Support for glTF 1.1

[pjcozzi]

The pull request for the draft glTF 1.1 spec is now open: KhronosGroup/glTF#784

We'd like a few engines and tools to implement it and provide feedback before we submit it for Khronos ratification. It would be awesome if three.js could be one of them.

There are several changes but they are small and almost always straightforward, see KhronosGroup/glTF#605

CC @tparisi @richtr

[takahirox]

simple sample models for glTF 1.1

https://twitter.com/pjcozzi/status/813507833828429824
https://github.com/javagl/gltfTutorialModels/blob/master/README.md

[cx20]

I tried the glTF 1.1 sample with some glTF Loader.
https://github.com/cx20/gltf-test#gltf-11-tutorial-models
https://cx20.github.io/gltf-test/

I would like each library to be all green.

[donmccurdy]

We're all green for 1.1, excluding a known animation bug. This can be closed.

Next up, 2.0!

[takahirox]

Agreed with setting our target 2.0.

But just in case, I'm not sure if we're all green for 1.1.
At least I haven't checked yet.
Just GLTFLoader can load all glTF 1.1 public sample models.
https://github.com/javagl/gltfTutorialModels/blob/master/README.md

[donmccurdy]

Yes; I think supporting all of the 1.1 sample models is probably good enough to close this issue and open another for 2.0. Certainly "all green" was an overstatement. 😅 But any future 1.1 bugs we can file separately when we discover them.

[takahirox]

I see, that sounds good to me!

[cx20]

I confirmed that it became all green.
https://github.com/cx20/gltf-test