occ 由多个点画一个面

//插入点
....
vec.push_back(gp_Pnt(xxx));
....

 //画
BRepBuilderAPI_MakePolygon  polygon;
    for (int i = 0; i < vec.size(); i++)
    {
        polygon.Add(vec[i]);
    }
    if (polygon.IsDone()) {
        polygon.Close();
        auto wire = polygon.Wire();
        BRepBuilderAPI_MakeFace face(wire, true);

        if (face.IsDone())
        {
            if (face.Error() != BRepBuilderAPI_FaceDone)
            {
                qDebug() << " make face error " << face.Error();
                return nullptr;
            }
            if (face.Shape().IsNull())
            {
                qDebug() << "face is null";
                return nullptr;
            }
            TopoDS_Shape sr = BRepPrimAPI_MakePrism(face, vector, true);
            return std::shared_ptr<TopoDS_Shape>(new TopoDS_Shape(sr));
        }
    }
    return nullptr;