vertex color attibutes doesnt export correctly with glb/gltf (4.1.0) #105278

New Issue

Pratik Borhade · 2024-04-12T07:36:33+02:00

Pratik Borhade commented

2024-04-12 07:36:33 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.58

Blender Version
Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: 40a5e739e270
Worked: (newest version of Blender that worked as expected)

Short description of error

Blender doesnt export correctly vertex colors attributes using glb/gltf format .

Exact steps for others to reproduce the error

Open an scene with a complex model with vertex paint colors , export as *.glb file .Open a fresh scene and to load the exported file .Boom the color attributes are gone.Also tested in another apps its the same .
I tried with 4.1.1 (4/11/24 ) and its the same situation , but with blender 4.0 gltf export works fine .

VertexColorGLTF.blend

Originally reported at: #120544

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.58 **Blender Version** Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: `40a5e739e270` Worked: (newest version of Blender that worked as expected) **Short description of error** Blender doesnt export correctly vertex colors attributes using glb/gltf format . **Exact steps for others to reproduce the error** Open an scene with a complex model with vertex paint colors , export as *.glb file .Open a fresh scene and to load the exported file .Boom the color attributes are gone.Also tested in another apps its the same . I tried with 4.1.1 (4/11/24 ) and its the same situation , but with blender 4.0 gltf export works fine . [VertexColorGLTF.blend](https://projects.blender.org/attachments/603cd2c6-7550-4ee4-a6f6-03badfc84926) Originally reported at: #120544

Pratik Borhade added the

labels 2024-04-12 07:36:33 +02:00

Pratik Borhade referenced this issue from blender/blender

2024-04-12 07:36:44 +02:00

vertex color attibutes doesnt export correctly with glb/gltf (4.1.0) #120544

Pratik Borhade commented

2024-04-12 07:38:00 +02:00

export_colors is removed from the export properties. That said, enabling attribute doesn't work either.
@JulienDuroure hi, maybe you want to check this. :)

`export_colors` is removed from the export properties. That said, enabling `attribute` doesn't work either. @JulienDuroure hi, maybe you want to check this. :)

Pratik Borhade added

and removed

labels 2024-04-12 07:38:14 +02:00

Pratik Borhade commented

2024-04-12 07:44:10 +02:00

Guess a4627b35cc caused this.

Guess a4627b35ccdc42825fa32822b773e5a9500792ca caused this.

Julien Duroure commented

2024-04-12 07:55:47 +02:00

Hello,
Closing this ticket, as this works as designed.
We are now exporting VC only when used in the shader node groups, avoiding exporting COLOR_0 that should always be a multiplier of base color on glTF (that is not the case in Blender)

Others VC can be exported as custom attributes.

See upstream discussion and plan for 4.2 here:
https://github.com/KhronosGroup/glTF-Blender-IO/pull/2017#issuecomment-2049925138
https://github.com/KhronosGroup/glTF-Blender-IO/issues/2195

Hello, Closing this ticket, as this works as designed. We are now exporting VC only when used in the shader node groups, avoiding exporting COLOR_0 that should always be a multiplier of base color on glTF (that is not the case in Blender) Others VC can be exported as custom attributes. See upstream discussion and plan for 4.2 here: https://github.com/KhronosGroup/glTF-Blender-IO/pull/2017#issuecomment-2049925138 https://github.com/KhronosGroup/glTF-Blender-IO/issues/2195

Julien Duroure closed this issue

2024-04-12 07:55:49 +02:00

Blender Bot added

and removed

labels 2024-04-12 07:55:50 +02:00

Pratik Borhade commented

2024-04-12 08:08:10 +02:00

Thanks @JulienDuroure . So gltf team is planning to bring back "exporting vc without shader node group" in future (maybe in 4.2)?

I checked the changelog of gltf in release notes but didn't find any info about "Export Vertex Color only when used in shader node tree". Maybe good to mention here: https://developer.blender.org/docs/release_notes/4.1/add_ons/#gltf-20 🙂

Thanks @JulienDuroure . So gltf team is planning to bring back "exporting vc without shader node group" in future (maybe in 4.2)? I checked the changelog of gltf in release notes but didn't find any info about "Export Vertex Color only when used in shader node tree". Maybe good to mention here: https://developer.blender.org/docs/release_notes/4.1/add_ons/#gltf-20 🙂

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