Hi I am trying to use my own script (i.e. the model build is done in code) and am trying to wire up the output with the Karamba Model and Analyze components, however, when I do i get the error “Data conversion failed from Goo to Model”. My script is in C# and wrapped in a simple C# grasshopper comp…

Hi @Mike26 , for registering the output-plug you need to provide this: pManager.RegisterParam(new Param_Model(), “Model”, “Model”, “New model based on inputs”); To read in the model from the first input-plug use e.g. da.GetData(0, ref inGHModel) Model model = inGHModel.Value; At the output …

From which namespaces are Param_Model GH_Model Are these Karamba specific? I am using the nuget package KarambaCommon (unsure if this includes anything grasshopper specific)

Param_Model and GH_Model are in the namespace ‘Karamba.GHopper.Models’ which can be found in ‘karamba.gha’ in the installation folder of Karamba3D. The nuget-package contains the parts of K3D which are independent of ‘RhinoCommon.dll’. – Clemens

So I need to reference the karamba.gha assembly in my .NET project?

I added a reference to the assembly but it was failing to load (unsure if this is due to the .gha extension?). I renamed the file to .dll just to see if it would load the assembly at runtime and this worked (but can’t be right?!). I now see the error [image] I did try install the 3.0.0 beta build…

Ok I have resolved my references, yes I had incorrectly installed 3.0 alongside 2.2 and there was a mismatch. I have uninstalled 3.0 and am now referencing the .gha assembly. However, I still get the error above. [image] In code I have: protected override void RegisterOutputParams(GH_Component.…

Hi @Mike26 , the error you encounter indicates, that ‘karamba.gha’ has been loaded twice into memory. In Visual studio it is not possible to reference ‘.gha’-files via the UI. Instead one needs to open the project file in a text editor and manually add the reference (see this for details) Make sur…

hmm I wonder if this was my issue: Grasshopper loads plug-ins according to the alphanumeric order of their file-names. If a component intends to use Karamba3D functionality make sure its name comes after “Karamba3D” otherwise it will not be able to reference it. Initially I had set the the referen…

I’m not sure that it just comes down to the name. Grasshopper does try to load my plugin before Karamba, I’m not sure if it is configured to load from certain paths in order? (i.e. Plug Ins → Library Folders → Yak Folders)

Did you plug-in work when you renamed it, so that it alphanumerically comes after Karamba3D? I found this link regarding the loading-order of gh-plugins: What dictates the load order for Grasshopper Plugins? - #2 by DavidRutten . You could try the approach proposed by Jon which involves splitting up…

Cannot convert from Goo to Model

Grasshopper Karamba3D

Mike26 (Mike) March 30, 2023, 8:18am 13

I can’t seem to get this to work, I thought it may load these symbols lazily, but it doesn’t.

What dictates the load order for Grasshopper Plugins?

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Cannot convert from Goo to Model

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