3D Tiles crashes with Cesium 1.97

CesiumJS
1

Hi all,
I have uploaded a 3D Tileset on ION.
This is a 3D Tileset made of CMPT/I3DM tiles representing trees (with 3 LOD).
This Tileset displays fine with Cesium 1.84 but crashes with 1.97.

I get this error:
TypeError: Cannot read properties of undefined (reading ‘configurePipeline’)
at wl.buildDrawCommands (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:4411:5330)
at P8e (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:4411:36339)
at Co.update (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:4411:34420)
at ps.update (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:4411:49130)
at wm.update (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:3165:12811)
at Uo.process (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:5117:70516)
at A7e (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:5117:103378)
at Os.prePassesUpdate (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:5117:101612)
at Bs.prePassesUpdate (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:5288:95687)
at Lft (https://cesium.com/downloads/cesiumjs/releases/1.97/Build/Cesium/Cesium.js:8450:38365)

Note that it displays fine in the preview window of my ion account, but when I click on ‘Open complete code example’ which displays it in the SandCastle, It crashes.

In the same way, in my own cesium-based application, I get no error with Cesium1.84 but I started to get the crash when I tried to update to 1.97.

Anyone here knows If there is a workaround or have an explanation about this crash ?

Thanks in advance,
Frédéric.

2

Hi @ftrastour,

Cesium 1.97 introduced a new architecture for loading glTF models. This code is also used for Cesium3DTileset.

I haven’t seen this error before when loading cmpt or i3dm tilesets. Could you provide the asset ID so we can look into this further?

Thanks,
Peter

3

Hi Peter,

The asset ID is :

image001.png

image002.png

image003.png

image004.png

4

Hi @ftrastour,

Your last message appears to be cut off. Could you send the asset ID again? Thanks!

5

Hi Peter,

the asset ID on my account (user:ftrastour) is 1320054 (trees_denses_lods_1000_50).

Let me know if you prefer to examine a smaller Tileset.

Thanks,

Fred.

image001.png

image002.png

image003.png

image004.png

6

Hi @ftrastour,

Thank you for the asset ID, I was able to try out your tileset and reproduce the problem. Your tileset uses a glTF with the MSFT_lod extension. Since CesiumJS does not support this extension, the 2 LOD nodes are treated as unused nodes. However, there was a bug in the new Model code where unused nodes were undefined, and that leads to the crash. Fortunately, it just was a matter of filtering out the undefined nodes in the loop.

I opened Filter unused runtime nodes by ptrgags · Pull Request #10813 · CesiumGS/cesium · GitHub to fix this bug. Here’s a screenshot of it running with your data:

image
image950×545 105 KB

7

Hi Peter,

thanks a lot for having looked to this issue and fixed it.

On my side I will check how to remove these unused nodes which probably make our 3D models bigger than really needed.

Regards,
Fred.