OpenGl 구 표현하기 (카메라 추가)

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#include <gl/glut.h>      #include <stdio.h>   #include <math.h>   #include <iostream> using namespace std;     #define PI  3.1415926  #define M 36 #define N 18     float radius = 1;  float theta;  float phi; float delta_theta; float delta_phi;     struct Point3D {     float x;     float y;     float z; };     Point3D vertex[M][N+1];     float cameraX = 3; float cameraY = 3; float cameraZ = 3;     void init (void)   {       glClearColor (0.0, 0.0, 0.0, 0.0) ;           glColor3f(1.0, 1.0, 0.0);       glEnable(GL_DEPTH_TEST);    // 깊이 활성화   }       void reshape (int w, int h)   {       glViewport(0, 0, w, h);       glMatrixMode (GL_PROJECTION);         glLoadIdentity();       //glOrtho (-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);       gluPerspective(60.0, 1.0, 1.0, 100.0); // 멀고 가까움을 표현함 }       void display (void)   {               glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);       glMatrixMode (GL_MODELVIEW);           glLoadIdentity();       gluLookAt(cameraX, cameraY, cameraZ, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);               glBegin(GL_LINES);  // X, Y, Z 선 표시       glColor3f(1.0, 0.0, 0.0); // X축        glVertex3f(0.0, 0.0, 0.0);       glVertex3f(10.0, 0.0, 0.0);               glColor3f(0.0, 1.0, 0.0); // Y축        glVertex3f(0.0, 0.0, 0.0);       glVertex3f(0.0, 10.0, 0.0);               glColor3f(0.0, 0.0, 1.0); // Z축        glVertex3f(0.0, 0.0, 0.0);       glVertex3f(0.0, 0.0, 10.0);       glEnd();               delta_theta = 2 * PI / M;     delta_phi = PI / N;         int i = 0, j = 0;         for(j = 0; j <= N; j++)     {         for(i = 0; i < M; i++)         {             theta = i * delta_theta;             phi = j * delta_phi - ( PI / 2.0 );             vertex[i][j].x = radius * cos(theta) * cos(phi);             vertex[i][j].y = radius * sin(theta) * cos(phi);             vertex[i][j].z = radius * sin(phi);         }     }         for(j = 0; j < N; j++)     {         for(i = 0; i < M; i++)         {             theta = i * delta_theta;             phi = j * delta_phi - ( PI / 2 );             glColor3f(0.0, 1.0, 1.0);             glBegin(GL_POLYGON);             glVertex3f(vertex[i][j].x, vertex[i][j].y, vertex[i][j].z);             glVertex3f(vertex[(i+1)%M][j].x, vertex[(i+1)%M][j].y, vertex[(i+1)%M][j].z);             glVertex3f(vertex[(i+1)%M][j+1].x, vertex[(i+1)%M][j+1].y, vertex[(i+1)%M][j+1].z);             glVertex3f(vertex[i][j+1].x, vertex[i][j+1].y, vertex[i][j+1].z);             glEnd();         }     }         glFlush ();        glutSwapBuffers();   }     void key(unsigned char key, int x, int y) {     switch(key)     {     case 27:         exit(0);         break;     } }   void specialKey(int key, int x, int y) {     switch(key)     {     case GLUT_KEY_LEFT:         cameraX -= 1;         break;     case GLUT_KEY_RIGHT:         cameraX += 1;         break;     case GLUT_KEY_UP:         cameraY += 1;         break;     case GLUT_KEY_DOWN:         cameraY -= 1;         break;     }     //glutPostRedisplay();       }    void main (int argc, char** argv)   {     glutInit (&argc, argv);        glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );      glutInitWindowPosition (100, 100);        glutInitWindowSize (500, 500);       glutCreateWindow ("Cube");      init();     glutDisplayFunc (display);       glutReshapeFunc (reshape);      glutKeyboardFunc(key);     glutSpecialFunc(specialKey);     glutIdleFunc(display);     glutMainLoop();   }