Jump to content
catchyid

vdb combine produces "errors" in combined volumes

Recommended Posts

Hello,

I have 4 cloud vdbs that I combine at the end using vdb combine. The problem is if I render each cloud individually they look right in rendering, however if I combine the four in one big vdb the render looks "almost" perfect, meaning some areas could flicker for couple frames then go back to normal? has anyone experienced this problem before? the only solution now is to export each cloud independently instead....

thx

Share this post


Link to post
Share on other sites

I experienced a similar issue a couple years ago when the VDBs were being recalculated every frame.  I can't recall exactly, but I believe we added a VDB Renormalize SDF to fix the majority of the problem frames so that might be worth a try.

  • Like 1

Share this post


Link to post
Share on other sites

thx, will check that node to see how it works...i am using vdb for fog, so i am not sure a SDF function would work, anyways, will double check, thx :)

Share this post


Link to post
Share on other sites

What version of Houdini are you using? It might be related to this issue in the change log:

 

Houdini 18.5.460 OpenVDB support has been reduced to 7.1.0 pending investigation of a CSG Interesction failure detected in 7.2.1 version.

 

7.2.1 was introduced in Houdini 18.5.452   

Share this post


Link to post
Share on other sites

hi Karl, I am using 17.5...it's an older houdini version, so I assume it should be OpenVDB 7.1.0, however, I am pretty confident now that vdb merge in this houdini version as well is buggy: when exporting each cloud alone I get good render, when I merge all clouds I get flickering and bands...maybe it was not noticed/reported in houdini 17.5, but i think it's still there...

thank you Karl :)

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×