Obj模型文件读取文件

#include <GL/glut.h> #include <stdio.h> #include <iostream> #include<string> #include<fstream> #include<sstream> using namespace std; int v_num=0; //记录点的数量 int f_num=0; //记录面的数量 int vn_num=0; GLfloat **vArr; //存放点的二维数组 int **fvArr; //存放面顶点的二维数组 int **fnArr; GLfloat **vnArr; string s1,s2,s3,s4; GLfloat f2,f3,f4; void getLineNum(string addrstr) //获取点和面的数量 { ifstream infile(addrstr.c_str()); //打开指定文件 string sline;//每一行 int i=0,j=0; while(getline(infile,sline)) //从指定文件逐行读取 { if(sline[0]=='v') { if(sline[1]=='n') vn_num++; else v_num++; } if(sline[0]=='f') { f_num++; } } } int readfile(string addrstr) //将文件内容读到数组中去 { //getLineNum(addrstr); //new二维数组 vArr=new GLfloat*[v_num]; for (int i=0;i<v_num;i++) { vArr[i]=new GLfloat[3]; } vnArr=new GLfloat*[vn_num]; for (i=0;i<vn_num;i++) { vnArr[i]=new GLfloat[3]; } fvArr=new int*[f_num]; fnArr=new int*[f_num]; for (i=0;i<f_num;i++) { fvArr[i]=new int[3]; fnArr[i]=new int[3]; } ifstream infile(addrstr.c_str()); string sline;//每一行 int ii=0,jj=0,kk=0; while(getline(infile,sline)) { if(sline[0]=='v') { if(sline[1]=='n')//vn { istringstream sin(sline); sin>>s1>>f2>>f3>>f4; vnArr[ii][0]=f2; vnArr[ii][1]=f3; vnArr[ii][2]=f4; ii++; } else//v { istringstream sin(sline); sin>>s1>>f2>>f3>>f4; vArr[jj][0]=f2; vArr[jj][1]=f3; vArr[jj][2]=f4; jj++; } } if (sline[0]=='f') //存储面 { istringstream in(sline); GLfloat a; in>>s1;//去掉f int i,k; for(i=0;i<3;i++) { in>>s1; cout<<s1<<endl; //取出第一个顶点和法线索引 a=0; for(k=0;s1[k]!='/';k++) { a=a*10+(s1[k]-48); } fvArr[kk][i]=a; a=0; for(k=k+2;s1[k];k++) { a=a*10+(s1[k]-48);; } fnArr[kk][i]=a; } kk++; } } return 0; } void init(void) { getLineNum("wan.obj"); readfile("wan.obj"); GLfloat mat_specular[] = {1.0, 1.0, 1.0, 1.0}; GLfloat mat_shininess[] = {50.0}; GLfloat light_position[] = {1.0, 1.0f, 1.0, 0.0}; GLfloat white_light[] = {1.0, 1.0, 1.0, 1.0}; GLfloat lmodel_ambient[] = {0.1, 0.1, 0.1, 1.0}; glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_SMOOTH); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_DIFFUSE, white_light); glLightfv(GL_LIGHT0, GL_SPECULAR, white_light); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); /* glShadeModel(GL_SMOOTH); // Enable Smooth Shading glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background glClearDepth(1.0f); // Depth Buffer Setup glEnable(GL_DEPTH_TEST); // Enables Depth Testing glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculation */ } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glTranslatef(1.0,-0.0,-8.0); glScalef(0.1,0.1,0.1); for (int i=0;i<f_num;i++) { // glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glBegin(GL_TRIANGLES); glNormal3f(vnArr[fnArr[i][0]-1][0], vnArr[fnArr[i][0]-1][1], vnArr[fnArr[i][0]-1][2]); glVertex3f(vArr[fvArr[i][0]-1][0], vArr[fvArr[i][0]-1][1], vArr[fvArr[i][0]-1][2]); glNormal3f(vnArr[fnArr[i][1]-1][0], vnArr[fnArr[i][1]-1][1], vnArr[fnArr[i][1]-1][2]); glVertex3f(vArr[fvArr[i][1]-1][0], vArr[fvArr[i][1]-1][1], vArr[fvArr[i][1]-1][2]); glNormal3f(vnArr[fnArr[i][2]-1][0], vnArr[fnArr[i][2]-1][1], vnArr[fnArr[i][2]-1][2]); glVertex3f(vArr[fvArr[i][2]-1][0], vArr[fvArr[i][2]-1][1], vArr[fvArr[i][2]-1][2]); glEnd(); } glFlush(); } void reshape(int w, int h) { glViewport(0, 0, (GLsizei)w, (GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if (w <= h) glOrtho(-1.5, 1.5, -1.5 * (GLfloat)h/(GLfloat)w, 1.5 * (GLfloat)h/(GLfloat)w, -10.0, 10.0); else glOrtho(-1.5*(GLfloat)w/(GLfloat)h, 1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(500, 500); glutInitWindowPosition(100, 100); glutCreateWindow(argv[0]); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; }