Clean cobwesh meshes in three js and Rhino C#.

cobweb.cs

    Mesh M = new Mesh();
    int axis_divisions = 100;
    int height_divisions = 200;

    M.Vertices.Capacity = axis_divisions * height_divisions;
    M.Faces.Capacity = 2 * (axis_divisions * (height_divisions - 1));

    for (int th = 0; th < axis_divisions; th++)
    {
      double x = Math.Cos(2.0 * Math.PI * th / (double) axis_divisions);
      double y = Math.Sin(2.0 * Math.PI * th / (double) axis_divisions);

      for (int h = 0; h < height_divisions; h++)
      {
        double z = (0.1 + (double) h / (double) (height_divisions - 1)) / 1.1;
        M.Vertices.Add(z * x, z * y, 0);
      }
    }

    for (int th = 0; th < axis_divisions; th++)
    {
      for (int h = 1; h < height_divisions; h++)
      {
        M.Faces.AddFace(
          ((th + 0) % axis_divisions) * height_divisions + (h - 1),
          ((th + 1) % axis_divisions) * height_divisions + (h - 1),
          ((th + 0) % axis_divisions) * height_divisions + (h + 0)
          );

        M.Faces.AddFace(
          ((th + 1) % axis_divisions) * height_divisions + (h - 1),
          ((th + 1) % axis_divisions) * height_divisions + (h + 0),
          ((th + 0) % axis_divisions) * height_divisions + (h + 0)
          );
      }
    }

cobweb.js

var M = new THREE.Geometry();
var axis_divisions = 100;
var height_divisions = 200;
    for (var th = 0; th < axis_divisions; th++)
    {
      var x = Math.cos(2.0 * Math.PI * th / axis_divisions);
      var y = Math.sin(2.0 * Math.PI * th / axis_divisions);

      for (var h = 0; h < height_divisions; h++)
      {
        var z = (0.1 + h / (height_divisions - 1)) / 1.1;
        M.vertices.push(new THREE.Vector3(z * x, z * y, 0));
      }
    }

    for (th = 0; th < axis_divisions; th++)
    {
      for (h = 1; h < height_divisions; h++)
      {
        M.faces.push(
            new THREE.Face3(
          ((th + 0) % axis_divisions) * height_divisions + (h - 1),
          ((th + 1) % axis_divisions) * height_divisions + (h - 1),
          ((th + 0) % axis_divisions) * height_divisions + (h + 0)
          ));

        M.faces.push(
            new THREE.Face3(
          ((th + 1) % axis_divisions) * height_divisions + (h - 1),
          ((th + 1) % axis_divisions) * height_divisions + (h + 0),
          ((th + 0) % axis_divisions) * height_divisions + (h + 0)
          ));
      }
    }