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hayden martin

How to Up-res a VDB Containing Velocity Data?

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Hey all

I have some low-ish resolution VDB dust clouds created in C4D with the TurbulenceFD plugin. These contain velocity channels.

So far, I'm just not satisfied with the overall detail. What I've done to try and increase detail is convert the VDBs to Volumes, Volume Resample them, then use Volume Velocity to add some curl noise.

It's looks OK, but by no means what you would call a true Up-res, that uses existing velocity channels to increase detail in turbulent areas...

So that's the question really. How do I take a pre-calculated VDB (not dynamic at all) and give it a high-res makeover?

Any pointers would be appreciated. Please be aware that the overall motion has been signed off, so all that I should be changing at this point is detail. I would just do the Up-res in TurbulenceFD, but it's buggy as hell and wont work. Every day I get closer to ditching C4D entirely.

Thanks!

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Use Vdb advect node ?

isolate the vel channel and connect it to the second input of vdb advect node.  you can resample the incoming volume using vdb resample and then connect it to the first input of vdb advect node. 

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