Three.js: GLTFLoader doesn't save 'extras' of a root glTF-object

[wlinna]

Description of the problem

GLTFLoader doesn't save extras that are attached to the root glTF-object to userData

https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#reference-gltf

It merely adds unknown extensions to userData, even though userData could be immediately initialized with json.extras, which is what GLTFLoader should, IMO, do.

https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/GLTFLoader.js#L187

Three.js version

• [X] Dev

[takahirox]

Good catch! Would you like to make PR?

[wlinna]

Sure. I'll do it on Monday.

[mrdoob]

16735