.NET

Version: Rhino 4

I have a standalone C# application that automates Rhino by creating a Rhino4.Application object and then obtaining a reference to the RhinoScript COM object. I am able to perform simple operations, such as scripting commands via the Command method and adding lines via the AddLine method. But I am unable to use any RhinoScript method where I need to pass in an array of 3-D points, which in RhinoScript are really arrays of arrays of doubles. Is there a way to call RhinoScript's AddMesh method from C#?

Simple data types, such as integers and doubles are easly marshalled between .NET and COM because their values can be easily converted to the Object .NET data type. Array are a little more difficult to deal with, but not impossible. The .NET array classes have a ToArray member that will copy the elements of the array to a new Object array. A .NET Object array will marshall to COM as a SafeArray.

The following example demonstrates how to call RhinoScript's AddMesh method from a standalone application:

C#

   static void Main(string[] args)
   {
     ///////////////////////////////////////////
      Create Rhino application object
     Console.Write("Creating Rhino object...");
     Rhino4.Application objRhino = new Rhino4.Application();
     if (objRhino == null)
     {
       Console.WriteLine("failed.");
       return;
     }
     else
     {
       Console.WriteLine("succeeded.");
     }

     ///////////////////////////////////////////
      Retrieve RhinoScript object
     Console.Write("Retrieving RhinoScript object...");
     RhinoScript4.IRhinoScript objRhinoScript = null;
     int count = 0;
     System.Threading.Thread.Sleep(500);
     while (count < 10)
     {
       object obj = objRhino.GetScriptObject();
       if (obj != null)
       {
         objRhinoScript = (RhinoScript4.IRhinoScript)obj;
         if (objRhinoScript != null)
           break;
       }
       System.Threading.Thread.Sleep(500);
       count++;
     }

     if (objRhinoScript == null)
     {
       Console.WriteLine("failed.");
       return;
     }
     else
     {
       Console.WriteLine("succeeded.");
     }

     ///////////////////////////////////////////
      Create mesh data
     Console.Write("Adding mesh object...");

     ///////////////////////////////////////////
      Mesh vertices
     ArrayList vertices = new ArrayList();

     ArrayList v0 = new ArrayList();
     v0.Add(0.0);
     v0.Add(0.0);
     v0.Add(0.0);
     vertices.Add(v0.ToArray());

     ArrayList v1 = new ArrayList();
     v1.Add(10.0);
     v1.Add(0.0);
     v1.Add(0.0);
     vertices.Add(v1.ToArray());

     ArrayList v2 = new ArrayList();
     v2.Add(10.0);
     v2.Add(10.0);
     v2.Add(0.0);
     vertices.Add(v2.ToArray());

     ArrayList v3 = new ArrayList();
     v3.Add(0.0);
     v3.Add(10.0);
     v3.Add(0.0);
     vertices.Add(v3.ToArray());

     ///////////////////////////////////////////
      Mesh faces
     ArrayList faces = new ArrayList();

     ArrayList f0 = new ArrayList();
     f0.Add(0);
     f0.Add(1);
     f0.Add(2);
     f0.Add(3);
     faces.Add(f0.ToArray());

     ///////////////////////////////////////////
      Mesh normals
     ArrayList normals = new ArrayList();

     ArrayList n0 = new ArrayList();
     n0.Add(0.0);
     n0.Add(0.0);
     n0.Add(1.0);
     normals.Add(n0.ToArray());

     ArrayList n1 = new ArrayList();
     n1.Add(0.0);
     n1.Add(0.0);
     n1.Add(1.0);
     normals.Add(n1.ToArray());

     ArrayList n2 = new ArrayList();
     n2.Add(0.0);
     n2.Add(0.0);
     n2.Add(1.0);
     normals.Add(n2.ToArray());

     ArrayList n3 = new ArrayList();
     n3.Add(0.0);
     n3.Add(0.0);
     n3.Add(1.0);
     normals.Add(n3.ToArray());

     ///////////////////////////////////////////
      Texture coordinates
     ArrayList textures = new ArrayList();

     ArrayList t0 = new ArrayList();
     t0.Add(0.0);
     t0.Add(0.0);
     textures.Add(t0.ToArray());

     ArrayList t1 = new ArrayList();
     t1.Add(1.0);
     t1.Add(0.0);
     textures.Add(t1.ToArray());

     ArrayList t2 = new ArrayList();
     t2.Add(1.0);
     t2.Add(1.0);
     textures.Add(t2.ToArray());

     ArrayList t3 = new ArrayList();
     t3.Add(0.0);
     t3.Add(0.1);
     textures.Add(t3.ToArray());

     ///////////////////////////////////////////
      Vertex colors
     ArrayList colors = new ArrayList();
     colors.Add(0);
     colors.Add(0);
     colors.Add(0);
     colors.Add(0);

     ///////////////////////////////////////////
      Call AddMesh

      If you want to pass in everything, then do this:
     
      object obj_uuid_str = objRhinoScript.AddMesh(
        vertices.ToArray(),
        faces.ToArray(),
        normals.ToArray(),
        textures.ToArray(),
        colors.ToArray()
        );

      If you do not want to pass in optional argument,
      then pass "System.Reflection.Missing.Value".
     
     object obj_uuid_str = objRhinoScript.AddMesh(
       vertices.ToArray(),
       faces.ToArray(),
       System.Reflection.Missing.Value,
       System.Reflection.Missing.Value,
       System.Reflection.Missing.Value
       );

     Console.WriteLine(obj_uuid_str.ToString());

     ///////////////////////////////////////////
      Save the file
     Console.WriteLine("Saving test file.");
     objRhinoScript.Command("_-Save c:\\test.3dm", 0);

     Console.WriteLine("Done!");
   }