disableDepthTestDistance bug when globe is tilted

[rahwang]

Reported on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/gn56Qo60i4s

When disableDepthTestDistance is set to a small number, it works as expected until the globe is rotates, then entities regardless of distance seem to ignore the depth test.

Here's a sandcastle example:
http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Hello%20World.html&label=Showcases&gist=49ebc4d710383cfd2fec9d1fc4ed650b

[emackey]

Also, if you zoom into the Earth in the above demo, and look up at the sky, you'll see dots from behind the camera mirrored into the sky.

[emackey]

This is zoom-in only, no globe rotation. Note the "second batch" of dots show up in the earlier part of this anim, I think the depth cone gets disabled or something there. Then a "third batch" starts drifting down from the sky, they seem like they're supposed to be behind the camera or something, certainly not above.

[emackey]

The "floating down from the sky" bug is actually duplicate with #5331.

But, the "visible on the other side of the globe" aspect shown here is not mentioned there. It may be a separate but related bug.

[mramato]

I'm running into this on a regular basis now as well.

[pjcozzi]

This could be the depth plane. Have you tried with terrain and depth writes enabled?

[cesium-concierge]

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

• https://groups.google.com/forum/?hl=en#!topic/cesium-dev/gn56Qo60i4s

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

The issue at #5501 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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