Godot exporter crashes blender when exporting twice with mesh in edit mode #73174

New Issue

Ryan · 2020-01-16T22:30:42+01:00

Ryan commented

2020-01-16 22:30:42 +01:00

System Information
Operating system: Linux-5.4.10-arch1-1-x86_64-with-glibc2.29 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.44

Blender Version
Broken: version: 2.81 (sub 16), branch: makepkg, commit date: 2019-12-04 11:32, hash: f1aa4d18d4
Worked: (optional)

Short description of error
Blender crashed after trying to export a scene using the https://github.com/godotengine/godot-blender-exporter/ plugin.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

File > Export > Godot Engine. Pick a location inside a godot project directory and confirm.
You'll get an error about the mesh being in edit mode
File > Export > Godot Engine. Confirm again.
Blender crashes.

World.blend

system-info.txt

World.crash.txt

**System Information** Operating system: Linux-5.4.10-arch1-1-x86_64-with-glibc2.29 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.44 **Blender Version** Broken: version: 2.81 (sub 16), branch: makepkg, commit date: 2019-12-04 11:32, hash: `f1aa4d18d4` Worked: (optional) **Short description of error** Blender crashed after trying to export a scene using the https://github.com/godotengine/godot-blender-exporter/ plugin. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] 1. File > Export > Godot Engine. Pick a location **inside a godot project directory** and confirm. 2. You'll get an error about the mesh being in edit mode 3. File > Export > Godot Engine. Confirm again. 4. Blender crashes. [World.blend](https://archive.blender.org/developer/F8282174/World.blend) [system-info.txt](https://archive.blender.org/developer/F8282173/system-info.txt) [World.crash.txt](https://archive.blender.org/developer/F8282172/World.crash.txt)

Ryan commented

2020-01-16 22:30:42 +01:00

Added subscriber: @rcorre-3

Julien Duroure commented

2020-01-17 11:11:33 +01:00

Added subscriber: @JulienDuroure

Julien Duroure commented

2020-01-17 11:11:33 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Julien Duroure closed this issue

2020-01-17 11:11:33 +01:00

Julien Duroure self-assigned this 2020-01-17 11:11:33 +01:00

Julien Duroure commented

2020-01-17 11:11:33 +01:00

Hello,

This code is not part of Blender, please open a bug report directly on addon issue tracker: https://github.com/godotengine/godot-blender-exporter/

Thanks!

Hello, This code is not part of Blender, please open a bug report directly on addon issue tracker: https://github.com/godotengine/godot-blender-exporter/ Thanks!

Philipp Oeser commented

2020-01-17 11:23:27 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-01-17 11:23:27 +01:00

This looks like some sort of corrupted file.
(Havent figured it out yet, but modeswitching has some issues in there -- so on these objects, you cannot actually enter editmode e.g., entering vertexpaint crashes...).

However, you can just append these objects back into a fresh file and everything seems to be fine (not getting these weird Mesh 'Grid' is in editmode errors).
World_corrected.blend

I can export do Godot then (getting another - unrelated - error, but these sort of issues should be reported to the Godot people: ah, I see you already did that.... https://github.com/godotengine/godot-blender-exporter/issues/316)

Unfortunately unless there are clear instructions on how to reproduce this "corruption" from scratch we cannot debug this any further.
(First time I see something like this, and I cannot reproduce)

Will have to close this, we have a workaround for now, and make sure to comment here again if you can provide reproduction steps to get a mesh object into this "corrupted" state (we can always reopen the report in that case...)

This looks like some sort of corrupted file. (Havent figured it out yet, but modeswitching has some issues in there -- so on these objects, you cannot actually enter editmode e.g., entering vertexpaint crashes...). However, you can just append these objects back into a fresh file and everything seems to be fine (not getting these weird `Mesh 'Grid' is in editmode` errors). [World_corrected.blend](https://archive.blender.org/developer/F8282873/World_corrected.blend) I can export do Godot then (getting another - unrelated - error, but these sort of issues should be reported to the Godot people: ah, I see you already did that.... https://github.com/godotengine/godot-blender-exporter/issues/316) Unfortunately unless there are clear instructions on how to reproduce this "corruption" from scratch we cannot debug this any further. (First time I see something like this, and I cannot reproduce) Will have to close this, we have a workaround for now, and make sure to comment here again if you can provide reproduction steps to get a mesh object into this "corrupted" state (we can always reopen the report in that case...)

Ryan commented

2020-01-17 12:41:52 +01:00

I've managed to find a reliable repro. Let me know if I should continue the discussion here, or on godot-blender-exporter, or both.
I normally report bugs in the exporter only to the exporter (as @JulienDuroure mentioned), but I figured anything that manages to completely crash blender might be of interest to the blender devs.
For the repro:

Create a cube
Create a linked duplicate (alt+d)
Parent the duplicate to the original
Select the duplicate (child)
Enter edit mode
Select the parent from the scene tree (without exiting edit mode). At this point you'll a gray frame for the cube.
Export to godot
Get "Mesh in edit mode" error
Select the child
Exit edit mode
Export again
Crash

Strangely, I've noticed this does not seem to happen if the cube has a mirror modifier on it.

