What is the difference in the mat.in if defining unsupported vs don't do anything explicitly?

[PsycoTodd]

Hello

I notice this difference when I work on KHR_materials_specular support with other extensions and try to mitigate the 8 sampler limits so I need to drop out certain textures in the specular case.

If I defined

# ClearCoat Features
ClearCoat = optional
ClearCoatTexture = optional
ClearCoatRoughnessTexture = unsupported
ClearCoatNormalTexture = unsupported

The unbershader cannot find materials for this. even I have one.

But if I remove the last two lines. It will find my unbershader and run. Indeed ignoring the normal texture of clearcoat.

My question then is: what is the difference if we do not define unsupported for certain texture? What is the recommended way?

thank you