Lumières colorées et lumières blanches sur cubes sans normales
Lumières colorées et lumières blanches sur cubes sans normales
Lumières colorées et lumières blanches sur cubes avec normales
Cylindres par facette
Cylindre par facette (peu de facettes)
Le source : EnsembleFacettesCubeCylindre.cpp
/* Cubes et cylindre modelises par facettes */
/* */
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2010 */
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
/* Variables et constantes globales */
/* pour les angles et les couleurs utilises */
#ifndef M_PI
#define M_PI 3.14159
#endif
static int obj = 0;
static float rx = 0.0F;
static float ry = 0.0F;
static float rz = 0.0F;
static const float noir[] = { 0.0F,0.0F,0.0F,1.0F };
static const float blanc[] = { 1.0F,1.0F,1.0F,1.0F };
static const float gris[] = { 0.7F,0.7F,0.7F,1.0F };
static const float jaune[] = { 1.0F,1.0F,0.0F,1.0F };
static const float rouge[] = { 1.0F,0.0F,0.0F,1.0F };
static const float vert[] = { 0.0F,1.0F,0.0F,1.0F };
static const float bleu[] = { 0.0F,0.0F,1.0F,1.0F };
static int n = 36;
static int m = 36;
/* Fonction d'initialisation des parametres */
/* OpenGL ne changeant pas au cours de la vie */
/* du programme */
void init(void) {
const GLfloat shininess[] = { 50.0 };
glMaterialfv(GL_FRONT,GL_AMBIENT,noir);
glMaterialfv(GL_FRONT,GL_DIFFUSE,blanc);
glMaterialfv(GL_FRONT,GL_SPECULAR,blanc);
glMaterialfv(GL_FRONT,GL_SHININESS,shininess);
glLightfv(GL_LIGHT0,GL_DIFFUSE,rouge);
glLightfv(GL_LIGHT1,GL_DIFFUSE,jaune);
glLightfv(GL_LIGHT2,GL_DIFFUSE,bleu);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHT2);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_LIGHTING);
}
/* Scene dessinee */
void cubeSansNormales(void){
float c = 0.5F;
glPushMatrix();
glBegin(GL_QUADS);
{ glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glVertex3f(c,c,c);
glVertex3f(-c,c,c);
glVertex3f(-c,-c,c);
glVertex3f(c,-c,c); }
{ glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,-c,c);
glVertex3f(-c,c,c); }
{ glVertex3f(c,c,c);
glVertex3f(c,-c,c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glVertex3f(-c,-c,c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,-c,c); }
{ glVertex3f(c,c,c);
glVertex3f(c,c,-c);
glVertex3f(-c,c,-c);
glVertex3f(-c,c,c); }
glEnd();
glPopMatrix();
}
void cubeAvecNormales(){
float c = 0.5F;
glPushMatrix();
glNormal3f(0.0F,0.0F,1.0F);
glBegin(GL_QUADS);
{ glNormal3f(0.0F,0.0F,-1.0F);
glVertex3f(c,c,-c);
glVertex3f(c,-c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,c,-c); }
{ glNormal3f(0.0F,0.0F,1.0F);
glVertex3f(c,c,c);
glVertex3f(-c,c,c);
glVertex3f(-c,-c,c);
glVertex3f(c,-c,c); }
{ glNormal3f(-1.0F,0.0F,0.0F);
glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,-c,c);
glVertex3f(-c,c,c); }
{ glNormal3f(1.0F,0.0F,0.0F);
glVertex3f(c,c,c);
glVertex3f(c,-c,c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glNormal3f(0.0F,-1.0F,0.0F);
glVertex3f(-c,-c,c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,-c,c); }
{ glNormal3f(0.0F,1.0F,0.0F);
glVertex3f(c,c,c);
glVertex3f(c,c,-c);
glVertex3f(-c,c,-c);
glVertex3f(-c,c,c); }
glEnd();
glPopMatrix();
}
void mySolidCylinder(int n,int m) {
glPushMatrix();
for ( int j = 0 ; j < m ; j++ ) {
float hi = 1.0F-j*2.0F/m;
float hf = hi-2.0F/m;
glBegin(GL_QUAD_STRIP);
for( int i = 0 ; i <= n ; i++ ){
float a = (2*M_PI*i)/n;
float sn = -sin(a);
float cs = cos(a);
glNormal3f(cs,0.0F,sn);
glVertex3f(cs,hi,sn);
glVertex3f(cs,hf,sn); }
glEnd(); }
glPopMatrix();
}
void scene() {
glPushMatrix();
switch ( obj ) {
case 0 :
cubeAvecNormales();
break;
case 1 :
cubeSansNormales();
break;
case 2 :
glScalef(0.5F,0.5F,0.5F);
mySolidCylinder(n,m);
break; }
glPopMatrix();
}
/* Fonction executee lors d'un rafraichissement */
/* de la fenetre de dessin */
void display(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(rx,1.0F,0.0F,0.0F);
glRotatef(ry,0.0F,1.0F,0.0F);
