Brep.CapPlanarHoles does not work in C#

Rhino Developer
,
#1

Hello everybody,

In a C# component for GH, I want to split a closed Brep into several closed Breps.
First I use the Brep.Split operation with the cutter I want. This works fine. It results in open Brep, that Ii want to close in a next step.
To do so, I used Brep.CapPlanarHoles but it does nothing.

What’s really annoying is that:

  • If I bake the open brep and use the Rhino command CapHoles it works perfectly
  • If I add the GH internal component Cap Holes, it also works.

The problem is that I want to do it all in C# for a bigger component.

Thanks a lot,
Nathanaël

PS: Here is the code
//Creation of the Brep

  • Point3d O = new Point3d(0, 0, 0);*

  • Point3d P = new Point3d(200, 40, 20);*

  • BoundingBox Bl_temp = new BoundingBox(O, P);*

  • Brep brep = Brep.CreateFromBox(Bl_temp);*

  • // Creation of the cutter for the lintel (initialisation)*

  • Vector3d x_vector = new Vector3d(200, 0, 0);*

  • Point3d L_1 = new Point3d(0, 0, -5);//Cutter extends a bit out of the layer (z-direction) to avoid problems when splitting*

  • Point3d L_2 = new Point3d(0, 0, 25);//Cutter extends a bit out of the layer (z-direction) to avoid problems when splitting*

  • List Points = new List();*

  • Points.Add(L_1);*

  • Points.Add(L_2);*

  • Curve line = Curve.CreateControlPointCurve(Points, 1);*

  • Surface Cutter = Surface.CreateExtrusion(line, x_vector);*

  • //Creation of the list of cutters*

  • List Cutters = new List (); //List of cutters*

  • for (int i = 0;i < 3;i++){*

  •  L_1.Y = L_1.Y + 10;*

  •  L_2.Y = L_1.Y;*

  •  List <Point3d> Points_temp = new List<Point3d>();*

  •  Points_temp.Add(L_1);*

  •  Points_temp.Add(L_2);*

  •  Curve line_temp = Curve.CreateControlPointCurve(Points_temp, 1);*

  •  Surface Cutter_temp = Surface.CreateExtrusion(line_temp, x_vector);*

  •  Cutters.Add(Cutter_temp.ToBrep());*

  • }*

  • A = Cutters;*

  • B = brep;*

  • //Cutting process*

  • Brep Brep_temp = brep.Split(Cutters, 1E-6);*

  • Brep bl_temp = Brep_temp[2];*

  • bl_temp.CapPlanarHoles(1E-6);*

  • C = bl_temp;*

#2

Moved to Developer category

#3

Hello
not very cool you didn’t post the Grasshopper Component.
In order to post code put 3 signs (on the 7 key on my keyboard)
image

For your problem you must use the output of bl_temp.CapPlanarHoles()

image
image755×216 9.54 KB

    Point3d O = new Point3d(0, 0, 0);
    Point3d P = new Point3d(200, 40, 20);
    BoundingBox Bl_temp = new BoundingBox(O, P);
    Brep brep = Brep.CreateFromBox(Bl_temp);
    // Creation of the cutter for the lintel (initialisation)*
    Vector3d x_vector = new Vector3d(200, 0, 0);
    Point3d L_1 = new Point3d(0, 0, -5);//Cutter extends a bit out of the layer (z-direction) to avoid problems when splitting
    Point3d L_2 = new Point3d(0, 0, 25);//Cutter extends a bit out of the layer (z-direction) to avoid problems when splitting
    List<Point3d> Points = new List<Point3d>();
    Points.Add(L_1);
    Points.Add(L_2);
    Curve line = Curve.CreateControlPointCurve(Points, 1);
    Surface Cutter = Surface.CreateExtrusion(line, x_vector);
    //Creation of the list of cutters*
    List<Brep> Cutters = new List<Brep> (); //List of cutters*
    for (int i = 0;i < 3;i++)
    {
      L_1.Y = L_1.Y + 10;
      L_2.Y = L_1.Y;
      List < Point3d > Points_temp = new List<Point3d>();
      Points_temp.Add(L_1);
      Points_temp.Add(L_2);
      Curve line_temp = Curve.CreateControlPointCurve(Points_temp, 1);
      Surface Cutter_temp = Surface.CreateExtrusion(line_temp, x_vector);
      Cutters.Add(Cutter_temp.ToBrep());
    }
    //A = Cutters;
    // B = brep;
    //Cutting process*
    Brep[] Brep_temp = brep.Split(Cutters, 1E-6);
    List < Brep > outputs = new List<Brep>();
    foreach (Brep bl_temp in Brep_temp)
    {
      if (bl_temp != null && bl_temp.IsValid)
      {
        outputs.Add(bl_temp.CapPlanarHoles(1E-6));
      }
    }

    C = outputs;

cut brep.gh (3.5 KB)

#4

Hello Laurent,
Thanks a lot for the reply despite the bad quality of the post. To be honest, it’s my first post and I did not really saw where to share the GH component. That’s why I put (badly) the C# code. My next topic (if any) will be much better.

Thanks for the help. I understand the problem now. It’s really stupid… Anyway.

Have a nice day,

Nathanaël

#5

hello
No it is not stupid it is also quite common. Sometimes function creates new objects sometime not. In rhinoceros cap is not creating new object.
Welcome to the C#