gltf

When camera.roll = 0, the camera.changed event doesn't fire when changes only occur to the heading. e.g. if the user is looking down and rotates the camera. This causes issues with our compass not updating.

Sandcastle example:

Try the rotate buttons in the sandcastle below, you'll see that the camera.changed event is fired only when the roll =/= 0:
[Sandcastle](https://sandcastle.cesium.com

https://github.com/donmccurdy/glTF-Generator-Registry

In addPipelineExtras, a _pipeline object with a source is added to the extras of each buffer, so it can be used in https://github.com/CesiumGS/gltf-pipeline/blob/47e25f05dcb86d271675f9b5fa5be8dee8205b55/lib/mergeBuffers.js#L29

If a custom stage adds a buffer, it will not have a extras._pipeline object and therefore, will cause a crash in the line above.

A possible solution would

You should be able to add text to a scene. Either as a Text Geometry or SDF text, probably both.

There's already a text component in AFrame that we can use in Hubs. We would need to add a new Spoke node with the ability to preview the text.

I think we should export the following properties:

value
align
anchor
baseline
color
he