3D Tiles Specification?

1. A concise explanation of the problem you’re experiencing.

I’m trying to figure out how to create 3D tiles containing a mesh. I see information about the JSON header for b3dm tiles, but the data itself just referenced binary glTF. So I’m looking for a formal specification of that, and I’m coming up with nothing other than what looks to be a poster for a conference (https://github.com/KhronosGroup/glTF/blob/master/README.md). Can someone point me in the right direction?

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

4. The Cesium version you’re using, your operating system and browser.

I think this is what you want: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md