AOV Availability

When you query a renderer for it’s available AOV’s, if there is one that you would like that is not listed, does that mean that’s it and you can never get it?

eg, HdStorm does not have a normal or world position pass, but i’d quite like to get one. How would you go about getting it, if at all? Is the functionality just not there in that renderer to get that information?

Regards,
Simon.