glTF exporter doesn't use texture color data for alpha map, only texture alpha. #105284

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Patrick · 2024-04-15T20:00:43+02:00

Patrick commented

2024-04-15 20:00:43 +02:00

System Information
Operating system: Win 11
Graphics card: RTX3070

Blender Version
Broken: 4.1
Worked: 4.0.*

Short description of error
When exporting gltf, before I could use a texture's color to use as the alpha clip, but now, it only work with the texture's alpha.

Exact steps for others to reproduce the error
Use a black and white texture as the principled BSDF's alpha value. When exporting, that black and white texture gets mapped to the albedo.

**System Information** Operating system: Win 11 Graphics card: RTX3070 **Blender Version** Broken: 4.1 Worked: 4.0.* **Short description of error** When exporting gltf, before I could use a texture's color to use as the alpha clip, but now, it only work with the texture's alpha. **Exact steps for others to reproduce the error** Use a black and white texture as the principled BSDF's alpha value. When exporting, that black and white texture gets mapped to the albedo.

alpha.blend

710 KiB

alpha color.glb

265 KiB

Patrick added the

labels 2024-04-15 20:00:43 +02:00

Julien Duroure commented

2024-04-16 05:50:51 +02:00

Hello,
Thanks for the report

In 4.0, the alpha channel was created only from Red channel of the texture.
In 4.1, no alpha is generated.
Agree that the behavior changed. Was not right, and still is not right, not in the same way.
Closing this ticket here, as there is already a ticket open in the upstream repository : https://github.com/KhronosGroup/glTF-Blender-IO/issues/2176

Hello, Thanks for the report In 4.0, the alpha channel was created only from Red channel of the texture. In 4.1, no alpha is generated. Agree that the behavior changed. Was not right, and still is not right, not in the same way. Closing this ticket here, as there is already a ticket open in the upstream repository : https://github.com/KhronosGroup/glTF-Blender-IO/issues/2176

Julien Duroure closed this issue

2024-04-16 05:50:52 +02:00

Blender Bot added

and removed

labels 2024-04-16 05:50:53 +02:00

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