生成球 使用openMesh 库

简介

使用openmesh生成一个球，采用的是标准球坐标系。

// 生成球  n 最好输入偶数  10 或者 100 
#include <iostream>
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
#include<cmath>
#define pi 3.1415926
using namespace std;
typedef OpenMesh::TriMesh_ArrayKernelT<> MyMesh;int main()
{MyMesh mesh;int n,count=10000,k=-1;cout << "n:";cin >> n;MyMesh::VertexHandle *vhandle = new MyMesh::VertexHandle[count];std::vector<MyMesh::VertexHandle>face_vhandles;for (int j =0;j < n;j++) {double distance = cos(j*pi / n);// 原先是 sindouble r_circle = sin(j*pi / n);for (int i = 0;i < n;i++) {++k;vhandle[k]=mesh.add_vertex(MyMesh::Point(r_circle*cos(2 * i*pi / n), r_circle*sin(2 * i*pi / n), distance));// 对网格添加顶点}}for (int i = 0;i < n-1;i++) {for (int j = 0;j < n;j++) {int topRight = i * n + j;int topLeft = i * n + (j + 1) % n;int bottomRight = (i + 1)*n + j;int bottomLeft = (i + 1)*n + (j + 1) % n;face_vhandles.clear();face_vhandles.push_back(vhandle[bottomRight]);face_vhandles.push_back(vhandle[bottomLeft]);face_vhandles.push_back(vhandle[topRight]);mesh.add_face(face_vhandles);face_vhandles.clear();face_vhandles.push_back(vhandle[bottomLeft]);face_vhandles.push_back(vhandle[topLeft]);face_vhandles.push_back(vhandle[topRight]);mesh.add_face(face_vhandles);}}//vhandle[k+1] = mesh.add_vertex(MyMesh::Point(0, 0, 1));vhandle[k+1] = mesh.add_vertex(MyMesh::Point(0, 0, -1));for (int i = 0;i < n;i++) {//face_vhandles.clear();//////face_vhandles.push_back(vhandle[i]);//face_vhandles.push_back(vhandle[(i + 1) % n]);//face_vhandles.push_back(vhandle[k + 2]);//mesh.add_face(face_vhandles);face_vhandles.clear();face_vhandles.push_back(vhandle[k- i]);face_vhandles.push_back(vhandle[k - (i + 1) % n]);face_vhandles.push_back(vhandle[k + 1]);mesh.add_face(face_vhandles);}try{if (!OpenMesh::IO::write_mesh(mesh, "output5 .off")) {std::cerr << "Cannot write mesh to file ' output5 .off ' " << std::endl;return 1;}}catch (std::exception&x) {std::cerr << x.what() << std::endl;return 1;}return 0;
}