Tomas Slancik

kta3d
...however, i have not found any way in Houdini to make a vdb that has anything other than a single 'density' attribute in a single channel. I would ideally like to channel-pack a VDB so multiple cloud/fog densities are stored into separate named channels/attributes (even if that doubles the file size)..

You can have multiple named float or vector vdb primitives in the geometry and when you save that geo into .vdb they all will be within the same single .vdb file

it does scale the timestep, some nodes do have Scale By Timestep checkbox

so on your Blur COP check Scale By Timestep (note that even on Timescale 1 this changes the blur strength as default timestep is 1/fps, so adjust accordingly)
then if you play with Timescale you should see the difference

vanilla Python likely cant understand opdef:

However you can use hou. readFile() [www.sidefx.com] to read your file from opdef : section into a string and go from there