Animated model optimized with gltfpack crashes / won't render

[nikiosna]

What happened?

This animated model works fine in cesium 1.120 windturbin.glb.zip

But after investigating the optimization of a model import pipeline I notice that it won't work anymore after applying the gltfpack meshoptimizer. In my setup It just is missing the rotating blades but in the sandcastle I once saw an error too. But this don't seem to happen every time.

Optimized model using gltfpack -noq -i windturbin.glb -o windturbin_optimized.glb windturbin_optimized.glb.zip

I believe its a bug in cesium because the optimized model still works fine in threejs and gltf validator shows no errors.

One thing to note is that if I import the optimized model to blender and export it again the result works again in cesium.

You can't open the sandcastle out of the box unfortunally because I used a localhost url to provide the glb files.

Reproduction steps

1. Copy the cesium sandcastle
2. Adjust the localhost urls from the windturbin and windturbin_optimized
3. Open the sandcastle with the optimized windturbin model ...

Sandcastle example

https://sandcastle.cesium.com/#c=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

Environment

Browser: Firefox CesiumJS Version: at least 1.118.2 up to 1.120 (latest) Operating System: MacOS

[ggetz]

Thanks for the report @nikiosna.

but in the sandcastle I once saw an error too

Would you be able to copy the error here?

[nikiosna]

This is the error, but it isn't shown every time and is maybe just related to the viewer.trackedEntity.

An error occurred while rendering.  Rendering has stopped.
DeveloperError: cartesian has a NaN component
DeveloperError@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:9817:13
Ellipsoid.prototype.geodeticSurfaceNormal@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:18318:13
Ellipsoid.prototype.cartesianToCartographic@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:18369:20
updateMembers@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:192362:69
Camera.prototype._setTransform@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:192729:18
updateTransform@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:159502:14
EntityView.prototype.update@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:159591:20
Viewer.prototype._onTick@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:255300:20
Event.prototype.raiseEvent@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:20103:22
Clock.prototype.tick@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:137631:17
CesiumWidget.prototype.render@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:242328:39
render2@https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:241749:20

[nikiosna]

Ok sorry I now improved the sandcastle the error is indeed more or less unrelated to this issue. Here is a improved sandcastle which skips the trackedEntity for the optimized model and some screenshots.

https://sandcastle.cesium.com/#c=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

[ggetz]

Thanks for the update @nikiosna! This appears to be due to lack of support for sparse accessors: https://github.com/CesiumGS/cesium/issues/10284.

I'm going to close your issue to keep the discussion in one place. If you have any further input on this, please post it there instead.