public void CreateSpline()
{
Point3d[] pt = new Point3d[4];
pt[0] = new Point3d(0, 0, 0);
pt[1] = new Point3d(10, 0, 0);
pt[2] = new Point3d(30, 20, 0);
pt[3] = new Point3d(60, 50, 0);
Point3dCollection pts = new Point3dCollection(pt);
ObjectId splineId = ModelSpace.AddSpline(pts);
}
