通过VC++和OpenGL显示STL文件

老师给留了作业，通过OpenGL将STL文件显示出来。自己初步学习了OpenGL的知识，又学了一些VC++知识，参考了一些资料，最后写出来了。

#include<iostream>#include<vector>#include<fstream>#include<string>#include<sstream>#include<cmath>#include<stdio.h>#include<GLTools.h>#include<GL/glut.h>using namespace std;int nums = 0;float* facets;//use the float onlyfloat* vectors;int angle = 0;int xyz[3] = { 0,0,0 };//lightGLfloat lightAmb[] = { 0.f,0.f,0.f,1.f };GLfloat lightDiff[] = { 1.f,1.f,1.f,1.f };GLfloat lightSpec[] = { 1.f,1.f,1.f,1.f };GLfloat lightPos[] = { 1.f,1.f,1.f,0.f };//materialGLfloat goldAmb[] = { 0.24725f,0.1995f,0.0745f,1.f };GLfloat goldDiff[] = { 0.75164f,0.60648f,0.22648f,1.f };GLfloat goldSpec[] = { 0.628281f,0.555802f,0.366065f,1.f };GLfloat goldShin = 51.2f;void  dataGet() {    int amountFacet = 0, amountVectors = 0;    long size = 0;    int nlines = 0;    FILE* file;    errno_t err;    err = fopen_s(&file, "D:\\downloads\\Stanford_Bunny\\Stanford_Bunny\\bunny.stl", "r");    fseek(file, 0L, SEEK_END);    size = ftell(file);    fclose(file);    err = fopen_s(&file, "D:\\downloads\\Stanford_Bunny\\Stanford_Bunny\\bunny.stl", "r");    //读取Standford Bunny的STL文件    for (int i = 0; i < size; i++) {//get the amount of lines        if (getc(file) == '\n') {            nlines++;        }    }    nums = nlines / 7;//get the amount of triangles    amountFacet = 3 * nums;    amountVectors = 9 * nums;    facets = new float[3 * nums];    vectors = new float[9 * nums];    rewind(file);    while (getc(file) != '\n');    for (int i = 0, j = 0; i < nlines; i++, j++) {    //获取各个三角面的顶点值和法向量值        double x = 0.0, y = 0.0, z = 0.0;        int re = 0;        re = fscanf_s(file, "%*s %*s %lf %lf %lf\n", &x, &y, &z);        if (re == 3) {            facets[i] = x;            i++;            facets[i] = y;            i++;            facets[i] = z;        }//the facet's data        fscanf_s(file, "%*s %*s");        re = fscanf_s(file, "%*s %lf %lf %lf", &x, &y, &z);        if (re == 3) {            vectors[j] = x;            j++;            vectors[j] = y;            j++;            vectors[j] = z;            j++;        }//the first vector        re = fscanf_s(file, "%*s %lf %lf %lf", &x, &y, &z);        if (re == 3) {            vectors[j] = x;            j++;            vectors[j] = y;            j++;            vectors[j] = z;            j++;        }//the second vector        re = fscanf_s(file, "%*s %lf %lf %lf", &x, &y, &z);        if (re == 3) {            vectors[j] = x;            j++;            vectors[j] = y;            j++;            vectors[j] = z;        }//the third vector        fscanf_s(file, "%*s");        fscanf_s(file, "%*s");    }}void drawTriangle() {//绘制三角形    for (int x = 1; x <= nums; x++) {        int i = 3 * (x - 1);        int j = 9 * (x - 1);        glBegin(GL_TRIANGLES);        glVertex3d(vectors[j], vectors[j + 1], vectors[j + 2]);        j = j + 3;        glVertex3d(vectors[j], vectors[j + 1], vectors[j + 2]);        j = j + 3;        glVertex3d(vectors[j], vectors[j + 1], vectors[j + 2]);        glEnd();    }}void reshape(int w, int h) {    glViewport(0.0, 0.0, w, h);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluPerspective(350000000000000000000000000.0, (double)w / h, 5.0, 2000000000000000000.0);//显示视角不知道如何控制比价好，一点点调出这个值    glMatrixMode(GL_MODELVIEW);}void idle() {    glutPostRedisplay();}void myDisplay(){    static int angle = 0;    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    glClearColor(1.0, 1.0, 1.0, 0.0);//background color    glLoadIdentity();    gluLookAt(0.0, -160.0, 0.0, 10.0, 50.0, 0.0, 0.0, 0.0, -1.0);    glLightfv(GL_LIGHT0,GL_POSITION,lightPos);    glPushMatrix();    glRotatef(float(angle), 0.f, 0.f, 1.f);    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, goldAmb);    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, goldDiff);    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, goldSpec);    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, goldShin);    drawTriangle();    glPopMatrix();      glutSwapBuffers();    if (++angle >= 360) {        angle = 0;    }//图像进行旋转}void init() {    glClearColor(1.f, 1.f, 1.f, 1.f);    glClearDepth(1.f);    glEnable(GL_DEPTH_TEST);    glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmb);    glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiff);    glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpec);    glEnable(GL_LIGHT0);    glEnable(GL_LIGHTING);}void main(int argc, char* argv[]) {    dataGet();    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);    //glutInitDisplayMode(GLUT_RGBA );    glutInitWindowPosition(100, 100);    glutInitWindowSize(400, 400);    glutCreateWindow("test");    init();    glutDisplayFunc(myDisplay);    glutReshapeFunc(reshape);    glutIdleFunc(idle);    glutMainLoop();    system("pause");}

参考文章链接:
读取STL模型，并用opengl显示出来
基于 VC++和 OpenGL 的 STL 文件读取显示