OPENGL读取obj模型_visual stdio2015

#include"model.h" #include<time.h> //构造函数 Objmodel::Objmodel() { v_num = 0; vt_num = 0; vn_num = 0; f_num = 0; value = false; } Objmodel::~Objmodel() { v_num = 0; vt_num = 0; vn_num = 0; f_num = 0; vertex.clear(); vertex_texture.clear(); vertex_normal.clear(); face_vertex.clear(); face_normal.clear(); face_texture.clear(); face_normal.clear(); } //读取模型数据的相关操作 根据str中 KEY的数量来判断str中存储数据格式 int findKey(string str, char key) { int value = 0; for (int i = 0; i < str.length(); i++) if (str[i] == key) value++; return value; } //读取模型数据的相关操作 读取f中 的索引信息 void getNum(string str, vector<int > &fv, vector<int > &fo) { int num = 0; int det = 0; vector<int >ff(6); for (int i = 0; str[i] != '\0' && det<6; i++) { if (str[i] >= '0' && str[i] <= '9') num = num * 10 + str[i] - '0'; else { if (num != 0) { ff[det] = num; det++; num = 0; } } } fv[0] = ff[0]; fv[1] = ff[2]; fv[2] = ff[4]; fo[0] = ff[1]; fo[1] = ff[3]; fo[2] = ff[5]; } //读取模型数据的相关操作 读取f中 的索引信息 重载函数 void getNum(string str, vector<int > &fv, vector<int > &ft, vector<int > &fn) { int num = 0; int det = 0; vector<int >ff(9); for (int i = 0; str[i] != '/0'&& det < 9; i++) { if (str[i] >= '0' && str[i] <= '9') num = num * 10 + str[i] - '0'; else { if (num != 0) { ff[det] = num; det++; num = 0; } } } fv[0] = ff[0]; fv[1] = ff[3]; fv[2] = ff[6]; ft[0] = ff[1]; ft[1] = ff[4]; ft[2] = ff[7]; fn[0] = ff[2]; fn[1] = ff[5]; fn[2] = ff[8]; } vector<GLfloat > vectorCross(vector<GLfloat > v1, vector<GLfloat > v2) { vector<GLfloat > result(3); result[0] = v1[1] * v2[2] - v1[2] * v2[1]; result[1] = v1[2] * v2[0] - v1[0] * v2[2]; result[2] = v1[0] * v2[1] - v1[1] * v2[1]; return result; } //计算法向 void Objmodel::calculateNormal() { value = true; vector< vector<GLfloat>>rawNormal(v_num); for (int i = 0; i < v_num; i++) rawNormal[i].resize(3); vector<GLfloat >v1(3); vector<GLfloat >v2(3); vector<GLfloat >f_norm1(3); vector<GLfloat >f_norm2(3); vector<GLfloat >f_norm3(3); for (int i = 0; i < f_num; i++) { for (int j = 0; j < 3; j++) { v1[j] = vertex[face_vertex[i][1]-1][j] - vertex[face_vertex[i][0]-1][j]; v2[j] = vertex[face_vertex[i][2]-1][j] - vertex[face_vertex[i][1]-1][j]; } //叉乘1 f_norm1 = vectorCross(v1, v2); v1 = v2; for (int j = 0; j < 3; j++) { v2[j] = vertex[face_vertex[i][0] - 1][j] - vertex[face_vertex[i][2] - 1][j]; } //叉乘2 f_norm2 = vectorCross(v1, v2); v1 = v2; for (int j = 0; j < 3; j++) { v2[j] = vertex[face_vertex[i][1] - 1][j] - vertex[face_vertex[i][0] - 1][j]; } //叉乘3 f_norm3 = vectorCross(v1, v2); for (int i = 0; i < 3; i++) { //根据三个点算出三个法向，平均之后作为每个点的法向 f_norm1[0] = (f_norm1[0] + f_norm2[0] + f_norm3[0]) / 3.0f; f_norm1[1] = (f_norm1[1] + f_norm2[1] + f_norm3[1]) / 3.0f; f_norm1[2] = (f_norm1[2] + f_norm2[2] + f_norm3[2]) / 3.0f; } for (int j = 0; j < 3; j++) { rawNormal[face_vertex[i][j] - 1] = f_norm1; } //face_normal = face_vertex; //rawNormal[face_vertex[i][0] - 1] = f_norm3; //根据三个点算出三个向量，分别作为每个点的法向 //rawNormal[face_vertex[i][1] - 1] = f_norm1; //rawNormal[face_vertex[i][2] - 1] = f_norm2; //face_normal = face_vertex; } vertex_normal = rawNormal; } //读取模型数据 void Objmodel:: readFile(string path) { string str; string message; ifstream infile; infile.open(path.c_str(), ios::in); //以输入的方式打开文件 if (!infile.is_open()) { cout << "无法打开文件" << endl; infile.close(); return; } while (!infile.eof()) { getline(infile, message); //按顺序读取文件中的每行数据 //cout << message << endl; //测试读入数据 vector<GLfloat> a(3); /*a1 = { 1,2,3 }; vertex.push_back(a1); cout << vertex[0][0] << vertex[0][1] << vertex[0][2];*/ if(message[0] == '#') //第一个字幕以‘#’开头代表注释 continue; else if (message[0] == 'v') { //顶点数据 if (message[1] == 't') { //贴图坐标点 istringstream sin(message); sin >> str >> a[0] >> a[1] >> a[2]; vertex_texture.push_back(a); //压入贴图数组 vt_num++; } else if (message[1] == 'n') { //法线信息 istringstream sin(message); sin >> str >> a[0] >> a[1] >> a[2]; vertex_normal.push_back(a); //压入法线数组 vn_num++; } else if(message[1] == ' '){ istringstream sin(message); sin >> str >> a[0] >> a[1] >> a[2]; vertex.push_back(a); //压入顶点数组 v_num++; } } else if (message[0] == 'f') { vector<int > fv(3); vector<int > fvn(3); vector<int > fvt(3); istringstream sin(message); if (findKey(message,'/') == 6) { // 格式为V1/VT1/VN1 V2/VT2/VN2 V3/VT3/VN3 getNum(message, fv, fvt,fvn); face_vertex.push_back(fv); face_texture.push_back(fvt); face_normal.push_back(fvn); } else if (findKey(message, '/') == 3) { //格式为 V1/T1 V2/T2 V3/T3 sin >> str; //f getNum(message,fv, fvt); face_vertex.push_back(fv); face_texture.push_back(fvt); } else if (findKey(message, '/') == 0) { //格式为 V1 V2 V3 sin >> str; //f sin >> fv[0] >> fv[1] >> fv[2]; face_vertex.push_back(fv); } else if (findKey(message, '//') == 3) { //格式为 V1//N1 V2//N2 V3//N3 getNum(message, fv, fvn); face_vertex.push_back(fv); face_normal.push_back(fvn); } f_num++; } } if (vertex_normal.size() == 0) calculateNormal(); //计算法向 infile.close(); } //显示模型数据 void Objmodel::showObj(GLint mode1,GLint mode2) { glPolygonMode(GL_FRONT_AND_BACK, mode1); glBegin(mode2); for (int i = 0; i < f_num; i++) //目前不用法向，不加光照，只是为了把读入的模型显示一下 { //glNormal3f(vertex_normal[face_normal[i][0] - 1][0], vertex_normal[face_normal[i][0] - 1][1], vertex_normal[face_normal[i][0] - 1][2]); if(value) glNormal3f(vertex_normal[face_vertex[i][0] - 1][0], vertex_normal[face_vertex[i][0] - 1][1], vertex_normal[face_vertex[i][0] - 1][2]); else glNormal3f(vertex_normal[face_normal[i][0] - 1][0], vertex_normal[face_normal[i][0] - 1][1], vertex_normal[face_normal[i][0] - 1][2]); glVertex3f(vertex[face_vertex[i][0] - 1][0], vertex[face_vertex[i][0] - 1][1], vertex[face_vertex[i][0] - 1][2]); if (value) glNormal3f(vertex_normal[face_vertex[i][1] - 1][0], vertex_normal[face_vertex[i][1] - 1][1], vertex_normal[face_vertex[i][1] - 1][2]); else glNormal3f(vertex_normal[face_normal[i][1] - 1][0], vertex_normal[face_normal[i][1] - 1][1], vertex_normal[face_normal[i][1] - 1][2]); glVertex3f(vertex[face_vertex[i][1] - 1][0], vertex[face_vertex[i][1] - 1][1], vertex[face_vertex[i][1] - 1][2]); if(value) glNormal3f(vertex_normal[face_vertex[i][2] - 1][0], vertex_normal[face_vertex[i][2] - 1][1], vertex_normal[face_vertex[i][2] - 1][2]); else glNormal3f(vertex_normal[face_normal[i][2] - 1][0], vertex_normal[face_normal[i][2] - 1][1], vertex_normal[face_normal[i][2] - 1][2]); glVertex3f(vertex[face_vertex[i][2] - 1][0], vertex[face_vertex[i][2] - 1][1], vertex[face_vertex[i][2] - 1][2]); } glEnd(); } //排序 //随机快速排序 void Swap(float *a, int i, int j) { float temp = a[i]; a[i] = a[j]; a[j] = temp; } int qsort(float *a, int begin, int end) { int i, j, temp; i = begin - 1; j = begin; for (; j < end; j++) { if (a[j] <= a[end - 1]) Swap(a, ++i, j); } return i; } void randqsort(float *a, int begin, int n) { while (begin >= n) return; srand((unsigned)time(NULL)); int key = (begin + rand() % (n - begin)); Swap(a, key, n - 1); int m = qsort(a, begin, n); randqsort(a, begin, m); randqsort(a, m + 1, n); } //计算obj包围盒中心 并将中心平移到原点 vector<GLfloat> Objmodel::getCenter(/*GLfloat &x,GLflo