Hello, i am trying to visualize a simple cube using 3d tiles. I have read the documentation and i have created a bgltf using the converter provided by cesium [https://cesiumjs.org/convertmodel.html], at this point i have created, by hand, the .b3dm file by writing the header and attaching the binary gltf at the end. Batch length is set to 1 and BatchTableSize is set to 0.
The cube is already georeferenced, and its inside the bounding volume specified in the tileset.json.
The problem is that i get the following error when i try to load the page: Compile log: ERROR: 0:26: 'a_batchId' : undeclared identifier
To fix this error i suppose that i need to specify this batch id. The point is that in the documentation [https://github.com/AnalyticalGraphicsInc/3d-tiles/blob/master/TileFormats/Batched3DModel/README.md] it is written that "When a Batch Table is present, the a_batchId attribute (with the parameter semantic BATCHID) is required; otherwise, it is not."
Did i misunderstand the docs? Or is this a bug?