Invalid KHR_texture_basisu usage in AnisotropyBarnLamp.gltf

[Don McCurdy]

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

[Eric Chadwick]

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