Cesium: OIT not working correctly in Firefox

[lilleyse]

Blending vs. OIT

I have only noticed this on Firefox so far, but will check Chrome on a different computer later.

[pjcozzi]

Is this new in Firefox? It may be a bug in Firefox or a change in the Firefox WebGL implementation that exposed a bug in OIT.

[lilleyse]

Yeah this is new, at most about a month.

[hpinkos]

Also reported here: #4718

[jroetman]

A temporary workaround in my case was to update the about:config property
webgl.disable-extensions = true

see pjcozzi's comment below, it's a better solution.

Last comment... I still needed to disable extensions. Although orderIndependentTranslucency corrected transparency issues, I was losing outlines on some polygons, and was having some performance issues with picking.

[jmgomezpoveda]

Setting webgl.disable-extensions = true in my browser also fixed the issue. Though it is not really a workaround since we cannot ask users to change it in their browsers.

[pjcozzi]

As a workaround, try setting orderIndependentTranslucency : false when constructing the Cesium Viewer widget.

[jmgomezpoveda]

@pjcozzi that workaround works great on my system.

[hpinkos]

also reported here: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Kd3gJciiCkQ

[mramato]

We should probably look into this sooner, rather than later.

[mramato]

I noticed Firefox is spitting out tons of the below errors (and I believe this is a new development). Maybe there's a bug in some new code they added.

Error: WebGL: texImage2D: Incurred CPU row conversion, which is slow.  Texture.js:147:17
Error: WebGL: texSubImage2D: Incurred CPU row conversion, which is slow.

[mramato]

Last update:

1. The above errors occur even when OIT is off
2. The rendering problem still happens even with ANGLE off
3. Possibly related to #3068

[pjcozzi]

@jroetman @jmgomezpoveda this should be fixed now via #4762. It will be in Cesium 1.29 on January 2.

[jmgomezpoveda]

Yeah this works fine now in Firefox 50. Thanks!