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aiVolume (Step Size?) render artefact with aiStandard Volume in Maya

5 REPLIES 5
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Message 1 of 6
StrongBerry
787 Views, 5 Replies

aiVolume (Step Size?) render artefact with aiStandard Volume in Maya

I use ai Volume to render a smoke of Houdini with VDB, but it appears artefact

I change step size of AiVolume, and the artefact change, so I assume that's the problem, but even I use 0.001 step size, I can still see the artefact, how can I fix this?...

Thanks in advance

StepSize 0.1

3846-artefact-stepsize01.jpg

StepSize 100

3847-artefact-stepsize100.jpg

Update:

In the scene there are two AiVolume, but we can't see the other AiVolume through camera.

I really don't think the quality is the problem, it looks like this when I render without the other AiVolume, (the black part inside the smoke is the shadow of environment)

With Environment

3856-withenviro.jpg

Without Environment

3857-withoutenviro.jpg

So maybe there is some parameters I have to set to avoid the artefect influenced by the shadow of the other AiVolume?

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5 REPLIES 5
Message 2 of 6
gshankar165
in reply to: StrongBerry

Can u try increasing the volume resolution(quality) and them export from houdini? That might help.

Message 3 of 6
lee_griggs
in reply to: StrongBerry

Are you using Volume Displacement? Do you have any other shaders connected to the Standard Volume?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 4 of 6
StrongBerry
in reply to: gshankar165

The reason is shadow of another VDB's Volume, after I deleted it, artefact disappears, even with lower quality of VDB...

Message 5 of 6
StrongBerry
in reply to: lee_griggs

No, I just use Standard Volume, displacement is 0,0,0; no Volume Dispacement involved

The reason is shadow of another VDB's Volume, maybe I miss some parameter to set in Lighting or Render Setting?

Message 6 of 6
lee_griggs
in reply to: StrongBerry

I have this issue from time to time (especially when using displacement). Maybe try Girijashankars advice.

Lee Griggs
Arnold rendering specialist
AUTODESK

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