vray volume grid cache

[Ghost3d]

Hello doing a sim in Phoenix in maya and rendering in vray / houdini, getting some lines in the render I don't see this in Maya in the preview. any ideas? happening on several sims

using houdini 18.5.351
vray 5.0050 build 11723

Phoenix for maya 2020 v4.30.00 build 20200912

[Gosho.Genchev]

Hey Ghost3d ,

Any chance for a scene file so we could try to reproduce this here ?

If not:
1. Are you exporting AUR or VDBs ?
2. Could you please try disabling the Volume Grid Shader -> Smoke tab -> Volume Light Cache (Enable) and Smoke tab -> Light Scattering (Type) -> set to Disable ?
3. Could you please try inreasing and/or decreasing the Voulume Grid Shader -> Rendering tab -> Step % and Shadow Step % parameters - e.g. try increasing them to 900/2000 to see if anything changes.
4. Could you please try disabling Voulume Grid Shader -> Rendering tab -> Optimize Big Volumetric Grids
5. Finally, could you please try enabling V-Ray Renderer ROP -> Renderer -> Objects -> Volumetrics -> Probabilistic Volumetrics

To be fair, I'm shooting in the dark with suggestions that might help isolate the issue.

Best regards!

[Ghost3d]

thank you ill give this a try . I am caching AUR files