Black glTF models

[pjcozzi]

I believe there have been reports of glTF models showing up black in Cesium on the forum (if you know of any please comment here). There is a reported issue in Three.js on some hardware, mrdoob/three.js#8381. If this is the generated shaders, we will either fix the shaders or workaround them in JavaScript.

This could affect all of our lighting code, not just glTF models.

[hpinkos]

https://groups.google.com/d/msg/cesium-dev/nlWiGXaaDz4/m1sVlxajCAAJ
https://groups.google.com/d/msg/cesium-dev/FFKF3N77FmQ/Edpa3y3IBAAJ

[hpinkos]

Also seen here: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/q7U3dSjFDRk

sail_boat.gltf.txt

[lilleyse]

I'll take a look at that one since it went through the obj converter.

[psiphi75]

I have updated the the Google Groups forum topic with the original OBJ file as well, as well as other details.

[lilleyse]

Thanks I'll check it out!

[psiphi75]

Apparently the OBJ file was corrupt, in my case. Sean Lilley had a look and said the following:

It looks like the website exports a somewhat broken obj file. The faces reference normals that don't seem to exist and the obj doesn't load correctly in any programs I've tried. I was able to clean up the obj a bit and export it correctly, but I would bring this issue up with tinkercad.

[hpinkos]

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

[ggetz]

Brought up on the forum: https://groups.google.com/forum/#!topic/cesium-dev/k4zWR2R7shY

[tkazik]

hi folks

i guess this question/issue also fits in here (better than in the exporter):

KhronosGroup/glTF-Blender-Exporter#143

basically, the models are much darker in cesium than the other viewers. thank you for your help!

[tkazik]

Just discovered this closed one:

#5787

To me, the milk truck still looks pretty dark also after the fix/update.
What do you think? What options are there in cesium to make the models appear brighter?
Thank you!

[emackey]

The dark/black models should be all gone from the May release of Cesium 1.45.

[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/nlWiGXaaDz4/m1sVlxajCAAJ
https://groups.google.com/d/msg/cesium-dev/FFKF3N77FmQ/Edpa3y3IBAAJ
https://groups.google.com/forum/?hl=en#!topic/cesium-dev/q7U3dSjFDRk
https://groups.google.com/forum/?hl=en#!topic/cesium-dev/WNkjQNihsfY
https://groups.google.com/forum/#!topic/cesium-dev/k4zWR2R7shY

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

The issue at #3737 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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