USD primvars in vray material

I cannot imagine promoting it to max objects in my case (such a big crowd) but in other cases it might work.
I don’t understand this > it needs the data as per primitive attributes, not the primvars themselves can you explain it more? How it could be stored in usd?

Works on grouped objects, tested and confirmed ,so no problem.

This is based on what’s written in the openUSD docs. I’ll get somebody from the Houdini team to give more details.

Thank you a lot!