I've managed to find a reliable repro. Let me know if I should continue the discussion here, or on godot-blender-exporter, or both. I normally report bugs in the exporter only to the exporter (as @JulienDuroure mentioned), but I figured anything that manages to completely crash blender might be of interest to the blender devs. For the repro: 1. Create a cube 2. Create a linked duplicate (alt+d) 3. Parent the duplicate to the original 4. Select the duplicate (child) 5. Enter edit mode 6. Select the parent from the scene tree (without exiting edit mode). At this point you'll a gray frame for the cube. 7. Export to godot 8. Get "Mesh in edit mode" error 9. Select the child 10. Exit edit mode 11. Export again 12. Crash Strangely, I've noticed this does not seem to happen if the cube has a mirror modifier on it.

Philipp Oeser commented

2020-01-17 13:42:28 +01:00

Strangely, I cannot trigger the "Mesh in edit mode" error from the repro steps (even if I have a mesh in editmode).
[using the exporter from today btw...]

The warning is blenders warning when calling bmesh.to_mesh()

Quick glimpse over the exporter shows it is doing
ob_evaluated.to_mesh(), then bmesh from that mesh, bmesh.to_mesh() to triangulate, but all seems OK to me.

Just to make sure, here is my file and the exporter settings:
#73174.blend

We should be after step 6.
exporting to godot, I dont get the error

Is this working for you?
You could also provide your file here if that helps...

Strangely, I cannot trigger the "Mesh in edit mode" error from the repro steps (even if I have a mesh in editmode). [using the exporter from today btw...] The warning is blenders warning when calling `bmesh.to_mesh()` Quick glimpse over the exporter shows it is doing ob_evaluated.to_mesh(), then bmesh from that mesh, bmesh.to_mesh() to triangulate, but all seems OK to me. Just to make sure, here is my file and the exporter settings: [#73174.blend](https://archive.blender.org/developer/F8283067/T73174.blend) ![image.png](https://archive.blender.org/developer/F8283065/image.png) We should be after step 6. exporting to godot, I dont get the error Is this working for you? You could also provide your file here if that helps...

Ryan commented

2020-01-17 14:16:48 +01:00

Sorry, this is a tricky one to repro, and it doesn't seem to be 100%.

If I open World.blend, then repeatedly try to export (up to ~10 times), blender will eventually crash.

Sorry, this is a tricky one to repro, and it doesn't seem to be 100%. If I open [World.blend](https://archive.blender.org/developer/F8283101/World.blend), then repeatedly try to export (up to ~10 times), blender will eventually crash.

Ryan commented

2020-01-17 14:20:02 +01:00

There's something about my preferences causing this. If I use blender --factory-startup, I can't repro it. With --factory-startup, I don't see that gray frame after selecting the parent. It seems that blender stays in edit mode with the mesh selected, regardless of whether I select the parent or child.

There's something about my preferences causing this. If I use `blender --factory-startup`, I can't repro it. With `--factory-startup`, I don't see that gray frame after selecting the parent. It seems that blender stays in edit mode with the mesh selected, regardless of whether I select the parent or child.

Philipp Oeser commented

2020-01-17 14:29:04 +01:00

Some Addon maybe?

Ryan commented

2020-01-17 14:51:46 +01:00

I've disabled all addons but the exporter and can still repro.

Ryan commented

2020-01-17 15:00:19 +01:00

So I can't create this from scratch with factory settings, but if you open the file from https://developer.blender.org/T73174#851823 with --factory-startup, then enable the godot exporter and repeatedly export, blender will eventually crash.

Ryan commented

2020-01-17 15:09:55 +01:00

This is the output:


[INFO]: Exporting scene: Scene
[INFO]: Exporting 2 objects
[INFO]: Exporting Blender object: Cube
find_node_operation: Failed for (TRANSFORM_FINAL, '')
add_relation(Simulation -> Final Transform) - Failed, but op_from (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_SIMULATION_INIT)) was ok
add_relation(Simulation -> Final Transform) - Could not find op_to (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_FINAL))
find_node_operation: Failed for (TRANSFORM_FINAL, '')
add_relation(Synchronize to Original) - Could not find op_from (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_FINAL))
add_relation(Synchronize to Original) - Failed, but op_to (OperationKey(type: SYNCHRONIZATION, component name: '', operation code: SYNCHRONIZE_TO_ORIGINAL)) was ok
Writing: /tmp/World.crash.txt
Segmentation fault (core dumped)

This is the output: ``` [INFO]: Exporting scene: Scene [INFO]: Exporting 2 objects [INFO]: Exporting Blender object: Cube find_node_operation: Failed for (TRANSFORM_FINAL, '') add_relation(Simulation -> Final Transform) - Failed, but op_from (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_SIMULATION_INIT)) was ok add_relation(Simulation -> Final Transform) - Could not find op_to (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_FINAL)) find_node_operation: Failed for (TRANSFORM_FINAL, '') add_relation(Synchronize to Original) - Could not find op_from (OperationKey(type: TRANSFORM, component name: '', operation code: TRANSFORM_FINAL)) add_relation(Synchronize to Original) - Failed, but op_to (OperationKey(type: SYNCHRONIZATION, component name: '', operation code: SYNCHRONIZE_TO_ORIGINAL)) was ok Writing: /tmp/World.crash.txt Segmentation fault (core dumped) ```

Ryan commented

2020-01-20 17:44:05 +01:00

Hit another one, this reproes pretty regularly tunnel.blend tunnel.crash.txt

Hit another one, this reproes pretty regularly [tunnel.blend](https://archive.blender.org/developer/F8289949/tunnel.blend) [tunnel.crash.txt](https://archive.blender.org/developer/F8289951/tunnel.crash.txt)

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Godot exporter crashes blender when exporting twice with mesh in edit mode #73174