrow with some proposals to move forward.

OK fyi talked about how to solve this case with Dalai, Brecht, Sergey, and Ton, and the more general issue of forward versioning. Will create a design task tomorrow with some proposals to move forward.

Bastien Montagne added

and removed

labels 2023-06-19 19:02:18 +02:00

Bastien Montagne referenced this issue

2023-06-20 12:51:30 +02:00

How to Handle Forward Compatibility #109151

Hans Goudey commented

2023-09-07 21:14:52 +02:00

Member

Since #109151 is implemented and closed, I believe this can be too?

Since #109151 is implemented and closed, I believe this can be too?

Bastien Montagne commented

2023-09-07 21:16:33 +02:00

Owner

yes indeed, no reason to keep this open anymore.

yes indeed, no reason to keep this open anymore.

Bastien Montagne closed this issue

2023-09-07 21:16:35 +02:00

Blender Bot added

and removed

labels 2023-09-07 21:16:42 +02:00

Kent Davis commented

2023-09-07 21:28:31 +02:00

Author

@HooglyBoogly yes correct Save 4.0 document then open 3.4.1 make crash same this here and you send link there correct.

@HooglyBoogly yes correct Save 4.0 document then open 3.4.1 make crash same this here and you send link there correct.

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