Anisotropy example is using KHR_materials_anisotropy incorrectly

[fhechtAdobe]

Hi, I was super excited to find an example of a GLTF asset with anisotropy. Especially one that is using a texture to drive the anisotropy. Thank you for making that public.

But the asset is not using the KHR_materials_anisotropy extension as described here: KHR_materials_anisotropy

The asset uses this:

"KHR_materials_anisotropy": {
    "anisotropy": 0.75,
    "anisotropyDirection": [
        1,
        1,
        0
    ],
    "anisotropyDirectionTexture": {
        "index": 3
    }
},

Based on the spec there should be anisotropyStrength, anisotropyRotation (a single float value) and anisotropyTexture.

I suspect this asset was made with an earlier version of the extension spec, before it was ratified. If you have a version of this asset that you can publish with an updated extension that would be super valuable, so that people can see how this type of asset should be constructed.

Thanks so much!

• Florian

[echadwick-artist]

Ah thanks for finding this. This is indeed an older version of the asset.

The current version, with correct formatting and documentation, is here: https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/AnisotropyBarnLamp

I will remove the assets in the 3D-Formats-Guidelines repo since they are needlessly duplicated here.

[echadwick-artist]

Fixed with PR22 https://github.com/KhronosGroup/3D-Formats-Guidelines/pull/22