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is there some equivalent for @elemnum/@ptnum/@primnum/@vtxnum in volume wrangles?
So for example I can read some primitive attributes or sample volumes from other inputs corresponding to the one that is being processed?

well, you can sample it with volumesample [], but only using a position for that.
for volumes, there are some options.
1 [], 2 []

Aslo volumewrangle help says []
ix, iy, iz
The integer index of the current voxel. With VDBs, this can be negative.
I'm not sure if you can do that currently, but seems very useful, so definitely submit RFE
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