C#: creating mesh, invalid vertex indices

@lukert.david wrote:

Hey there,

I’m trying to create a C# component, where you input two curves and divide them x times.
The Points on the curves should be the vertices for a quadrangular mesh.
Although the preview doesn’t look that bad i get an invalid mesh as output.

The exact statement is:
Mesh: ON_Mesh.m_F [4] .vi[ ] has invalid vertex indices.

Thanks for your help!

Lukertplugintest4.gh (5.6 KB)

The Code:

private void RunScript(Curve iCurve1, Curve iCurve2, int iSegments, ref object Mesh, ref object Vertices, ref object Validity)
{

List<Point3d> ptsCurve1 = new List<Point3d>();
List<Point3d> ptsCurve2 = new List<Point3d>();

Point3d ptCurve1 = new Point3d();
Point3d ptCurve2 = new Point3d();

double spacing = 1.0 / iSegments;
double t;

// divide curves
for (int i = 0; i < iSegments; i++)
{
  t = i * spacing;
  ptCurve1 = iCurve1.PointAtNormalizedLength(t);
  ptsCurve1.Add(ptCurve1);
  ptCurve2 = iCurve2.PointAtNormalizedLength(t);
  ptsCurve2.Add(ptCurve2);
}

// reverse list if indices are on the wrong side
if (ptsCurve1[0].DistanceTo(ptsCurve2[0]) >                                                                                           ptsCurve1[0].DistanceTo(ptsCurve2[iSegments - 1]))
{
  ptsCurve2.Reverse();
}

Mesh mesh = new Mesh();

for (int i = 0; i < iSegments; i++)
{
  mesh.Vertices.Add(ptsCurve1[i]);
  mesh.Vertices.Add(ptsCurve2[i]);
}

for (int i = 0; i < mesh.Vertices.Count; i += 2)
{
  mesh.Faces.AddFace(i, i + 1, i + 3, i + 2);
}

Mesh = mesh;
Vertices = mesh.Vertices;
Validity = GH_Format.FormatMeshValidity(mesh);

}

image.png869x604 124 KB

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