Datasmith not working properly

[martinwalbo]

Hello!
Up until now, datasmith from rhino to twin motion has worked seamlessly.
However, now i only get the following message (project name is Wood.3dm)

Command: DatasmithDirectLinkSync
Exporting to Wood Datasmith scene
Press Esc key to cancel…
An unexpected error has occurred:
System.Exception: Object reference not set to an instance of an object. —> System.NullReferenceException: Object reference not set to an instance of an object.
at DatasmithRhino.Utils.DatasmithRhinoUtilities.SerializeTexture(BinaryWriter Writer, Texture RhinoTexture)
at DatasmithRhino.Utils.DatasmithRhinoUtilities.SerializeMaterial(Material RhinoMaterial)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.AddMaterialIndexMapping(Int32 MaterialIndex)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.AddObjectMaterialReference(RhinoObject InObject, Int32 MaterialIndex)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.RegisterActorsToContext(IEnumerable1 ActorInfos) at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.RecursivelyParseLayerHierarchy(Layer CurrentLayer, DatasmithActorInfo ParentNode) at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseRhinoHierarchy() at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseDocument(Boolean bForceParse) --- End of inner exception stack trace --- at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseDocument(Boolean bForceParse) at DatasmithRhino.DatasmithRhinoSceneExporter.ExportScene(FDatasmithFacadeScene DatasmithScene, DatasmithRhinoExportContext ExportContext, Func2 OnSceneExportCompleted)
94 curves, 18 surfaces, 552 polysurfaces added to selection.
Command: DatasmithDirectLinkConnections
Command: DatasmithDirectLinkSync
Exporting to Wood Datasmith scene
Press Esc key to cancel…
An unexpected error has occurred:
System.Exception: Object reference not set to an instance of an object. —> System.NullReferenceException: Object reference not set to an instance of an object.
at DatasmithRhino.Utils.DatasmithRhinoUtilities.SerializeTexture(BinaryWriter Writer, Texture RhinoTexture)
at DatasmithRhino.Utils.DatasmithRhinoUtilities.SerializeMaterial(Material RhinoMaterial)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.AddMaterialIndexMapping(Int32 MaterialIndex)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.AddObjectMaterialReference(RhinoObject InObject, Int32 MaterialIndex)
at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.RegisterActorsToContext(IEnumerable1 ActorInfos) at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.RecursivelyParseLayerHierarchy(Layer CurrentLayer, DatasmithActorInfo ParentNode) at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseRhinoHierarchy() at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseDocument(Boolean bForceParse) --- End of inner exception stack trace --- at DatasmithRhino.ExportContext.DatasmithRhinoExportContext.ParseDocument(Boolean bForceParse) at DatasmithRhino.DatasmithRhinoSceneExporter.ExportScene(FDatasmithFacadeScene DatasmithScene, DatasmithRhinoExportContext ExportContext, Func2 OnSceneExportCompleted)

[wim (Wim Dekeyser)]

Hei Martin -

@martinwalbo

Up until now, datasmith from rhino to twin motion has worked seamlessly.
However, now i only get the following message (project name is Wood.3dm)

You might want to look for help from the developer of that plug-in - https://twinmotionhelp.epicgames.com/s/?language=en_US
-wim

[3dsynergy]

Hi @wim
In the Rhino Version 7 SR31 (7.31.23166.15001, 2023-06-15) the Twinmotion link is working but Rhino just prompted me to install an update. Can you please confirm if the latest Rhino update broke the Twinmotion link or not. I don’t want to install the latest Rhino update if it broke the Twinmotion link.
Thanks,
RM

[wim (Wim Dekeyser)]

Hi Roland -

@3dsynergy

Can you please confirm if the latest Rhino update broke the Twinmotion link or not.

I’m not running that plug-in, so, no, that’s not something that I can confirm. There shouldn’t be any SDK breaking changes between service releases and we encourage 3^rd party developers to test their plug-ins on at least the last service release candidate.
That said, 7.32 did break the SDK and a hotfix was release when this was discovered.
-wim

[3dsynergy]

Hi @wim

Thanks for the reply so the latest rhino 7.32 sr has the hot fix in it when I install it?

Just making sure as I can’t afford to break my Rhino link with Twinmotion as I’m doing a lot of work in that program.

Thanks for your quick answer and help,
RM

[wim (Wim Dekeyser)]

Hi Roland -

@3dsynergy

so the latest rhino 7.32 sr has the hot fix in it when I install it?

7.32.23221.10241 is the SR 32 Hotfix.
This fixes an issue that prevented VisualARQ from running.

Rhino 7 Service Release Available

Rhino 7 Service Release 32 (Hot Fix 1) for Windows and Mac (7.32.23221) is now available Rhino will automatically update, unless updates are disabled. Download the latest service release now… Bugs Fixed: C++ SDK Broken in Rhino 7.32 (RH-76240).

Apart from that, if you have Rhino download and install updates automatically, you will have the previous installer still on disk in your C:\ProgramData\McNeel\McNeelUpdate\DownloadCache folder. Generally, if you rely on being able to revert to a previous version, it might be a good idea to move the exe file out of that folder so that you have something to fall back to.
-wim

[3dsynergy]

Hi @wim
That’s good advice for reverting, I forgot where the downloads was located.
Much obliged for your help and valuable information.
RM

[3dsynergy]

Hi @wim @martinwalbo
I just tested with the 7.32 Rhino service release and the Rhino to Twimmotion link is working for me.
Just wanted to give the heads up.
RM