# Draco-Compressed Point Cloud Batch Table Attributes

**URL:** <https://community.cesium.com/t/draco-compressed-point-cloud-batch-table-attributes/9328>\
**Category:** CesiumJS\
**Created:** [April 14, 2020, 2:15am UTC](https://community.cesium.com/t/draco-compressed-point-cloud-batch-table-attributes/9328 "2020-04-14T02:15:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jtfell](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jtfell/32/2116_2.png) [@jtfell](https://community.cesium.com/u/jtfell)\
**Post date:** [April 14, 2020, 2:15am UTC](https://community.cesium.com/t/draco-compressed-point-cloud-batch-table-attributes/9328/1 "2020-04-14T02:15:58Z")

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Hey guys, I am trying to add a batch-table per-point attribute to my draco compressed .pnts files. I can get it to work by embedding the JSON array directly in the batch table JSON, but want the smaller file sizes that come from the draco-compressed binary format. From the spec:

`byteOffset` and `byteLength` are not defined in the Batch Table extension; all compressed data is stored in the Feature Table binary.

I’m a bit confused by this. I take this to mean that you don’t include a batch table binary in the file, you just add another attribute to the feature table. I have tried this, but it seems that Cesium doesn’t look in the feature table in this case, I get the error:

Property HAG requires a batch table binary.

I stepped through the Cesium loader code and found that its just checking for a batch table binary, not checking the compressed feature table.

I’m not sure if I am misunderstanding the spec or this is a bug in Cesium. Thanks.