Worksession.ModelPathFromSerialNumber() takes ages to run

Rhino Developer
, ,
1

Hi,

I have a bunch of 3d models that are referenced in a worksession. My goal is to know the reference file path for each referenced object.
All the models and worksession are stored on a remote storage.

Here is my code:

			var rc = RhinoGet.GetMultipleObjects("Select objects", false, ObjectType.AnyObject, out ObjRef[] objRefs);
			if (rc != Result.Success)
				return rc;

			var serialNumbers = new List<uint>();

			foreach (var objRef in objRefs)
			{
				var obj = objRef.Object();

				if (obj == null) continue;				
				if (obj.IsReference == false) continue;

				serialNumbers.Add(obj.ReferenceModelSerialNumber);
			}

			var serialNumbersDistinct = serialNumbers.Distinct().ToList();

			foreach (var number in serialNumbersDistinct)
			{
				RhinoApp.WriteLine(number.ToString());
				var path = doc.Worksession.ModelPathFromSerialNumber(number);
				RhinoApp.WriteLine(path.ToString());
			}

			return Result.Success;

The call to the doc.Worksession.ModelPathFromSerialNumber is taking almost 2 minutes per serial number and I don’t understand why: the path of each referenced file is stored in the worksession so it shouldn’t take that long to translate the serial number into a model path.
Any advice on this?

System Info:

Rhino 8 SR17 2025-2-25 (Rhino 8, 8.17.25056.13001, Git hash:master @ 8d674f13b6b22b7c0498dd9ff031d36e49dcd349)
License type: Commercial, build 2025-02-25
License details: LAN Zoo Network Node

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 63GB)
.NET Framework 4.8.9290.0

Computer platform: DESKTOP 

Standard graphics configuration.
  Primary display and OpenGL: NVIDIA RTX A4000 (NVidia) Memory: 16GB, Driver date: 11-13-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 553.35
    > Accelerated graphics device with 4 adapter port(s)
        - Secondary monitor attached to adapter port #0
        - Windows Main Display attached to adapter port #1

OpenGL Settings
  Safe mode: Off
  Use accelerated hardware modes: On
  GPU Tessellation is: On
  Redraw scene when viewports are exposed: On
  Graphics level being used: OpenGL 4.6 (primary GPU's maximum)
  
  Anti-alias mode: 4x
  Mip Map Filtering: Linear
  Anisotropic Filtering Mode: High
  
  Vendor Name: NVIDIA Corporation
  Render version: 4.6
  Shading Language: 4.60 NVIDIA
  Driver Date: 11-13-2024
  Driver Version: 31.0.15.5335
  Maximum Texture size: 32768 x 32768
  Z-Buffer depth: 24 bits
  Maximum Viewport size: 32768 x 32768
  Total Video Memory: 16376 MB
2

Hi @jeffoulet,

The methods does more than what it’s name describes. I believe the function also sets the file’s internal checksum if not set. We use this to determine of the file has been change or is the active file. Computing a checksum requires opening and read the file.

– Dale

3

Hi @Dale, thanks for your input.
The fact that the method needs to open the reference files could indeed explain why it takes so long.

Do you see any workaround?

4

With what is available in RhinoCommon, no.

I would think it might be slow the first time you query a reference file. Quicker after that.

– Dale