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 can 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 3D 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 easily 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!");
}