Selected hydra renderer doesn't support prim type 'Volume' & 'OpenVDBAsset'?

I followed the video tutorial and got the above result. Volume rendering received a warning and did not work.
I remember it worked before I reinstalled the system. Can someone tell me what is wrong?

ParaView 5.9.1
ParaView-Connector 100.0.0-BETA.1
Create 2021.1.1 (Kit Version: 100.3.528-c8003e0d-release)

Windows 10 Pro, 64-bit
NVIDIA GeForce RTX 2080 Ti (driver version: 471.11)

2021-06-30 03:02:59 [680,929ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/FullScene.usd for omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,929ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/FullScene.usd
2021-06-30 03:02:59 [680,929ms] [Info] [rtx.mdltranslator.plugin] Resolved omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl to omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,931ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for df.mdl
2021-06-30 03:02:59 [680,931ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,932ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve df.mdl
2021-06-30 03:02:59 [680,932ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for state.mdl
2021-06-30 03:02:59 [680,932ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,932ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve state.mdl
2021-06-30 03:02:59 [680,932ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for math.mdl
2021-06-30 03:02:59 [680,932ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,933ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve math.mdl
2021-06-30 03:02:59 [680,933ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for base.mdl
2021-06-30 03:02:59 [680,933ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,933ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve base.mdl
2021-06-30 03:02:59 [680,934ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for tex.mdl
2021-06-30 03:02:59 [680,934ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,934ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve tex.mdl
2021-06-30 03:02:59 [680,934ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for anno.mdl
2021-06-30 03:02:59 [680,934ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,934ms] [Warning] [rtx.mdltranslator.plugin] Unable to resolve anno.mdl
2021-06-30 03:02:59 [680,935ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,935ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,935ms] [Info] [rtx.mdltranslator.plugin] Resolved nvidia/core_definitions.mdl to file:/c:/ov/pkg/create-2021.1.1/_build/kit_release/_build/mdl/nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,935ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/FullScene.usd for nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,935ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/FullScene.usd
2021-06-30 03:02:59 [680,936ms] [Info] [rtx.mdltranslator.plugin] Resolved nvidia/core_definitions.mdl to file:/c:/ov/pkg/create-2021.1.1/_build/kit_release/_build/mdl/nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,976ms] [Info] [rtx.mdltranslator.plugin] omniclient::pushBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl for nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,977ms] [Info] [rtx.mdltranslator.plugin] omniclient::popBaseUrl: omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl
2021-06-30 03:02:59 [680,977ms] [Info] [rtx.mdltranslator.plugin] Resolved nvidia/core_definitions.mdl to file:/c:/ov/pkg/create-2021.1.1/_build/kit_release/_build/mdl/nvidia/core_definitions.mdl
2021-06-30 03:02:59 [680,979ms] [Warning] [rtx.neuraylib.plugin] [MDLC:COMPILER] 1.0 MDLC comp warn : omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl(155,9): unused parameter ‘specular_level’
2021-06-30 03:02:59 [680,980ms] [Warning] [rtx.neuraylib.plugin] [MDLC:COMPILER] 1.0 MDLC comp warn : omniverse://localhost/Users/test/paraview/Session_0/materials/PBR_Translucent.mdl(155,9): unused parameter ‘specular_level’

Currently, only polygonal surface data is transferred to Omniverse ?

Actually I am very interested in OpenVDB rendering, I tried the following code but it also does not work. Is there any volume rendering example for reference ?

def import_volume(self, vdb_path):
    from pxr import UsdVol
    path = self.stage.GetDefaultPrim().GetPath().AppendPath('Volume')
    self.volume = UsdVol.Volume.Define(self.stage, path)
    self.volume.CreateFieldRelationship("field:density", path.AppendPath('ovdbfield'))
    self.volume_field = UsdVol.OpenVDBAsset.Define(self.stage, path.AppendPath('ovdbfield'))
    self.volume_field.CreateFilePathAttr(vdb_path)

Hello epw,
Thank you for the inquiry.
I will bring it to the developers for review towards a possible solution.
Thank you for your patience.

Thats correct, we currently don’t support non-uniform volumetrics.

We have internal builds with initial volumetrics support.

I can’t commit yet to when those will be available in a public build as some polishing is needed, but hopefully it wouldn’t be long.

Most likely in order to get the best perf with VDBs, you’ll need to follow a MDL template that we will provide.