​这是用Open CASCADE Technology (OCCT)库来创建一个管道模型的示例。OCCT是一个开源的几何建模库，广泛应用于CAD/CAM/CAE和其他几何建模应用中。

在下面的代码中，首先创建了一些点，并用这些点来构建B样条曲线，进而创建边(Edges)。然后，你将这些边缘添加到线(Wire)中。接着，创建了一个圆形作为管道的剖面，并将这个剖面用于生成管道。最后，使用Viewer类来显示生成的管道模型。

#include <TColgp_Array1OfPnt.hxx>
#include <BRepBuilderAPI_MakeWire.hxx>
#include <gp_Pnt.hxx>
#include"Viewer.h"
#include <GeomAPI_PointsToBSpline.hxx>
#include <Geom_BsplineCurve.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <TopoDS_Wire.hxx>
#include <gp_Ax2.hxx>
#include <gp_Circ.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <TopoDS_Face.hxx>
#include <BRepOffsetAPI_MakePipe.hxx>
​
int main(int argc, char* argv[])
{TColgp_Array1OfPnt array = TColgp_Array1OfPnt(1, 2);BRepBuilderAPI_MakeWire makeWire = BRepBuilderAPI_MakeWire();
​gp_Pnt point1 = gp_Pnt(0, 0, 0);gp_Pnt point2 = gp_Pnt(0, 0, 1);array.SetValue(1, point1);array.SetValue(2, point2);GeomAPI_PointsToBSpline spline = GeomAPI_PointsToBSpline(array);TopoDS_Edge edge = BRepBuilderAPI_MakeEdge(spline.Curve()).Edge();
​makeWire.Add(edge);
​point1 = gp_Pnt(0, 0, 1);point2 = gp_Pnt(0, 1, 2);array.SetValue(1, point1);array.SetValue(2, point2);spline = GeomAPI_PointsToBSpline(array);edge = BRepBuilderAPI_MakeEdge(spline.Curve()).Edge();
​makeWire.Add(edge);
​point1 = gp_Pnt(0, 1, 2);point2 = gp_Pnt(0, 2, 2);array.SetValue(1, point1);array.SetValue(2, point2);spline = GeomAPI_PointsToBSpline(array);edge = BRepBuilderAPI_MakeEdge(spline.Curve()).Edge();
​makeWire.Add(edge);
​makeWire.Build();TopoDS_Wire wire = makeWire.Wire();
​//the bspline profile.Profile mist be a wire / facegp_Pnt point = gp_Pnt(0, 0, 0);gp_Dir dir = gp_Dir(0, 0, 1);gp_Circ circle = gp_Circ(gp_Ax2(point, dir), 0.2);TopoDS_Edge profile_edge = BRepBuilderAPI_MakeEdge(circle).Edge();TopoDS_Wire profile_wire = BRepBuilderAPI_MakeWire(profile_edge).Wire();TopoDS_Face profile_face = BRepBuilderAPI_MakeFace(profile_wire).Face();
​//pipeTopoDS_Shape pipe = BRepOffsetAPI_MakePipe(wire, profile_face).Shape();Viewer vout(50, 50, 500, 500);vout << pipe;vout.StartMessageLoop();return 0;
}