OCC几何求交

OCC求交工具：

（1）二维曲线求交：Geom2dAPI_InterCurveCurve

（2）三维曲线与曲面求交：GeomAPI_IntCS

（3）三维曲面与曲面求交：GeomAPI_IntSS

（4）三维曲线求交：（这里有点不太懂）通过GeomAPI_ExtremaCurveCurve用于两条曲线求机制，可用于三维曲线的求交

接口使用：

//求交
//以二维曲线求交为例
Handle(Geom2d_Line) l1 = new Geom2d_Line(gp_Pnt2d(0, 0), gp_Dir2d(1, 0));
Handle(Geom2d_Circle) l2 = new Geom2d_Circle(gp_Ax2d(gp_Pnt2d(0, 0), gp_Dir2d(0, 1)),5.0);
Geom2dAPI_InterCurveCurve intersector(l1, l2, Precision::Confusion());
for (int i = 1; i <= intersector.NbPoints(); i++) {
	gp_Pnt2d interPoint = intersector.Point(i);
	cout << "交点" << i << "为：(" << interPoint.X() << "，" << interPoint.Y() << ")" << endl;
}