OpenGL 구에 조명주기

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#include <windows.h>           #include <iostream.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <gl/glut.h>   #include <math.h>   #define PI  3.1415926 #define No_theta    36 #define No_phi      18     float   theta, phi; float   delta_theta, delta_phi; float   start_theta, start_phi;   float   R_Position[] = { 3.0f, 0.0f, 5.0f, 1.0f}; float   R_Diffuse[] = { 1.0f, 0.2f, 0.5f, 1.0f}; float   R_Specular[] = { 1.0f, 1.0f, 1.0f, 1.0f};   float   Position[] = { 3.0f, 3.0f, 3.0f, 1.0f }; float   Diffuse[] =  { 1.0f, 0.0f, 0.0f, 1.0f }; float   Specular[] = { 1.0f, 0.0f, 0.0f, 1.0f };   float   light0_position[] = {5.0, -2.0, 2.0, 1.0}; float   light0_ambient[] = {1.0, 1.0, 1.0, 1.0}; float   light0_diffuse[] = {1.0, 1.0, 1.0, 1.0}; float   light0_specular[] = {1.0, 1.0, 1.0, 1.0};   float   material0_specular[] = {1.0, 1.0, 1.0, 1.0}; float   material0_diffuse[] = {1.0, 0.0, 0.0, 1.0};     float   Radius;   struct  vector3d{     float       x;     float       y;     float       z; };   struct point3d{     float       x;     float       y;     float       z;     vector3d    normal; };   point3d ver[No_theta][No_phi];       void    Vertex_Generation(void) {       start_theta = 0.0;     delta_theta = 2* PI/ No_theta;       start_phi = -PI/2.0;     delta_phi = PI / (No_phi-1);           for (  int j = 0; j < No_phi; j++ ) {         for ( int i = 0; i < No_theta; i++) {             theta = start_theta + i * delta_theta;             phi = start_phi + j * delta_phi;             ver[i][j].x = Radius *  cos(phi) * cos(theta);             ver[i][j].y = Radius *  cos(phi) * sin(theta);             ver[i][j].z = Radius *  sin(phi);         }     } }   void init (void) {     glClearColor (0.0, 0.0, 0.0, 0.0) ;          glShadeModel(GL_SMOOTH); //  glShadeModel(GL_FLAT);       glEnable(GL_DEPTH_TEST);     glEnable(GL_LIGHTING);     glEnable(GL_LIGHT0);       glLightfv(GL_LIGHT0, GL_POSITION, light0_position);     glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);     glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);     glLightfv(GL_LIGHT0, GL_SPECULAR, light0_specular);       glMaterialfv(GL_FRONT, GL_SPECULAR, material0_specular);     glMaterialfv(GL_FRONT, GL_DIFFUSE, material0_diffuse);     glMaterialf(GL_FRONT, GL_SHININESS, 100);         Radius = 1.0;     Vertex_Generation();   }     void Draw_Sphere(void) {     for ( int j = 0; j < No_phi -1; j++ ) {         for (int i = 0; i < No_theta; i++) {             glBegin(GL_POLYGON);                    glNormal3f(ver[i][j].x, ver[i][j].y, ver[i][j].z);                 glVertex3f(ver[i][j].x, ver[i][j].y, ver[i][j].z);                 glNormal3f(ver[(i+1)%No_theta][j].x, ver[(i+1)%No_theta][j].y, ver[(i+1)%No_theta][j].z);                 glVertex3f(ver[(i+1)%No_theta][j].x, ver[(i+1)%No_theta][j].y, ver[(i+1)%No_theta][j].z);                 glNormal3f(ver[(i+1)%No_theta][j+1].x, ver[(i+1)%No_theta][j+1].y, ver[(i+1)%No_theta][j+1].z);                 glVertex3f(ver[(i+1)%No_theta][j+1].x, ver[(i+1)%No_theta][j+1].y, ver[(i+1)%No_theta][j+1].z);                 glNormal3f(ver[i][j+1].x, ver[i][j+1].y, ver[i][j+1].z);                 glVertex3f(ver[i][j+1].x, ver[i][j+1].y, ver[i][j+1].z);             glEnd();         }     } }         void reshape (int w, int h) {     glViewport(0, 0, w, h);     glMatrixMode (GL_PROJECTION);      glLoadIdentity();     gluPerspective(45.0, 1.0, 1.0, 1000);       gluLookAt(2.0 * Radius, 2.0 * Radius, 2.0 * Radius, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);     glMatrixMode (GL_MODELVIEW);      glLoadIdentity();   }   void display (void) {       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);             Draw_Sphere();             glFlush ();     glutSwapBuffers(); }     void main (int argc, char** argv) {     glutInit (&argc, argv);        glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);      glutInitWindowPosition (100, 100);        glutInitWindowSize (500, 500);       glutCreateWindow ("Generated Sphere");      glutDisplayFunc (display);       glutReshapeFunc (reshape);      glutIdleFunc(display);     init();        glutMainLoop();    }