3D Tiles 1.0 Updates

[lilleyse]

These are the updates required to load tilesets defined by the 3D Tiles 1.0 spec.
@ggetz if you think of others feel free to add to this list.

Now:

• Add support for b3dm RTC_CENTER Add RTC_CENTER support for b3dm #6488. The glTF 1.0 extension CESIUM_RTC will still be supported but this is the preferred method.
• content.url changed to content.uri. Support loading both, but if content.url is used log a deprecation warning. Once the PR is merged, add a note to Remove 3D Tiles deprecation warnings #5363.
• Load batch table hierarchy extension. Still support loading the non-extension version, but log a deprecation warning. Once the PR is merged, add a note to Remove 3D Tiles deprecation warnings #5363.
• Update all tilesets in Specs/Data/Cesium3DTiles with the upgraded tilesets in 3d-tiles-tools: 3D Tiles - Update sample tilesets #5504 and glTF 2.0 in samples generator 3d-tiles-validator#139

Later:

• Add extras to API Add extensions and extras to 3D Tiles #6490. No need to add extensions to API yet.
• Update any 3D Tiles links in the documentation after the 1.0 branch is merged.
• Standardize the deprecation messages for anything in Remove 3D Tiles deprecation warnings #5363.

[lilleyse]

In the near future we should also go through all the items in #5363 and remove the deprecation checks.

[ggetz]

@lilleyse I double checked and this list seemed comprehensive. The only thing else I can think of is if the padding clarifications require any implementation changes, which I don't believe they do.

[lilleyse]

Loading a 1.0 tileset came up on the forum: https://groups.google.com/forum/#!topic/cesium-dev/8zJhev5Vh5w.

I reordered the list so the most important items for compatibility are first.

[hpinkos]

@lilleyse all of our tilesets used in Sandcastle generate deprecation warnings. Is fixing that part of this roadmap issue?

[ggetz]

@hpinkos #5504

3d-tiles-tools has been updated to generate 1.0 tilesets, so we should be good to at least get rid of the sandcastle tilesets that throw deprecation warnings before the next release.

[mramato]

Just a reminder that the release is this Wednesday. We should really try and get all showstopper issues addressed by the end of today.

[tfili]

Is this going to make it in for tomorrow?

[ggetz]

Yes, finishing these up now, see #6862 and #6861 (comment)

I think that covers all sandcastle tilesets.

[tfili]

What about the extra tasks under later? Do you want to write a new issue or just remove the Next Release tag on this one?

[mramato]

We really should be writing small issues, no roadmaps. Roadmaps make everything super opaque and hard to fine.

[lilleyse]

Ok this is good to close now.

• extras API - Add extensions and extras to 3D Tiles #6490 is still open
• Update 3D Tiles links - part of Merge 1.0 branch into master 3d-tiles#327
• Deprecation messages Remove 3D Tiles deprecation warnings #5363 - closed

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/#!topic/cesium-dev/8zJhev5Vh5w

If this issue affects any of these threads, please post a comment like the following:

The issue at #6697 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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