gltf exporter will drop specular texture! But gltf 2.0 actually support specular!! #95859

New Issue

butaixianran · 2022-02-18T04:58:56+01:00

butaixianran commented

2022-02-18 04:58:56 +01:00

Blender Version
Broken:
3.0

Short description of error
When exporting gltf file, Specular texture will be droped.

Blender's official document doesn't even mention specular in gltf section. Seems blender team doesn't know gltf 2.0 supports specular.

You can find it here:
https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_specular

Specular is supported as a standard's extension, like this:

"materials": [
{
"extensions": {
"KHR_materials_specular": {
"specularFactor": 1.0,
"specularColorFactor": [1.0, 1.0, 1.0],
}
}
}
]

Also there are other important gltf standard extensions need to be supported:

KHR_materials_specular
KHR_materials_transmission
KHR_materials_sheen
KHR_materials_ior
KHR_materials_clearcoat
KHR_materials_volume

Otherwise, we won't get a reasonable rendering result with exported gltf.

**Blender Version** Broken: 3.0 **Short description of error** When exporting gltf file, Specular texture will be droped. Blender's official document doesn't even mention specular in gltf section. Seems blender team doesn't know gltf 2.0 supports specular. You can find it here: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_specular Specular is supported as a standard's extension, like this: ```json { ``` "materials": [ { "extensions": { "KHR_materials_specular": { "specularFactor": 1.0, "specularColorFactor": [1.0, 1.0, 1.0], } } } ] ``` } ``` Also there are other important gltf standard extensions need to be supported: KHR_materials_specular KHR_materials_transmission KHR_materials_sheen KHR_materials_ior KHR_materials_clearcoat KHR_materials_volume Otherwise, we won't get a reasonable rendering result with exported gltf.

butaixianran commented

2022-02-18 04:58:56 +01:00

Added subscriber: @butaixianran

Julien Duroure self-assigned this 2022-02-18 09:58:54 +01:00

Julien Duroure commented

2022-02-18 10:06:49 +01:00

Hello,
Currenlty, not all official extensions are supported. We are aware of it, this is on our backlog.

Note: In your list, KHR_materials_clearcoat is already managed

Hello, Currenlty, not all official extensions are supported. We are aware of it, this is on our backlog. Note: In your list, KHR_materials_clearcoat is already managed

Julien Duroure commented

2022-02-18 10:07:46 +01:00

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

butaixianran commented

2022-02-18 17:08:37 +01:00

ok, good to know blender cares about this. Will keep watching on this task, thanks for your reply

Julien Duroure commented

2022-07-07 08:12:22 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Julien Duroure closed this issue

2022-07-07 08:12:22 +02:00

Julien Duroure commented

2022-07-07 08:12:22 +02:00

Fixed by 042fbefac6
Note that glTF and Blender are not using the same way to manage specular data, so there is no 100% compatibility at export or import.
Documentation update is still in WIP.

Fixed by 042fbefac686 Note that glTF and Blender are not using the same way to manage specular data, so there is no 100% compatibility at export or import. Documentation update is still in WIP.

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gltf exporter will drop specular texture! But gltf 2.0 actually support specular!! #95859