The model compressed with draco cannot be displayed in cesium without any error message

[lanvada]

I use gltf-pipeline to compress the model. however, the compressed model cannot be displayed in cesium.
this is the input parameter :
gltf-pipeline -i {input} -o {output} -d --draco.compressionLevel=7 --draco.quantizePositionBits=20
I also tested the model in gltf-viewer and it loads correctly in the gltf-viewer

I found the following four situations during testing:

1. The model fails to load in cesium once any quantizeBits parameter is set.
2. The model loads correctly if only the compressionLevel parameter is set.
3. Set the unifiedQuantization parameter while setting the quantizeBits parameter. No matter if the unifiedQuantization parameter is set to true or false, the model can be loaded in cesium but cannot be loaded in gltf-viewer
4. After the unifiedQuantization is set, the model can be loaded in cesium but cannot be displayed correctly (the model will suddenly disappear partially when the camera is close). I guessed that the bounding box of the model might be incorrect, but after I turned on the bounding box display of the tileset, I found that the bounding box of the tile looks fine, and the above display problem will not happen again.

Sandcastle example:
This is my model before compression:
stairs-raw.zip
This is my compressed model:
stairs-draco.zip

Browser:
Edge
Operating System:
Windows

[ggetz]

@lilleyse Would you be able to take a look at this, or recommend someone else to look into what may be causing this?

If this is strictly an issue with gltf-pipeline or the draco module, we sure ensure the issue is in the right place.

[lilleyse]

@ptrgags or @j9liu could you check if this is fixed in ModelExperimental?

[j9liu]

@lilleyse No, this isn't fixed in ModelExperimental. The raw model shows up, but not the draco-compressed one.

[lilleyse]

Ok, I think this is a duplicate of #7471 then

[lilleyse]

@lanvada as a workaround could you try --draco.quantizePositionBits=16? There's a bug related bit depths greater than 16.

[lilleyse]

I'm going to close since this is a duplicate of #7471.