Greetings Community.

We can create custom attributes on Point Wrangle by:


I would like to do the same with a Volume Wrangle, but it doesn't work the same way as Point Wrangle:

"Unlike how the Point Wrangle and Attribute Wrangle nodes work, writing to an unknown @‹name› variable will not create a volume."
https://www.sidefx.com/docs/houdini/nodes/sop/volumewrangle.html [www.sidefx.com]

The document page never explains how WOULD it work.. Can anyone please advise?

I'm hoping to use VDB to compute some cost function (a scalar value) without overwriting the default density/surface attribute.

Much appreciated!

you can rename your density field to something else in a separate branch using the name sop, merge it back with your density, then edit the result in the wrangle and write to this new field.

Tanto
you can rename your density field to something else in a separate branch using the name sop, merge it back with your density, then edit the result in the wrangle and write to this new field.

Thank you, Tanto. Much appreciated for the info!

Also, I came across this article with very useful/helpful tutorials (with Houdini example files) on Volume/VDB in general:
https://www.tokeru.com/cgwiki/HoudiniVolumes.html [www.tokeru.com]

Cheers.