Rouge outline and boxes around label's characters and billboards

[rutsky]

I often (but not always) see gray border around characters and billboards in clustering demo:

Tested on Ubuntu 16.04 with Firefox 51.0a2 and Chromium 53.0.2785.143 on GeForce GTX 980 with proprietary drivers 367.44.

[rutsky]

Same issue on labels demo:

[rutsky]

This is not reproduced when I use integrated graphics from Intel on the same Linux machine.

[rutsky]

Might be related: #2130

[rutsky]

@mramato since you've seen similar issue as you noted in this comment, maybe you can give some hints what is the reasons of this bug and how can it be resolved?

[mramato]

@bagnell believes this may be related to texture coordinates being slightly off for billboards. The odd part is that it only happens on some systems, so we could have a case of undefined behavior somewhere or a rounding issue. Billboard collection (particular the shaders) would be the first place I look to try and debug this.

[elFerZur]

I have the same problem with billboards, of any type (gif, png, svg). Tested on Windows 10 with Firefox 49 and Intel graphics card.

[emackey]

@rutsky @elFerZur Can either of you re-test this with master now that #4675 is merged? Thanks.

[rutsky]

@emackey I can't reproduce with borders described in this bugreport, thanks!

Not sure is it related, but in master I don't see labels in clustering demo:

[bjbrewster]

I believe this last issue of missing labels is related to #4919

[hpinkos]

Also reported by @dominicrico in #6006

[mramato]

@bagnell is this just a clamping issue? I didn't realize this bug was still around.

[dominicrico]

Any update or workaround here?

[emackey]

@dominicrico I had believed this was fixed with #4675, and was left open by accident (or due to mentioning of missing labels, although that should have been a separate issue).

I tried a 100x200 billboard in Firefox and couldn't reproduce the black borders. Can you send us a reproduce case?

[mramato]

@emackey it looks like people are still having issues with the latest Cesium, either this was re-introduced or is cropping up in a different form.

Does anyone have a simple Sandcastle that shows this issue?

[rutsky]

@mramato

Does anyone have a simple Sandcastle that shows this issue?

I see this bug in clustering demo from the original bug report on Firefox 57.0.1 on Ubuntu 16.04 with GeForce GT 640M and Nvidia drivers 340.102 (thought it doesn't appear with all billboards):

[EarMaster]

Any news on this?

[emackey]

@EarMaster I can't reproduce this under Windows, and I don't have a Linux system to test. What system, browser, graphics card, and demo do you see it on?

[EarMaster]

I can reproduce this with Mac OS 10.13.4 on a 2017 iMac (Radeon Pro 575) and Firefox 59:

[hpinkos]

Also see example in #7703

[hpinkos]

Appears in firefox on the callback property demo #8344 (comment)