Select Mesh in rhino from c++

Replies to This Discussion

Permalink Reply by Tudor Cosmatu on February 21, 2011 at 2:42am

Added the file, any suggestions?

Permalink Reply by Alexander Kalachev on February 21, 2011 at 5:41am

trying it right now

Permalink Reply by Giulio Piacentino on February 21, 2011 at 8:37am

Hi Tudor,

Grasshopper is an interface to the Rhino SDK. In this case, the SDK does not expose a method to do this operation, so it's painful to do this and very difficult to do it properly in any language (in this case, the language is C# -- read c sharp).

Anyways, to make the code work, what you still need is a way to select the objects from the document. The following code might be a beginning for this last operation:

---

 

RMA.Rhino.MRhinoObjectIterator iterator =
      new RMA.Rhino.MRhinoObjectIterator(IRhinoObjectIterator.object_state.normal_objects,
      IRhinoObjectIterator.object_category.active_objects);
    iterator.EnableSelectedFilter(true);

    List<IOnMesh> meshes = new List<IOnMesh>();
    RMA.Rhino.MRhinoObject current;
    while((current = iterator.Next()) != null)
    {
      IOnGeometry g = current.Geometry();
      if(g != null && g.ObjectType() == IOn.object_type.mesh_object)
      {

        IOnMesh tmp = OnMesh.ConstCast(g);

        if(tmp != null)
             meshes.Add(tmp);
      }
    }

    A = meshes;

 

---

 

- Giulio

____________

giulio@mcneel.com
McNeel Europe, Barcelona

Attachments:

• selection.ghx, 31 KB

Permalink Reply by Tudor Cosmatu on February 21, 2011 at 8:47am

!!!!!!! Thank you Giulio !!!!!!!

 

That piece of code does more then i was expecting to get !!! thank you for your time, code and explanation!

 

All the best,

Tudor

Permalink Reply by David Rutten on February 21, 2011 at 1:42pm

This is way too difficult in RhinoCommon. I just added a bunch of functions that should make it easier. Starting from the next release, you should be able to write the following in the new C# component:

 

private void RunScript(List<Point3d> pts, bool run, ref object A)  

{    

  if (!run) { return; }    

  if (pts == null) { return; }    

  if (pts.Count < 3) { return; }

  //Unselect all objects    

  doc.Objects.UnselectAll();

  //Then, bake the objects and remember all the IDs so we can delete them properly    

  List<Guid> pointIDs = new List<Guid>(pts.Count);    

  for (int i = 0; i < pts.Count; i++)    

  {      

    if (pts[i].IsValid) { pointIDs.Add(doc.Objects.AddPoint(pts[i])); }

  }

  if (pointIDs.Count < 3)    

  {      

    Print("Insufficient valid points for a Mesh");      

    doc.Objects.Delete(pointIDs, true);      

    return;    

  }

 

  //Now run the MeshFromPoints command    

  doc.Objects.Select(pointIDs);

  if (RhinoApp.RunScript("-_MeshfromPoints _Enter", false))    

  {      

    //If the script was successfully run, search for the most recently added object

    Rhino.DocObjects.RhinoObject obj = doc.Objects.MostRecentObject();

    A = obj.Geometry.Duplicate();
    doc.Objects.Delete(obj, true);

  }

 

  //Now delete the points

  doc.Objects.Delete(pointIDs, true);  

}

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Tudor Cosmatu on February 22, 2011 at 2:44am

Thank you David!

will give it a try as soon as the new release is out. Any hints on when the new release will come out? :P

 

The code i stitched together is, for now, doing what i was hoping for, but can't wait to see the one above doing its magic. 

 

cheers!

 

Permalink Reply by David Rutten on February 22, 2011 at 4:38am

I'm hoping to upload a beta release to the VB/C# forum today or maybe tomorrow. There have been a number of SDK breaks and I want to give GHA developers the opportunity to have a look at potential problems before I release publicly. 

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Tudor Cosmatu on February 22, 2011 at 4:41am

That s great news! :)

 

Waiting for the beta then!

 

 

Permalink Reply by Tudor Cosmatu on February 22, 2011 at 12:07pm

hello david,

 

thought to get back with some "news". tried your code, it's working, but seems to take a lot longer/ sometimes crashing gh. 

 

For example your code on the same set of points takes (according to the profiler) :

28002 ms to compute while the other one takes 1810 ms. 

 

here s a snapshot

Permalink Reply by David Rutten on February 22, 2011 at 12:26pm

This is a debug build of Grasshopper, you cannot compare it with a Release build. Let's wait until the proper version is released and then we can start optimizing :)

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Tudor Cosmatu on February 22, 2011 at 12:28pm

cool! sounds like a plan :P

 

anyway, thank you as always, the new build looks very promising (especially the long list of changes)!!