Exporting a valid GLTF (was valid before import) causes GLTF validation errors #79104

New Issue

Jonathan Clark · 2020-07-20T09:40:49+02:00

Jonathan Clark commented

2020-07-20 09:40:49 +02:00

System Information
Operating system: Linux-4.15.0-96-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: Mesa DRI Intel(R) UHD Graphics 620 (KBL GT2) Intel Open Source Technology Center 4.6 (Core Profile) Mesa 20.0.8

Blender Version
Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: 239fbf7d936f, type: Release
Also Broken: version: 2.83.0

Short description of error
I've imported a GLTF that passed the GLTF validator without any problems. Once I export, without doing any modifications, I receive GLTF validation errors:

"code": "ACCESSOR_VECTOR3_NON_UNIT",
"message": "Vector3 at accessor indices 116049..116051 is not of unit length: 0.",
"severity": 0,
"pointer": "/meshes/1/primitives/0/attributes/NORMAL"

Exact steps for others to reproduce the error

Import GLTF file
Select only the hierarchy of the imported object
Export GLTF while selecting 'Selected Objects' in Include
Test the GLTF in a GLTF validator: https://github.khronos.org/glTF-Validator/

Attached the GLTF:
315012_GLTF.zip

**System Information** Operating system: Linux-4.15.0-96-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: Mesa DRI Intel(R) UHD Graphics 620 (KBL GT2) Intel Open Source Technology Center 4.6 (Core Profile) Mesa 20.0.8 **Blender Version** Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: 239fbf7d936f, type: Release Also Broken: version: 2.83.0 **Short description of error** I've imported a GLTF that passed the GLTF validator without any problems. Once I export, without doing any modifications, I receive GLTF validation errors: "code": "ACCESSOR_VECTOR3_NON_UNIT", "message": "Vector3 at accessor indices 116049..116051 is not of unit length: 0.", "severity": 0, "pointer": "/meshes/1/primitives/0/attributes/NORMAL" **Exact steps for others to reproduce the error** 1. Import GLTF file 2. Select only the hierarchy of the imported object 3. Export GLTF while selecting 'Selected Objects' in Include 4. Test the GLTF in a GLTF validator: https://github.khronos.org/glTF-Validator/ Attached the GLTF: [315012_GLTF.zip](https://archive.blender.org/developer/F8708441/315012_GLTF.zip)

Jonathan Clark commented

2020-07-20 09:40:49 +02:00

Added subscriber: @jclarkk

Germano Cavalcante commented

2020-07-21 20:46:02 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-07-21 20:46:02 +02:00

Does this have anything to do with the problem reported in https://github.com/KhronosGroup/glTF-Blender-IO/issues/372 ?

Julien Duroure commented

2020-07-23 07:42:22 +02:00

Added subscriber: @JulienDuroure

Julien Duroure commented

2020-07-23 07:42:22 +02:00

Note: Ticket created upstream to follow the subject: https://github.com/KhronosGroup/glTF-Blender-IO/issues/1138

Confirmed the bug, and confirmed that this is linked to https://github.com/KhronosGroup/glTF-Blender-IO/issues/372
Importing using the new option merging vertices solved the issue also

Note: Ticket created upstream to follow the subject: https://github.com/KhronosGroup/glTF-Blender-IO/issues/1138 Confirmed the bug, and confirmed that this is linked to https://github.com/KhronosGroup/glTF-Blender-IO/issues/372 Importing using the new option merging vertices solved the issue also

Germano Cavalcante commented

2020-07-23 13:51:00 +02:00

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

blender-admin commented

2020-09-17 18:53:03 +02:00

This issue was referenced by 051770b36d

This issue was referenced by 051770b36de923a34a023ccd598dd315d2428f3a

Julien Duroure commented

2020-09-17 18:53:20 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Julien Duroure closed this issue

2020-09-17 18:53:20 +02:00

Julien Duroure self-assigned this 2020-09-17 18:53:20 +02:00

Jonathan Clark commented

2020-11-02 09:26:33 +01:00

I've been able to reproduce this issue in Blender 2.9.0 using the attached asset. I've tried using the 'Merge vertices' option as well and it didn't help.

@JulienDuroure
@mano-wii

28798_GLTF.zip

I've been able to reproduce this issue in Blender 2.9.0 using the attached asset. I've tried using the 'Merge vertices' option as well and it didn't help. @JulienDuroure @mano-wii [28798_GLTF.zip](https://archive.blender.org/developer/F9164829/28798_GLTF.zip)

Julien Duroure commented

2020-11-02 10:20:22 +01:00

@jclarkk This fix is not on 2.90, please test with 2.91 beta

Jonathan Clark commented

2023-03-14 13:26:04 +01:00

@JulienDuroure
I'm able to reproduce this issue with Blender 3.2.0 and while using the "Merge vertices" option in the GLTF importer.

Attached a zip file with the asset that is able to reproduce.

Simply import while selecting "Merge vertices" (Also happens without) and then export it again and you will receive GLTF validation errors.

@JulienDuroure I'm able to reproduce this issue with Blender 3.2.0 and while using the "Merge vertices" option in the GLTF importer. Attached a zip file with the asset that is able to reproduce. Simply import while selecting "Merge vertices" (Also happens without) and then export it again and you will receive GLTF validation errors.

scale_gltf_not_valid.zip

26 MiB

Jonathan Clark reopened this issue

2023-03-14 13:26:05 +01:00

Blender Bot added

and removed

labels 2023-03-14 13:26:09 +01:00

Jonathan Clark commented