openVolumeMesh example 程序学习

简介

参考链接
openVolumeMesh 官网链接
https://www.graphics.rwth-aachen.de/software/openvolumemesh/download/
中国科技大学 - Volumetric Mesh Framework
http://staff.ustc.edu.cn/~fuxm/code/index.html

code

// C++ includes
#include <iostream>
#include <vector>

// Include vector classes
#include <OpenVolumeMesh/Geometry/VectorT.hh>

// Include polyhedral mesh kernel
#include <OpenVolumeMesh/Mesh/PolyhedralMesh.hh>
#include <OpenVolumeMesh/FileManager/FileManager.hh>
// Make some typedefs to facilitate(使...容易) your life
typedef OpenVolumeMesh::Geometry::Vec3f         Vec3f;// 顶点的结构体
typedef OpenVolumeMesh::GeometryKernel<Vec3f>   PolyhedralMeshV3f; // 体的定义
int main(int _argc, char** _argv) {

    // Create mesh object
    PolyhedralMeshV3f myMesh;

    // Add eight(可能作者想生成一个体但是并没有，生成了一个四棱锥) vertices
    OpenVolumeMesh::VertexHandle v0 = myMesh.add_vertex(Vec3f(-1.0, 0.0, 0.0));
    OpenVolumeMesh::VertexHandle v1 = myMesh.add_vertex(Vec3f( 0.0, 0.0, 1.0));
    OpenVolumeMesh::VertexHandle v2 = myMesh.add_vertex(Vec3f( 1.0, 0.0, 0.0));
    //OpenVolumeMesh::VertexHandle v3 = myMesh.add_vertex(Vec3f( 0.0, 0.0,-1.0));
    OpenVolumeMesh::VertexHandle v4 = myMesh.add_vertex(Vec3f( 0.0, 1.0, 0.0));
    
    std::vector<OpenVolumeMesh::VertexHandle> vertices;
    
    // Add faces
    vertices.push_back(v0); vertices.push_back(v1);vertices.push_back(v4);
    OpenVolumeMesh::FaceHandle f0 = myMesh.add_face(vertices);
    
    vertices.clear();
    vertices.push_back(v1); vertices.push_back(v2);vertices.push_back(v4);
    OpenVolumeMesh::FaceHandle f1 = myMesh.add_face(vertices);
    
    vertices.clear();
    vertices.push_back(v0); vertices.push_back(v1);vertices.push_back(v2);
    OpenVolumeMesh::FaceHandle f2 = myMesh.add_face(vertices);
    
    vertices.clear();
    vertices.push_back(v0); vertices.push_back(v4);vertices.push_back(v2);
    OpenVolumeMesh::FaceHandle f3 = myMesh.add_face(vertices);
    
    //vertices.clear();
    //vertices.push_back(v0); vertices.push_back(v4);vertices.push_back(v3);
    //OpenVolumeMesh::FaceHandle f4 = myMesh.add_face(vertices);
    //
    //vertices.clear();
    //vertices.push_back(v2); vertices.push_back(v3);vertices.push_back(v4);
    //OpenVolumeMesh::FaceHandle f5 = myMesh.add_face(vertices);
    //
    //vertices.clear();
    //vertices.push_back(v0); vertices.push_back(v2);vertices.push_back(v3);
    //OpenVolumeMesh::FaceHandle f6 = myMesh.add_face(vertices);
    
    std::vector<OpenVolumeMesh::HalfFaceHandle> halffaces;
    
    // Add first tetrahedron
    halffaces.push_back(myMesh.halfface_handle(f0, 1));
    halffaces.push_back(myMesh.halfface_handle(f1, 1));
    halffaces.push_back(myMesh.halfface_handle(f2, 0)); 
    halffaces.push_back(myMesh.halfface_handle(f3, 1)); 
    myMesh.add_cell(halffaces);
    
    // Add second tetrahedron
    //halffaces.clear();
    //halffaces.push_back(myMesh.halfface_handle(f4, 1));
    //halffaces.push_back(myMesh.halfface_handle(f5, 1));
    //halffaces.push_back(myMesh.halfface_handle(f3, 0)); 
    //halffaces.push_back(myMesh.halfface_handle(f6, 0)); 
    //myMesh.add_cell(halffaces);

    // Print positions of vertices to std out
    for(OpenVolumeMesh::VertexIter v_it = myMesh.vertices_begin();
            v_it != myMesh.vertices_end(); ++v_it) {

        std::cout << "Position of vertex " << v_it->idx() << ": " <<
            myMesh.vertex(*v_it) << std::endl;
    }
	OpenVolumeMesh::IO::FileManager fileManager;
	fileManager.writeFile("test.ovm", myMesh);
	// save_mesh_graph("test.ovm", myMesh);

    return 0;
}

TIPS

经过简单的修改，生成了一个四面体，原本有两个四面体，如果自己做验证的话会不清晰。
文件还算清晰

1. 首先生成点
2. 根据点的索引生成面
3. 根据面的索引生成cell（小块）

自问自答

QU: myMesh.halfface_handle(fx, 1) 第二个参数有的是1 有的是0 是什么意思？？
AN：猜测使用右手螺旋定则，得到法向量，也就是面的朝向。

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