Merging VDBs into a new VDB

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So… I may be missing something obvious here, but…

I'm having trouble getting multiple VDBs to merge together and form a new, single VDB. The VDB Combine, Volume Merge etc. nodes always merge the VDBs on top of each other. However, in my case, the VDBs are arranged in a grid (they come from multiple point clouds that are in the same grid and together make for a rather large dataset, which I try to avoid handling in a single go).

So, basically I have two VDBs, one at position 0,0,0 and the other at bbox(thefirst's X),0,0. Meaning next to each other. And now I'd love to get a new VDB that fuses them together.

Any ideas? Maybe a Volume Wrangle and copy everything into a large blank VDB?

Michael
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Hi Michael
Download the example from openvdb.org
There is a good example in there

http://www.openvdb.org/download/houdini_examples.hip.zip [openvdb.org]

The idea is to merge all vdb:s first then combine it with an empty vdb
Good Luck
Jens Martensson
FX Supervisor @ Weta Digital
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Excellent, thanks, I'll give that a go tomorrow!
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Some examples are here too:

http://forums.odforce.net/topic/21357-combine-vdb-in-forloop/ [forums.odforce.net]
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Thanks!

Though in the end I went and just used combined all the points and made a VDB from that. 125mio particles and Houdini barely broke a sweat
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