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Maniphest T88966

VDB sequences are rendered blocky here and there ( issues with Volume Displacement Modifier )
Confirmed, NormalPublicBUG
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Description

System Information
Operating system: Windows 10
Graphics card: RTX 2070 CUDA

Blender Version
Broken: blender-3.0.0-alpha+master.ef5a362a5b24-windows.amd64-release.zip

Short description of error

Blender renders these blocky frames here and there during the actual render. The VDBs seem to be fine, the same botched render frames look fine in the viewport render. These anomolies are happening only during the actual render. See the attached image (middle right image) for what is happening please.

The same sequence renders without any issues in Houdini.

(Cycles)

Here is an actual movie render (with Eevee) that shows how horrible this issue is.

Exact steps for others to reproduce the error

T88966.blend1 MBDownload

steam.4.0001.vdb7 MBDownload

  1. Open .blend file
  2. Render sequence with CUDA

Issue should appear within 30 frames

Related Objects

Event Timeline

kursad k (kursadk) created this task.Jun 8 2021, 7:16 PM
kursad k (kursadk) updated the task description. (Show Details)
kursad k (kursadk) updated the task description. (Show Details)Jun 8 2021, 7:29 PM
kursad k (kursadk) renamed this task from VDB frames are rendered blocky here and there to VDB sequences are rendered blocky here and there.Jun 8 2021, 7:38 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Jun 9 2021, 2:04 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Can you create shorter VDB sequence so file will be as small as possible?

kursad k (kursadk) added a comment.EditedJun 9 2021, 5:44 PM
In T88966#1173922, @Richard Antalik (ISS) wrote:

Can you create shorter VDB sequence so file will be as small as possible?

I did not create the sequence myself. I personally think that it is important to try with the original one so we can be sure it is repeatable.

It is already 100 frames total, it is a highres VDB

kursad k (kursadk) added a comment.EditedJun 10 2021, 1:30 AM

Here is a borked Eevee render frame from another sequence that came from totally unrelated source.

What is interesting is that, these borked frames are not always the same frame across different render runs. They seem to be hjappening at random frames.

kursad k (kursadk) updated the task description. (Show Details)Jun 10 2021, 2:16 AM
kursad k (kursadk) updated the task description. (Show Details)Jun 10 2021, 2:27 AM
kursad k (kursadk) updated the task description. (Show Details)Jun 10 2021, 2:30 AM
kursad k (kursadk) added a comment.EditedJun 10 2021, 6:17 AM

I think that this has something to do with the volume displacement modifier. Disabling this modifier seems to get rid of these faulty renders. I am guessing that the displacement modifier has some issues with the ranges in the voxel domain.

kursad k (kursadk) renamed this task from VDB sequences are rendered blocky here and there to VDB sequences are rendered blocky here and there ( issues with Volume Displacement Modifier ).Jun 10 2021, 6:17 AM
Pratik Borhade (PratikPB2123) changed the task status from Needs Information from User to Needs Triage.Jun 23 2021, 11:13 AM
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Aug 31 2021, 6:38 AM
Richard Antalik (ISS) updated the task description. (Show Details)
Richard Antalik (ISS) added a project: Render & Cycles.
Brecht Van Lommel (brecht) changed the subtype of this task from "Report" to "Bug".Dec 8 2021, 9:49 PM