OCC开发_箱梁梁体建模

本文主要是介绍OCC开发_箱梁梁体建模，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

概述

    OCC(全称OpenCascade)是一个近年来比较受欢迎的开源三维CAD建模平台，曲线、曲面、实体、渲染等方面功能强大，并且在机械、航空、船舶等许多领域应用广泛。基于OCC的强大功能考虑，本人尝试将其引入桥梁领域。桥梁设计中，比较常见的梁体类型是箱梁，因此本文将在OCC上实现箱梁梁体建模。

基本思路

实现箱梁梁体建模步骤如下：

1. 通过点创建闭合的外轮廓(顺时针)，生成面；
2. 通过点创建内轮廓(逆时针)，对面掏洞处理(多箱室时，遍历多次)；
3. 生成的面沿路径拉伸，生成体；
4. 保存为.Brep文件；
5. 查看效果。

本文只介绍箱梁实现思路，如果对开发环境搭建有疑问的，请查看其他资料。

代码实现

本功能用C++实现，具体业务代码如下：

#include <vector>
#include <tuple>
#include <gp_Pnt.hxx>
#include <gp_Circ.hxx>
#include <TopTools_ListOfShape.hxx>
#include <BRepTools.hxx>
#include <BRep_Tool.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_MakeWire.hxx>
#include <BRepPrimAPI_MakeBox.hxx>
#include <BRepPrimAPI_MakePrism.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <ShapeAnalysis_Edge.hxx>
#include <ShapeAnalysis_WireOrder.hxx>
#include <AIS_Shape.hxx>
#pragma comment(lib, "TKernel.lib")
#pragma comment(lib, "TKMath.lib")
#pragma comment(lib, "TKG2d.lib")
#pragma comment(lib, "TKG3d.lib")
#pragma comment(lib, "TKGeomBase.lib")
#pragma comment(lib, "TKGeomAlgo.lib")
#pragma comment(lib, "TKBRep.lib")
#pragma comment(lib, "TKTopAlgo.lib")
#pragma comment(lib, "TKShHealing.lib")//通过初始数据生成边
std::vector<TopoDS_Edge> GetEdges(std::vector<std::tuple <double, double, double>> tuples)
{std::vector<TopoDS_Edge> anEdges;for (int i = 0; i < tuples.size(); ++i){int i1 = i;int i2 = (i + 1) % tuples.size();BRepBuilderAPI_MakeEdge tempRdge(gp_Pnt(std::get<0>(tuples[i1]), std::get<1>(tuples[i1]), std::get<2>(tuples[i1])),gp_Pnt(std::get<0>(tuples[i2]), std::get<1>(tuples[i2]), std::get<2>(tuples[i2])));anEdges.push_back(tempRdge.Edge());}return anEdges;
}//生成外轮廓
std::vector<TopoDS_Edge> GetOuterEdges()
{std::vector<std::tuple <double, double, double>> tuples;tuples.push_back(std::make_tuple(-800, 0, 0.0));tuples.push_back(std::make_tuple(800, 0, 0.0));tuples.push_back(std::make_tuple(800, -20, 0.0));tuples.push_back(std::make_tuple(550.0, -80, 0.0));tuples.push_back(std::make_tuple(550.0, -600, 0.00));tuples.push_back(std::make_tuple(-550.0, -600, 0.0));tuples.push_back(std::make_tuple(-550.0, -80, 0.0));tuples.push_back(std::make_tuple(-800.0, -20, 0.0));return GetEdges(tuples);
}//生成内轮廓列表
std::vector<std::vector<TopoDS_Edge> > GetInnerEdgesList()
{std::vector<std::tuple <double, double, double>> innerTuples1;innerTuples1.push_back(std::make_tuple(-460, -30, 0.0));innerTuples1.push_back(std::make_tuple(-490, -60, 0.0));innerTuples1.push_back(std::make_tuple(-490, -540, 0.0));innerTuples1.push_back(std::make_tuple(-460, -570, 0.0));innerTuples1.push_back(std::make_tuple(-60, -570, 0.0));innerTuples1.push_back(std::make_tuple(-30, -540, 0.0));innerTuples1.push_back(std::make_tuple(-30, -60, 0.0));innerTuples1.push_back(std::make_tuple(-60, -30, 0.0));std::vector<TopoDS_Edge> innerEdges1 = GetEdges(innerTuples1);std::vector<std::tuple <double, double, double>> innerTuples2;innerTuples2.push_back(std::make_tuple(60, -30, 0.0));innerTuples2.push_back(std::make_tuple(30, -60, 0.0));innerTuples2.push_back(std::make_tuple(30, -540, 0.0));innerTuples2.push_back(std::make_tuple(60, -570, 0.0));innerTuples2.push_back(std::make_tuple(460, -570, 0.0));innerTuples2.push_back(std::make_tuple(490, -540, 0.0));innerTuples2.push_back(std::make_tuple(490, -60, 0.0));innerTuples2.push_back(std::make_tuple(460, -30, 0.0));std::vector<TopoDS_Edge> innerEdges2 = GetEdges(innerTuples2);std::vector<std::vector<TopoDS_Edge> > innerEdgesList;innerEdgesList.push_back(innerEdges1);innerEdgesList.push_back(innerEdges2);return innerEdgesList;
}//通过边生成BRepBuilderAPI_MakeWire
BRepBuilderAPI_MakeWire GetWire(std::vector<TopoDS_Edge> outerEdges)
{TopTools_ListOfShape aOrderedEdges = GetShape(outerEdges);BRepBuilderAPI_MakeWire aWireMaker;aWireMaker.Add(aOrderedEdges);return aWireMaker;
}//通过边生成形状
TopTools_ListOfShape GetShape(std::vector<TopoDS_Edge> edges)
{TopTools_ListOfShape aOrderedEdges;for (int e = 0; e < edges.size(); ++e){const TopoDS_Edge& anEdge = edges[e];aOrderedEdges.Append(anEdge);}return aOrderedEdges;
}//生成箱梁
void GenerateBoxBeam(void)
{std::vector<TopoDS_Edge> outerEdges = GetOuterEdges();std::vector<std::vector<TopoDS_Edge> > innerEdgesList = GetInnerEdgesList();BRepBuilderAPI_MakeWire aWireMaker= GetWire(outerEdges);BRepBuilderAPI_MakeFace face1(aWireMaker);//外轮廓生成面for (int i = 0; i < innerEdgesList.size(); i++){BRepBuilderAPI_MakeWire aWireMaker1= GetWire(innerEdgesList[i]);if (!aWireMaker1.IsDone()) continue;face1.Add(aWireMaker1.Wire());//剪切内轮廓开洞}TopoDS_Shape S = BRepPrimAPI_MakePrism(face1, gp_Vec(0.0, 0.0, 200));//拉伸BRepTools::Write(S, "d:/wire.brep");//保存文件
}//主函数
int main(int argc, char* argv[])
{GenerateBoxBeam();return 0;
}

实现效果

将生成的.Brep文件用安装目录下的Import Export打开，模型如下图：

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