Implement GLTF exporter improvements

[mvaligursky]

• full support for the material properties export (currently only few common material properties are exported).
• export of material properties that map into glTF extensions
• export skins
• export animations

[LeXXik]

We are missing this feature. Bumping up!

[leonidaspir]

Indeed full glTF exporting is quite useful and we need in a number of cases. 🙏

[willeastcott]

I'm not sure when we will be able to schedule more work on the glTF exporter...but I would love to improve it when time allows.

@LeXXik - what are the specific features you would like added first?

If any of our open-source contributors want to tackle any of these missing features, we'd appreciate it!

[slimbuck]

Hey @LeXXik, @leonidaspir,

Can you explain where you're using glTF export atm?

Thanks!

[LeXXik]

Hi, guys. We are not currently using it, because it is lacking the features we need. We want to export a user-customized character, together with its materials and animations, so that we can import it back later. We are importing it later into a different project that doesn't have any of those assets.