How does Cesium parse the featureId or batchId in 3D Tiles to make it an attribute

CesiumJS
1

In addition to attributes such as POSITION and NORMAL, it also includes the _BATCHID. Where is the process of parsing BatchID and how is it passed as an attribute to the shader.

2

Hi @SAYEOR,

Could you provide some additional details about what you’re looking to do? That will help us recommend where you should be looking.

Thanks!
Gabby