How to change Bounding volume from box to region?

[hechouzi]

I have a problem when changing Bounding volume from box to region.I use Cesium.Cartographic.fromCartesian() to convert cartesian coordinates to radians,but the result is wrong.The center of box volume is [ -4.65661287307739e-10, 0.000116813229396939, -0.000936155673116446],and the result is [height: -6357078.545744079,latitude: -1.4474808437139701,longitude: 1.5708003131694683],
the transformed Bounding volumeis shifted a lot!

[javagl]

Sorry for the delay here.

This repository is hosting the 3D Tiles specification. If you have general questions about CesiumJS, then the forum at https://community.cesium.com/c/cesiumjs/5 may be a better place to ask.

Iff you ask the question there, then it is usually appreciated to include a few lines of example code of what you have tried, preferably as a Sandcastle that can directly be opened. (In this case, a Sandcastle that creates the bounding box, and shows how you try to compute a bounding region from that).

(You can also add these details here, but usually, issues here should be about the 3D Tiles specification, and not about CesiumJS)