Open VDB Doesn't Playback Clusters Correctly #86313

New Issue

Atomic · 2021-03-05T16:54:42+01:00

Atomic commented

2021-03-05 16:54:42 +01:00

System Information
system-info.txt

Blender Version
Broken: 2.92
Worked: NA

Short description of error
Open VDB Doesn't Playback Clusters Correctly

Exact steps for others to reproduce the error
I am attaching a Houdini generated sequence of VDB files. Each of these files can contain multiple "clusters" of density. While I am seeing some playback inside of Blender 2.92, Blender is not translating the cluster boxes to the correct location. It plays them all back at the same position and rotation, presumably fetched from the first container on the first frame. These VDB boxes do change location and rotation over time and Blender should update each box correctly.

This is the Houdini output that shows the correct playback.

This the same VDB file sequence playing inside Blender 2.92.

houdini_produced_pyro_cluster.zip

**System Information** [system-info.txt](https://archive.blender.org/developer/F9870251/system-info.txt) **Blender Version** Broken: 2.92 Worked: NA **Short description of error** Open VDB Doesn't Playback Clusters Correctly **Exact steps for others to reproduce the error** I am attaching a Houdini generated sequence of VDB files. Each of these files can contain multiple "clusters" of density. While I am seeing some playback inside of Blender 2.92, Blender is not translating the cluster boxes to the correct location. It plays them all back at the same position and rotation, presumably fetched from the first container on the first frame. These VDB boxes do change location and rotation over time and Blender should update each box correctly. This is the Houdini output that shows the correct playback. ![cluster_pyro.gif](https://archive.blender.org/developer/F9870261/cluster_pyro.gif) This the same VDB file sequence playing inside Blender 2.92. ![cluster_pyro_292.gif](https://archive.blender.org/developer/F9870267/cluster_pyro_292.gif) [houdini_produced_pyro_cluster.zip](https://archive.blender.org/developer/F9870253/houdini_produced_pyro_cluster.zip)

Atomic commented

2021-03-05 16:54:42 +01:00

Added subscriber: @AtomP

JT Nelson commented

2021-03-06 07:54:42 +01:00

Added subscriber: @jta

Germano Cavalcante commented

2021-03-09 14:57:33 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-03-09 14:57:33 +01:00

I can reproduce the result in Blender, but it would be important to check the file to confirm that the problem is not with the Houdini exporter but with Blender.
Did you reimport the same sequence *.vdb into Houdini to see the result?

I can reproduce the result in Blender, but it would be important to check the file to confirm that the problem is not with the Houdini exporter but with Blender. Did you reimport the same sequence *.vdb into Houdini to see the result?

Atomic commented

2021-03-12 16:43:51 +01:00

As mentioned in the first post, Houdini is playing it back correctly. The attached GIF is the playback of the sequence through the FileCache node.

Germano Cavalcante commented

2021-03-12 16:57:51 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2021-03-12 16:57:51 +01:00

Added subscribers: @kevindietrich, @brecht

Germano Cavalcante commented

2021-03-12 16:57:51 +01:00

I'm not sure which module works in this area (#eevee_viewport?).
Maybe @kevindietrich or @brecht know more about this.

I'm not sure which module works in this area (#eevee_viewport?). Maybe @kevindietrich or @brecht know more about this.

Brecht Van Lommel commented

2021-03-15 19:11:57 +01:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2021-03-15 19:11:57 +01:00

Brecht Van Lommel commented

2021-03-15 19:11:57 +01:00

This is a known limitation currently. It's in the ToDo list in #73201 (New volume object type), I've add a bit more detail there now.

Note OpenVDB itself is printing these warnings to the console:

WARNING: cluster_missile_0_0017.vdb has more than one grid named "density"

I'm not sure that such clusters are actually a standard OpenVDB feature. It seems like a non-standard Houdini extension, but would be good to support anyway.

This is a known limitation currently. It's in the ToDo list in #73201 (New volume object type), I've add a bit more detail there now. Note OpenVDB itself is printing these warnings to the console: ``` WARNING: cluster_missile_0_0017.vdb has more than one grid named "density" ``` I'm not sure that such clusters are actually a standard OpenVDB feature. It seems like a non-standard Houdini extension, but would be good to support anyway.

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Open VDB Doesn't Playback Clusters Correctly #86313