Export material extension

[m0ppers]

#180 seems related but rather general and I don't see how the raw serde stuff which is mentioned in the ticket might help?

My problem is I want export a material using a not yet accepted material extension (https://github.com/UnboundTechnologies/glTF/tree/master/extensions/2.0/Vendor/EXT_pbr_attributes).

The extension property of material only seems to accept the pbrGlossiness stuff. I am a rust novice so I might have missed something obvious. Allowing pure json in there would actually already help.

The only bummer I found so far. Love to work with gltf-rs so far \o/

[alteous]

Hello,

Support for custom extensions is limited at the moment. The reason is due to indecision whether extensions should be imported/exported the same as Extras; that is, raw JSON (RawValue) as you mention. We haven't had much interest in extensions, hence the current lack of support. In future, we could provide a choice of either 'integrated' extensions (as we have now with the KHR_materials_pbrSpecularGlossiness feature) or raw JSON extensions. I'm not sure if having both is possible.

I'm pleased to hear the crate is working for you!

[alteous]

Closed in favour of #231.