Moving objects from the document "space" to the grasshopper's

Grasshopper Developer
1

Hi all,
sorry for likely incorrect terms, but hopefully the idea will be clear to everybody.

I have a python node, in which I use rs.Command() function to execute my request to a custom plugin. The command generates a pair of curves. Then I can obtain the newly created objects in the document space by rs.LastCreatedObjects() to manipulate them as any other already existing document’s object. But what should I do with those objects to move those curves from the document’s space to the grasshopper’s? In other words, I need a kind of “reversed baking”. Thanks!

2

I moved this from the “Grasshopper” forum to “Grasshopper Developer” forum.

3

LastCreatedObjects() should return an array of identifiers.
In rhinoscript you can convert each identifier to a string with CStr(identifier) , not sure how with python…

If you send that string to grasshopper, you can feed it to a “Geometry” parameter:
2022-12-18 01_11_35-Grasshopper - unnamed

Or if you have the identifier/string inside your c# plugin, you can use it like:
RhinoObject obj = this.RhinoDocument.Objects.FindId((Guid) yourstringhere);
(here is a string casted to Guid)

1 Like
4

Thank you very much for the reply! Actually, it is not exactly what I mean. Sorry if my explanation is not clear. I’ve tried an approach similar to yours - just enumerated the objects received from LastCreatedObjects() and fed them to the two curve nodes. Thus, of course, I can use these curves in further nodes. But what I am looking for is rather the following: how to detach the result of the command from the document space and make it live only in grasshoper, as if it were a result of, for example, genuine grasshopper’s Line node. The rationale for that is to protect the generated curves from accident deletion or change in the Rhino’s main view. Thanks!

5

2022-12-19 11_00_30-Grasshopper - connect v0.1
2022-12-19 11_00_30-Grasshopper - connect v0.11132×197 25 KB

connect v0.1.gh (4.6 KB)

This scripts take the guid of a rhino line object and set it as persistent data to the grasshopper line parameter connected as recipient to “A”.

  private void RunScript(Guid id, ref object A)
  {
    IGH_Param IDP = (IGH_Param) this.Component.Params.Output[0].Recipients[0].Attributes.GetTopLevel.DocObject;
    if(IDP.SourceCount > 0 && id != null){
      geo = this.RhinoDocument.Objects.FindId(id).Geometry;
      if(IDP is Grasshopper.Kernel.Parameters.Param_Line){
        paramline = (Grasshopper.Kernel.Parameters.Param_Line) IDP;
        this.GrasshopperDocument.ScheduleSolution(5, Connect);
      }
    }
  }
  // <Custom additional code> 
  public Rhino.Geometry.GeometryBase geo;
  public Grasshopper.Kernel.Parameters.Param_Line paramline;
  private void Connect(GH_Document doc){
    paramline.RemoveAllSources();
    paramline.PersistentData.ClearData();
    paramline.SetPersistentData(geo);
  }
6

Thank you very much! The result looks pretty much like what I wanted, but I have no idea about C# =) will try to study the code and adapt it to my project