KhronosGroup / KhronosGroup/glTF-Sample-Assets
Grayscale and baseColorTexture and emissiveTexture
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Description
TextureEncodingTest has two textures (SlotLabels.png, TestLabels.png) which are PNG files containing grayscale + alpha.
Looking at the specification, both [pbrMetallicRoughness.baseColorTexture](https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#pbrmetallicroughnessbasecolortexture) and [material.emissiveTexture](https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materialemissivetexture) are RGB plus optional alpha.
Is it expected that implementations expand grayscale to match the required components?
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