glRotatef(rz,0.0F,0.0F,1.0F);
if ( obj == 2 ) {
const GLfloat light0_pos[] = { 0.5, 0.3, 0.5,1.0 };
const GLfloat light1_pos[] = { -0.5, 0.0, 0.5,1.0 };
const GLfloat light2_pos[] = { 0.5,-0.3,-0.5,1.0 };
glLightfv(GL_LIGHT0,GL_POSITION,light0_pos);
glLightfv(GL_LIGHT1,GL_POSITION,light1_pos);
glLightfv(GL_LIGHT2,GL_POSITION,light2_pos);
glDisable(GL_LIGHTING);
glPushMatrix();
glTranslatef(light0_pos[0],light0_pos[1],light0_pos[2]);
glColor3fv(rouge);
glutSolidSphere(0.02,36,36);
glPopMatrix();
glPushMatrix();
glTranslatef(light1_pos[0],light1_pos[1],light1_pos[2]);
glColor3fv(jaune);
glutSolidSphere(0.02,36,36);
glPopMatrix();
glPushMatrix();
glTranslatef(light2_pos[0],light2_pos[1],light2_pos[2]);
glColor3fv(bleu);
glutSolidSphere(0.02,36,36);
glPopMatrix();
glEnable(GL_LIGHTING); }
else {
const GLfloat light0_dir[] = { 0.7, 0.3, 0.7,0.0 };
const GLfloat light1_dir[] = { -0.7, 0.0, 0.7,0.0 };
const GLfloat light2_dir[] = { 0.7,-0.3,-0.7,0.0 };
glLightfv(GL_LIGHT0,GL_POSITION,light0_dir);
glLightfv(GL_LIGHT1,GL_POSITION,light1_dir);
glLightfv(GL_LIGHT2,GL_POSITION,light2_dir); }
scene();
glPopMatrix();
glFlush();
glutSwapBuffers();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("Erreur OpenGL\n",error);
}
/* Fonction executee lorsqu'aucun evenement */
/* n'est en file d'attente */
void idle(void) {
rx += 0.14256F ;
ry += 0.06117F ;
rz += 0.04174F ;
glutPostRedisplay() ;
}
/* Fonction executee lors d'un changement */
/* de la taille de la fenetre OpenGL */
void reshape(int x,int y) {
glViewport(0,0,x,y);
glMatrixMode(GL_PROJECTION) ;
glLoadIdentity() ;
gluPerspective(7.0F,(float) x/y,1.0,40.0) ;
glMatrixMode(GL_MODELVIEW) ;
glLoadIdentity() ;
gluLookAt(0.0,0.0,20.0,0.0,0.0,0.0,0.0,1.0,0.0);
}
/* Fonction executee lors de l'appui */
/* d'une touche alphanumerique du clavier */
void keyboard(unsigned char key,int x,int y) {
switch (key) {
case 'n' :
n--;
if ( n < 3 )
n = 3;
glutPostRedisplay();
break;
case 'N' :
n++;
glutPostRedisplay();
break;
case 'm' :
m--;
if ( m < 1 )
m = 1;
glutPostRedisplay();
break;
case 'M' :
m++;
glutPostRedisplay();
break;
case 'l' :
{ static int lumiere = 0;
lumiere = !lumiere;
if ( lumiere ) {
glLightfv(GL_LIGHT0,GL_DIFFUSE,gris);
glLightfv(GL_LIGHT1,GL_DIFFUSE,gris);
glLightfv(GL_LIGHT2,GL_DIFFUSE,gris);
glEnable(GL_CULL_FACE); }
else {
glLightfv(GL_LIGHT0,GL_DIFFUSE,rouge);
glLightfv(GL_LIGHT1,GL_DIFFUSE,jaune);
glLightfv(GL_LIGHT2,GL_DIFFUSE,bleu);
glDisable(GL_CULL_FACE); } }
glutPostRedisplay();
break;
case 'c' :
{ static int culling = 0;
culling = !culling;
if ( culling )
glEnable(GL_CULL_FACE);
else
glDisable(GL_CULL_FACE); }
glutPostRedisplay();
break;
case 'f' :
{ static int face = 1;
face = !face;
glPolygonMode(GL_FRONT_AND_BACK,( face ) ? GL_FILL : GL_LINE); }
glutPostRedisplay();
break;
case 0x20 :
obj = (obj+1)%3;
glutPostRedisplay();
break;
case 0x0D :
{ static int anim = 1;
anim = !anim;
glutIdleFunc(( anim ) ? idle : NULL); }
break;
case 0x1B :
exit(0);
break; }
}
/* Fonction executee lors de l'appui */
/* d'une touche de curseur ou d'une touche */
/* page up ou page down */
void special(int key,int x,int y) {
switch(key) {
case GLUT_KEY_UP :
rx++;
glutPostRedisplay() ;
break;
case GLUT_KEY_DOWN :
rx--;
glutPostRedisplay() ;
break;
case GLUT_KEY_LEFT :
ry++;
glutPostRedisplay() ;
break;
case GLUT_KEY_RIGHT :
ry--;
glutPostRedisplay() ;
break;
case GLUT_KEY_PAGE_UP :
rz++;
glutPostRedisplay() ;
break;
case GLUT_KEY_PAGE_DOWN :
rz--;
glutPostRedisplay() ;
break; }
}
/* Fonction principale */
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
glutInitWindowSize(300,300);
glutInitWindowPosition(50,50);
glutCreateWindow("Cubes et cylindre par facettes");
init();
glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutReshapeFunc(reshape);
glutIdleFunc(idle);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}
RETOUR