Make root tile public

[lilleyse]

Makes tileset.root public as a convenience. Cesium3DTile is already part of the public API so this is safe. A lot of code outside of Cesium is calling tileset._root and it would be better to call tileset.root instead. I don't see the harm in making it public.

Also added tile.boundingVolume since we already have tile.contentBoundingVolume. They are both @private still.

@OmarShehata can you review?

[cesium-concierge]

Thanks for the pull request @lilleyse!

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• ❔ CHANGES.md was not updated.
  • If this change updates the public API in any way, please add a bullet point to CHANGES.md.

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[OmarShehata]

Looks good, Cesium Viewer still works in all browsers and in 2D/CV.

Since this does expose a public way to access root, should it be added to CHANGES.md ?

[lilleyse]

Ah yes, added an entry to CHANGES.md.

[hpinkos]

Why bother adding this if it's marked @private ?

[lilleyse]

Pretty much just following what contentBoundingVolume does. It looks nicer when other files that need this call tile.boundingVolume instead of tile._boundingVolume. It can't be public though since TileBoundingVolume is private.

[hpinkos]

Ah okay. We want to access it from other classes without adding it to the public API

[lilleyse]

Yup

[hpinkos]

Thanks @lilleyse!

[hpinkos]

Thanks for reviewing @OmarShehata!