其中GL_FRONT for front-facing polygons, GL_BACK for back-facing polygons, or GL_FRONT_AND_BACK for front- and back-facing polygons

mode有GL_POINT, GL_LINE, and GL_FILL三种，其中初始状态是GL_FILL，正反两面都是

#include<GL/GLUT.H>
#include <windows.h>
#include <math.h>
#include <gl/GL.h>       static const GLfloat vertex_list[2][8][3] = {{{ -0.1f, 0.5f, 0.3f }, { -0.1f, 0, 0.3f }, { -0.6f, 0, 0.3f }, { -0.6f, -0.5f, 0.3f }, { 0.6f, -0.5f, 0.3f }, { 0.6f, 0, 0.3f }, { 0.1f, 0, 0.3f }, { 0.1f, 0.5f, 0.3f } },{ { -0.1f, 0.5f, -0.3f }, { -0.1f, 0, -0.3f }, { -0.6f, 0, -0.3f }, { -0.6f, -0.5f, -0.3f }, { 0.6f, -0.5f, -0.3f }, { 0.6f, 0, -0.3f }, { 0.1f, 0, -0.3f }, { 0.1f, 0.5f, -0.3f } }
};void myDisplay(void) {glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glEnable(GL_DEPTH_TEST);glRotatef(60, 1, 1, 1);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(100.0f, 1.0f, 1.0f, 10.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0.0, -0.8, 1.5, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);/*glRotatef(-60, -1, 1, 1);*/glColor3f(0, 0, 1);glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);glBegin(GL_POLYGON);for (int j = 0; j < 8; ++j)     // 每个面有八个顶点，循环八次    glVertex3fv(vertex_list[0][j]);glEnd();glBegin(GL_POLYGON);for (int j = 0; j < 8; ++j)     // 每个面有八个顶点，循环八次    glVertex3fv(vertex_list[1][j]);glEnd();//绘制侧面的面glColor3f(0, 0, 1);for (int i = 0; i < 8; i++)      // 有八个面，循环八次    {if (i == 7){glBegin(GL_QUADS);glVertex3fv(vertex_list[0][i]);glVertex3fv(vertex_list[0][0]);glVertex3fv(vertex_list[1][0]);glVertex3fv(vertex_list[1][i]);glEnd();}else{glBegin(GL_QUADS);glVertex3fv(vertex_list[0][i]);glVertex3fv(vertex_list[0][i + 1]);glVertex3fv(vertex_list[1][i + 1]);glVertex3fv(vertex_list[1][i]);glEnd();}}glFlush();
}int main(int argc, char *argv[])
{glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutInitWindowPosition(100, 100);glutInitWindowSize(400, 400);glutCreateWindow("opengl1");glutDisplayFunc(&myDisplay);glutMainLoop();return 0;
}

学到这里突然要发现需要学习好多数据结构的东西。。我觉得有必要专门写一篇关于数据结构和图形表示的博客。。那这一块的东西还是暂时放一放。马上搞定了回来补

#include<GL/GLUT.H>
#include <windows.h>
#include <math.h>
#include <gl/GL.h>       static const GLfloat vertex_list[2][8][3] = {{{ -0.1f, 0.5f, 0.3f }, { -0.1f, 0, 0.3f }, { -0.6f, 0, 0.3f }, { -0.6f, -0.5f, 0.3f }, { 0.6f, -0.5f, 0.3f }, { 0.6f, 0, 0.3f }, { 0.1f, 0, 0.3f }, { 0.1f, 0.5f, 0.3f } },{ { -0.1f, 0.5f, -0.3f }, { -0.1f, 0, -0.3f }, { -0.6f, 0, -0.3f }, { -0.6f, -0.5f, -0.3f }, { 0.6f, -0.5f, -0.3f }, { 0.6f, 0, -0.3f }, { 0.1f, 0, -0.3f }, { 0.1f, 0.5f, -0.3f } }
};void myDisplay(void) {glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glEnable(GL_DEPTH_TEST);glRotatef(60, 1, 1, 1);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(100.0f, 1.0f, 1.0f, 10.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0.0, -0.8, 1.5, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);/*glRotatef(-60, -1, 1, 1);*/glColor3f(0, 0, 1);glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);glBegin(GL_POLYGON);for (int j = 0; j < 8; ++j)     // 每个面有八个顶点，循环八次    glVertex3fv(vertex_list[0][j]);glEnd();glBegin(GL_POLYGON);for (int j = 0; j < 8; ++j)     // 每个面有八个顶点，循环八次    glVertex3fv(vertex_list[1][j]);glEnd();//绘制侧面的面glColor3f(0, 0, 1);for (int i = 0; i < 8; i++)      // 有八个面，循环八次    {if (i == 7){glBegin(GL_QUADS);glVertex3fv(vertex_list[0][i]);glVertex3fv(vertex_list[0][0]);glVertex3fv(vertex_list[1][0]);glVertex3fv(vertex_list[1][i]);glEnd();}else{glBegin(GL_QUADS);glVertex3fv(vertex_list[0][i]);glVertex3fv(vertex_list[0][i + 1]);glVertex3fv(vertex_list[1][i + 1]);glVertex3fv(vertex_list[1][i]);glEnd();}}glFlush();
}int main(int argc, char *argv[])
{glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutInitWindowPosition(100, 100);glutInitWindowSize(400, 400);glutCreateWindow("opengl1");glutDisplayFunc(&myDisplay);glutMainLoop();return 0;
}

这篇博文没有写完。。突然发现要去补数据结构的课。。，好了不多说了，去补课了