OptionalbaseBase color texture descriptor to use if any. Format should be rgba8unorm-srgb.
OptionalemissiveEmissive texture descriptor to use if any. Format should be rgba8unorm-srgb.
OptionalocclusionOcclusion texture descriptor to use if any. Format must be at least r8unorm.
OptionalnormalNormal texture descriptor to use if any. Format should be rgba8unorm.
ShaderTextureDescriptor used for a LitMesh with
Lambertshading.