Create surface from polyline c#

Grasshopper Developer
1

Hi everyone,

I am trying to create a surface from a polyline in c# but I am stuck…

This is the code I have:

using System;
using System.Collections.Generic;
using System.Linq;
using Rhino;
using Rhino.Geometry;
using Grasshopper;
using Grasshopper.Kernel;
using Grasshopper.Kernel.Data;
using Grasshopper.Kernel.Types;

public class Script_Instance : GH_ScriptInstance
{
    private void RunScript(Polyline P, ref object S)
    {
        if (!P.IsClosed) return;

        Curve c = P.ToNurbsCurve();
        double tol = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance;

        Brep[] breps = Brep.CreatePlanarBreps(c, tol);
        if (breps != null && breps.Length > 0)
        {
            S = breps[0].Faces[0].DuplicateSurface();
        }
    }
}

In this image you can see the polyline and the result… It seems I am always creating a 4 corner surface but I do not know what is wrong…

image
image737×621 14.8 KB

Can someone take a look?

Thanks a lot!

2

look here: https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.brepface/duplicatesurface

that .DuplicateSurface() will always return the untrimmed surface.

3

Oh I see… thanks a lot, I will give it a try then without that command