Unable to load two Draco models with the same url

[lilleyse]

See this Sandcastle.

The bug seems to be caused by two Draco models sharing the same cached resources. Maybe the cached resources are not getting set correctly after the first model is loaded?

This is also impacting i3dm tilesets where tiles point to the same external glTF.

@ggetz can you look into this?

[mramato]

I marked this as next release since it breaks draco tilesets using instanced models.

[mramato]

There's reports that i3dm draco tiles are not properly rotating models. I re-opened this for now, but if it turns out to be an unrelated bug; please close.

Forum thread: https://groups.google.com/d/msg/cesium-dev/w5DnTHZATRo/nl6l0kZyAQAJ

[mramato]

Turns out the rotation issue was #6632 and not Draco related

[cesium-concierge]

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

https://groups.google.com/d/msg/cesium-dev/w5DnTHZATRo/nl6l0kZyAQAJ

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

The issue at #6668 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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