Enable KHR settings (transmission) in runtime

[bghgary]

@Evgeni_Popov

Maybe you could “inject” this extension yourself during load, if we have a way to do it… Let’s ask @bghgary if it’s possible

Yes, this is possible. If you use the onParsedObservable of the glTF loader, you can modify the glTF JSON before it loads. This is quite hacky though.