RhinoCommon C# Brep.CreatePlanarBreps

// Hello C# World!
/*
One question : Someone knows how to fix this error : Error (CS0029): Cannot implicitly convert type ‘Rhino.Geometry.Brep’ to ‘Rhino.Geometry.Brep’ (line 90)forLoop-GridOfBreps.gh (10.1 KB) /
/

I will appreciate any explanation about how to use this method, thanks in advance!

*/

private void RunScript(double x, double y, double z, int n, double w, double h, double g, ref object A, ref object B, ref object C, ref object D)
{
//Global variables
// x, y, z // Position
int nCells = n; // how many Breps
if (nCells < 1){nCells = 1;}
double width = w;
double height = width;
double gap = g; // space between

// Empty List to collect our geometry
List <Rectangle3d> gridRectangles = new List <Rectangle3d>();
List<NurbsCurve> myCurves = new List<NurbsCurve>();
List<Brep> myBrepSurfaces = new List<Brep>();
List<Extrusion> collectBreps = new List<Extrusion>();

// for loop to generete a 2D grid of Breps
for (int i = 0; i < nCells; i++)
{
  Point3d point = new Point3d((x + i * (width + gap)), y, z);
  Vector3d vectNormal = new Vector3d(Vector3d.ZAxis);
  Plane myPlane = new Plane(point, vectNormal);

  // Grid of of Rectangles
  Rectangle3d myRect = new Rectangle3d(myPlane, width, height);
  gridRectangles.Add(myRect);

  // Convert the Rectangles to Nurbs
  // https://developer.rhino3d.com/5/api/RhinoCommon/html/M_Rhino_Geometry_Rectangle3d_ToNurbsCurve.htm
  NurbsCurve myCurve = gridRectangles[i].ToNurbsCurve();
  myCurves.Add(myCurve);

  // Create a Planar Brep Surface
  // Brep.CreatePlanarBreps Method
  // https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Brep_CreatePlanarBreps_5.htm
  Brep myBrepSurface = Brep.CreatePlanarBreps(myCurve, 0.001); // Why this line does not work?
  myBrepSurfaces.Add(myBrepSurface);

  // Extrude NurbsCurve to a Closed Brep
  // https://developer.rhino3d.com/5/api/RhinoCommon/html/M_Rhino_Geometry_Extrusion_Create.htm
  double extrudeHeight = h;//1.0;
  Extrusion myExtrusion = Extrusion.Create(myCurve, extrudeHeight, true);
  collectBreps.Add(myExtrusion);
}

A = gridRectangles;
B = myCurves;
C = myBrepSurfaces;
D = collectBreps;

}

Line 91 & 92, replace with

Brep[] myBrepSurface = Brep.CreatePlanarBreps(myCurve, 0.001); // Why this line does not work?
myBrepSurfaces.AddRange(myBrepSurface);

Here is the preview:

The RhinoCommon Command mentions that it creates array of Breps,
You were assigning just Brep instead of Brep.
And since its an array
use myBrepSurfaces.AddRange(myBrepSurface) instead of myBrepSurfaces.Add(myBrepSurface.)

1 Like

Thanks Su Lwpac! Best!

Su Lwpac

one question :

In this code myBrepSurfaces is a List of Brep
List myBrepSurfaces = new List();

And with this line:

Brep myBrepSurface = Brep.CreatePlanarBreps(myCurve, 0.001);

You get a Brep Array, right So the List.AddRange, allows us to add an Array inside the List?
It transforms an array into a List?

Thanks!

The addrange add an enumerable object for which an array is one. so you can use addrange to add each element of the array into the list.

2 Likes

Hi @andresobregonlopez, @christopher.ho has answered it properly. To Add to his explanation, Arrays are Variables which can hold multiple objects like Lists and the Way to add multiple objects to a list one needs to use AddRange() Function as explained by Christopher.
Cheers!

1 Like

Thanks @christopher.ho

Thanks @su.lwpac

using linq you can do it this way.