PNTSLoader Compatibility issues

[haojay5]

I have a set of PNTS format data， When I loaded it, I reported an error，cesium load it is normal，the tile metadata has no POINTS_LENGTH attribute is under the header，This set of data is converted through cesium lab

[gkjohnson]

the tile metadata has no POINTS_LENGTH attribute is under the header

Your screenshot shows that POINTS_LENGTH is present in the file. However it looks like POSITION_QUANTIZED is used which you can see from the code is not currently supported.

Would you like to make a PR to add support for quantized positions? You can see documentation here: https://github.com/CesiumGS/3d-tiles/blob/main/specification/TileFormats/PointCloud/README.md#quantized-positions