VDB: Fill interrior with Surface parameters

Forums Technical Discussion VDB: Fill interrior with Surface parameters

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JOEMI: Member; 128 posts; Joined: July 2005; Offline

Nov. 1, 2019 11:52 p.m.

1. We have complex and closed poly with (for example) point Cd presented.
2. We convert it to VDB - with SDF and fog inside channels.
3. We need have Cd attrribute propagate from surface deeper into volume. Now it is possible just for limited voxel-layers around source poly-surface.

Which way can we elaborate such network? VDB Analysis node prepared closest_point vdb-channel over source ‘density’ channel, so we have all required data presented in scene.

Thank you

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Librarian: Member; 142 posts; Joined: Aug. 2009; Offline

Nov. 2, 2019 6:22 a.m.

Can you provide reference or something (file)


JOEMI: Member; 128 posts; Joined: July 2005; Offline

Nov. 2, 2019 9:42 p.m.

here you are, if it can help

to be true, I seem it will be simpler (for me) to write just a custom propagate sop dso

Attachments:
vdb_test.hipnc (222.3 KB)

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mestela: Member; 1736 posts; Joined: May 2006; Offline

Nov. 2, 2019 11:12 p.m.

If you append a volume visualize sop, you can see by enabling ‘fill interior’ on your vdb from polygons, you've done exactly as you describe you want done. You can append a volume slice to take an even closer look.

Edited by mestela - Nov. 2, 2019 23:12:29

Attachments:
vdb_cd_interior.gif (347.7 KB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


JOEMI: Member; 128 posts; Joined: July 2005; Offline

Nov. 6, 2019 8:47 p.m.

Ah. Ok, so it is just my undrestanding of documentation.

Thank you

Attachments:
2019-11-07_04-42-46.png (222.5 KB)

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JOEMI: Member; 128 posts; Joined: July 2005; Offline

Nov. 6, 2019 8:59 p.m.

Ok, I tried such vdb and found, than renderman does not render them correctly, just used Cd channel as density, but it is more questions to PxrVolume shader, than to vdb files.

Thank you anyway

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