Invalid KHR_texture_basisu usage in AnisotropyBarnLamp.gltf

[donmccurdy]

In the AnisotropyBarnLamp.gltf sample, the .ktx2 textures are embedded without the required extensions:

glTF-Sample-Assets/Models/AnisotropyBarnLamp/glTF-KTX-BasisU/AnisotropyBarnLamp.gltf

Lines 312 to 333 in cfbe2f9

	"textures": [
	{
	"sampler": 0,
	"source": 0,
	"name": "AnisotropyBarnLamp_normalbump.ktx2"
	},
	{
	"sampler": 0,
	"source": 1,
	"name": "AnisotropyBarnLamp_occlusionroughnessmetal.ktx2"
	},
	{
	"sampler": 0,
	"source": 2,
	"name": "AnisotropyBarnLamp_basecolor.ktx2"
	},
	{
	"sampler": 0,
	"source": 3,
	"name": "AnisotropyBarnLamp_anisotropy.ktx2"
	}
	],

Compare to the examples in the spec. A quick way to fix this is to read/write the model with glTF Transform, which will automatically append the missing extensions:

gltf-transform cp input.gltf output.gltf

[echadwick-artist]

That's what I get for editing raw JSON. Thanks for the issue!