public static void Flange(Model model)
{
CompositeCurve cc1 = new CompositeCurve(
new Line(Plane.XZ, 15, 40, 29, 40),
new Arc(Plane.XZ, new Point2D(29, 39), 1, 0, Utility.DegToRad(90)),
new Line(Plane.XZ, 30, 39, 30, 16),
new Arc(Plane.XZ, new Point2D(36, 16), 6, Math.PI, Utility.DegToRad(270)),
new Line(Plane.XZ, 36, 10, 79, 10),
new Arc(Plane.XZ, new Point2D(79, 9), 1, 0, Utility.DegToRad(90)),
new Line(Plane.XZ, 80, 9, 80, 6),
new Arc(Plane.XZ, new Point2D(86, 6), 6, Utility.DegToRad(180), Utility.DegToRad(270)),
new Line(Plane.XZ, 86, 0, 130, 0));
Region reg = cc1.OffsetToRegion(5, 0, false);
Brep rev1 = reg.RevolveAsBrep(Math.PI * 2, Vector3D.AxisZ, Point3D.Origin);
model.Entities.Add(rev1, System.Drawing.Color.Aqua);
Region cssr1 = Region.CreateCircularSlot(0, Utility.DegToRad(30), 60, 8);
rev1.ExtrudeRemovePattern(cssr1, new Interval(0, 50), Point3D.Origin, Utility.DegToRad(360) / 3, 3);
Region rr1 = Region.CreateRectangle(90, -40, 50, 80);
rev1.ExtrudeRemovePattern(rr1, new Interval(0, 50), Point3D.Origin, Utility.DegToRad(360) / 2, 2);
Region cr1 = Region.CreateCircle(110, 0, 10);
const int numHoles = 8;
rev1.ExtrudeRemovePattern(cr1, 50, Point3D.Origin, Utility.DegToRad(360) / numHoles, numHoles);
model.Entities.Regen();
}