Extension KHR_materials_ior

[atteneder]

Add support for material extension KHR_materials_ior

This extensions allows users to set the index of refraction to a certain value.

[longda]

Greetings @atteneder !

Excited to see this one moving to planned.

Does this issues board apply to the Unity GLTFast repo + development or is this completely separate?

[atteneder]

@longda thanks for letting me know. Don't read too much into it though. It merely means I intend to implement it, but currently there's no timeline (no milestone attached).

It largely applies to Unity glTFast as well, but it's by no means an official roadmap or commitment. I use it as rough priorization tool atm.

hope that clarifies things.