使用openGL繪製正方立體空盒

【程式碼】

#include <stdlib.h>
//#include "GL/glut.h"
#include <GL/glut.h>
#include <iostream>

using namespace std;

void Cube_ex(int argc, char *argv[]);
void init();
void SetLight();
void display();

//光源
void SetLight(){
    GLfloat light_ambient[] = { 0.5f, 0.5f, 1.0f, 1.0f };
    GLfloat light_diffuse[] = { 0.5f, 0.5f, 0.9f, 1.0f };
    GLfloat light_specular[] = { 0.5f, 0.5f, 0.9f, 1.0f };
    GLfloat light0_position[] = { -100.0, 100.0, 100.0, 1.0 };
    GLfloat spot0_direction[] = { 0.0, -1.0, 0.0 };
    GLfloat light1_position[] = { 10.0, -10.0, -10.0, -1.0 };
    GLfloat spot1_direction[] = { 0.0, 1.0, 0.0 };

    //Light0
    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
    glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spot0_direction);

    //Light1
    glLightfv(GL_LIGHT1, GL_AMBIENT, light_ambient);
    glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
    glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT1, GL_POSITION, light1_position);
    glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, spot1_direction);

    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHT1);
}

//繪圖
void display(){

    //輸入頂點立方體的坐標
    //立方體每一面邊長為1.0f的長度
    //原點為0.0

    //總共有A~H八個頂點
    static GLfloat vert[8][3] =
    {
        { -1, -1, 1 }, //A
        { 1, -1, 1 }, //B
        { 1, 1, 1 }, //C
        { -1, 1, 1 }, //D
        { 1, -1, -1 }, //E
        { -1, -1, -1 }, //F
        { -1, 1, -1 }, //G
        { 1, 1, -1 }  //H
    };

    glEnable(GL_LIGHTING);
    SetLight();

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    gluPerspective(30.0, 1.0, 1.0, 100.0);
    gluLookAt(3.0, 4.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
    glEnable(GL_DEPTH_TEST);
    glDisable(GL_DEPTH_TEST);

    glColor3d(0.0, 1.0, 0.0);
    glBegin(GL_LINE_LOOP);

    //下表面的頂點的指定
        glVertex3fv(vert[1]);
        glVertex3fv(vert[0]);
        glVertex3fv(vert[5]);
        glVertex3fv(vert[4]);
    glEnd();

    //上表面的頂點的指定
    glBegin(GL_LINE_LOOP);
        glVertex3fv(vert[3]);
        glVertex3fv(vert[2]);
        glVertex3fv(vert[7]);
        glVertex3fv(vert[6]);
    glEnd();

    //背面的頂點的指定
    glBegin(GL_LINE_LOOP);
        glVertex3fv(vert[4]);
        glVertex3fv(vert[5]);
        glVertex3fv(vert[6]);
        glVertex3fv(vert[7]);
    glEnd();

    //前表面的頂點指定
    glBegin(GL_LINE_LOOP);
        glVertex3fv(vert[0]);
        glVertex3fv(vert[1]);
        glVertex3fv(vert[2]);
        glVertex3fv(vert[3]);
    glEnd();

    //畫線
    glFlush();
}

void Cube_ex(int argc, char *argv[]){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA);
    glutInitWindowSize(512, 512);
    glutCreateWindow("graphic");
    glutDisplayFunc(display);
    init();
    glutMainLoop();
}

void init(){
    glClearColor(0.0, 0.0, 0.0, 0.0);
}

int main(int argc, char *argv[]){
    Cube_ex(argc, argv);
}