Clipping planes not clipping reloaded tiles

[lilleyse]

When a tile is unloaded and then reloaded it does not get clipped correctly. My guess that this has to do with the clipping state not being reset. In Cesium3DTile.unloadContent I tried tile._clippingPlanesState = 0 which seemed to help but does not fix all the problems.

@likangning93 would you be able to look into this closer?

Sandcastle demo

Posted on the forum: https://groups.google.com/forum/#!topic/cesium-dev/mJ8NDsFrIhY

[likangning93]

Wonder if this is related to #6440

[EDIT] I don't think so

[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/mJ8NDsFrIhY

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

The issue at #6484 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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