Create a grasshopper group from the last N components

benedict · November 4, 2021, 3:37pm

Oh yes, I have seen that the code returns null for e.g. sliders. I reduced the problem to a simple slider.

I made it work (very simple, I wasn’t able to quickly rebuild your building solution) by using this code from this post from rolf:

// Checking the first Input param (at index = 0)
    var param = Component.Params.Input[0];
    if (param.Sources.Count < 1)
    {        
      return; // No source was connected to inport
    }

    A = param.Sources[0].InstanceGuid; // Output the Guid

which will give you the correct GUID id

I guess you need to loop through them as you set the inputs yourself.

update:

here a working code that groupes all the inputs like sliders etc (not nodes though) as soon as they are connected. this is in the solveInstance:

private void RunScript(Brep B, string M, ref object A, ref object C)
  {
    if(B == null) return;
    //get volume in metric volume
    double volcm = B.GetVolume() / 1000;
    //Component.Params.Input[1].Optional = true;

    //populate val list
    if(M == "1")
    {
      var input = Component.Params.Input[1].Sources[0]; //get the first thing connected to the first input of this component
      var valList = input as Grasshopper.Kernel.Special.GH_ValueList;
      valList.ListItems.Clear();
      List <Grasshopper.Kernel.Special.GH_ValueListItem> materials = new List<Grasshopper.Kernel.Special.GH_ValueListItem>()
        {
          new Grasshopper.Kernel.Special.GH_ValueListItem("silver ag 999", "10.49"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("silver ag 925", "10.40"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("white gold Au750Pd130", "15.80"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("white gold Au750Pd150", "	15.90"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("white gold Au750Pd210", "	16.30"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("pale gold 2N Au750Ag160", "	15.60"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("yellow gold 3N Au750Ag125", "	15.40"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("rosé gold 4N Au750Ag90", "15.30"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("red gold 5N Au750Ag45", "15.10"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("most red gold 6N Au750Ag5Pt4", "15.10"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("platine 950", "20.40"),
          new Grasshopper.Kernel.Special.GH_ValueListItem("palladium 950", "11.80")
          };
      valList.ListItems.AddRange(materials);
      Component.Params.Output[1].VolatileData.Clear();
      valList.ExpireSolution(true);
    }
    if(M == null) A = "please connect a item list node to M and select a material";
    else
    {
      A = string.Format("{0}g", Math.Round(volcm * Convert.ToDouble(M), 2));
    }

    List<Guid> guids = new List<Guid>();

    foreach(IGH_Param param in Component.Params.Input)
    {
      foreach(IGH_Param source in param.Sources)
      {
        guids.Add(source.InstanceGuid);
      }
    }


    Grasshopper.Kernel.Special.GH_Group g = new Grasshopper.Kernel.Special.GH_Group();
    g.NickName = "hhh";
    g.Colour = System.Drawing.Color.FromArgb(150, 150, 0, 0);
    GrasshopperDocument.AddObject(g, false, GrasshopperDocument.ObjectCount);
    for(int i = 0;i < guids.Count;i++) g.AddObject(guids[i]);
    g.ExpireCaches();