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1
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#include <Gmsh.h>
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2
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#include <vector>
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3
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4
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int main() {
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5
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// 初始化Gmsh
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6
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gmsh::initialize();
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7
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8
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// 创建一个新的模型
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9
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gmsh::model::add("complex_shape");
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10
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11
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// 定义曲面1的三角片
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12
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std::vector<std::vector<int>> triangles1 = {
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13
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{1, 2, 3},
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14
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{3, 4, 1}
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15
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};
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16
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17
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// 定义曲面2的三角片
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std::vector<std::vector<int>> triangles2 = {
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19
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{5, 6, 7},
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20
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{7, 8, 5}
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21
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};
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22
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23
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// 添加曲面1的顶点和三角片
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std::vector<double> coordinates1 = {
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25
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0.0, 0.0, 0.0, // 顶点1
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1.0, 0.0, 0.0, // 顶点2
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27
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1.0, 1.0, 0.0, // 顶点3
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28
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0.0, 1.0, 0.0 // 顶点4
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29
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};
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for (size_t i = 0; i < coordinates1.size() / 3; ++i) {
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gmsh::model::geo::addPoint(coordinates1[3*i], coordinates1[3*i+1], coordinates1[3*i+2], 0.1, i+1);
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32
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}
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33
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for (const auto& triangle : triangles1) {
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34
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gmsh::model::geo::addLine(triangle[0], triangle[1], 10 + (&triangle - &triangles1[0]) * 3);
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35
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gmsh::model::geo::addLine(triangle[1], triangle[2], 11 + (&triangle - &triangles1[0]) * 3);
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gmsh::model::geo::addLine(triangle[2], triangle[0], 12 + (&triangle - &triangles1[0]) * 3);
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}
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38
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std::vector<int> lines1 = {10, 11, 12, 13};
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39
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gmsh::model::geo::addCurveLoop(lines1, 20);
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40
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// 添加曲面2的顶点和三角片
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42
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std::vector<double> coordinates2 = {
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1.0, 1.0, 0.0, // 顶点5（与曲面1的顶点3共享）
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2.0, 1.0, 0.0, // 顶点6
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45
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2.0, 2.0, 0.0, // 顶点7
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1.0, 2.0, 0.0 // 顶点8
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};
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48
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for (size_t i = 0; i < coordinates2.size() / 3; ++i) {
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49
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int pointTag = i + 1 + coordinates1.size() / 3; // 顶点标签从曲面1的最后一个顶点之后开始
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50
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gmsh::model::geo::addPoint(coordinates2[3*i], coordinates2[3*i+1], coordinates2[3*i+2], 0.1, pointTag);
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}
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for (const auto& triangle : triangles2) {
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gmsh::model::geo::addLine(triangle[0], triangle[1], 20 + (&triangle - &triangles2[0]) * 3);
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54
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gmsh::model::geo::addLine(triangle[1], triangle[2], 21 + (&triangle - &triangles2[0]) * 3);
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gmsh::model::geo::addLine(triangle[2], triangle[0], 22 + (&triangle - &triangles2[0]) * 3);
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56
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}
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std::vector<int> lines2 = {20, 21, 22, 23};
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58
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gmsh::model::geo::addCurveLoop(lines2, 30);
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59
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60
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// 添加实体
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std::vector<int> surfaceTags = {20, 30};
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gmsh::model::geo::addVolume({surfaceTags}, 40);
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63
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// 设置网格划分参数
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gmsh::model::mesh::setAlgorithm(gmsh::mesh::algorithm::FRONT_DELAUNAY, 0);
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gmsh::model::mesh::setSize(gmsh::mesh::size::LCAR, 0.1);
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67
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68
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// 执行网格划分
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69
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gmsh::model::mesh::generate(3);
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70
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// 保存网格到文件
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gmsh::write("complex_shape.msh");
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73
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// 清理并退出Gmsh
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75
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gmsh::finalize();
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76
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77
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return 0;
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78
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}
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