Problème de shadow mapping

**bobbysinger** · 06/04/2010, 20h28

Bonjour,

J'ai quelques difficultés à faire du shadow mapping et j'aimerais savoir
ce qui cloche avec le code ci-dessous: l'image finale devrait être un plan
rose avec une sphère jaune qui projette son ombre sur le plan rose mais il n'y a pas l'ombre d'une ombre!!!.

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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glDisable(GL_DEPTH_TEST);
    glDisable(GL_LIGHT0);
    glDisable(GL_LIGHTING);
 
    // On active l'éclairage ombrée et son impact sur le matériel
    GLfloat ambient[] = {0.0,0.0,0.0,0.0};
    GLfloat position[] = {0.5,1.3,0.5};
 
    GLfloat diffuse[] = {0.2,0.2,0.2,0.0};
    GLfloat specular[] = {0.0,0.0,0.0,0.0};
    GLfloat shininess[] = {0};
 
    GLfloat ambiantMat[] = {0.0,0.0,0.0,0.0};
    GLfloat diffuseMat[] = {0.2,0.2,0.2,0.0};
    GLfloat emissiveMat[] = {0.0,0.0,0.0,1.0};
    GLfloat specularMat[] = {0.0,0.0,0.0,0.0};
    GLfloat shininessMat[] = {0};
 
    glLightfv(GL_LIGHT0, GL_POSITION, position);
    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
    glLightfv(GL_LIGHT0, GL_SHININESS, shininess);
 
    glMaterialfv(GL_FRONT, GL_AMBIENT, ambiantMat);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMat);
    glMaterialfv(GL_FRONT, GL_EMISSION, emissiveMat);
    glMaterialfv(GL_FRONT, GL_SPECULAR, specularMat);
    glMaterialfv(GL_FRONT, GL_SHININESS, shininessMat);
 
    glMaterialfv(GL_BACK, GL_AMBIENT, ambiantMat);
    glMaterialfv(GL_BACK, GL_DIFFUSE, diffuseMat);
    glMaterialfv(GL_BACK, GL_EMISSION, emissiveMat);
    glMaterialfv(GL_BACK, GL_SPECULAR, specularMat);
    glMaterialfv(GL_BACK, GL_SHININESS, shininessMat);
 
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);
 
    GLint viewport[4];
    GLfloat lightPos[3];
    glGetLightfv(GL_LIGHT0,GL_POSITION,lightPos);
    glGetIntegerv(GL_VIEWPORT,viewport);
    glViewport(0,0,1024,1024);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluPerspective(90, 4/3, 0.1, 10);
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    gluLookAt(lightPos[0],lightPos[1],lightPos[2], 0,0,0, 0,1,0);
 
    //---Debut Dessin 1--------------------------------
    glMatrixMode(GL_MODELVIEW);
 
    glPushMatrix();
    glLoadIdentity();
 
        GLUquadricObj* cyl = gluNewQuadric();
        glColor3f(1,1,0);
        glTranslatef(0.4,0.4,0.4);
        gluSphere(cyl, 0.2, 100, 100);
 
    glPopMatrix();
 
    glPushMatrix();
    glLoadIdentity();
        glTranslatef(-0.4,-0.4,-0.4);
        glBegin(GL_POLYGON);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glVertex3f(-1.0,0.0,1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glVertex3f(1.0,0.0,1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glVertex3f(1.0,0.0,-1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glVertex3f(-1.0,0.0,-1.0);
 
        glEnd();
 
    glPopMatrix();
 
 
    glLoadIdentity();
    //---Fin Dessin 1----------------------------------
 
    glPopMatrix();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
 
    glEnable(GL_DEPTH_TEST);
 
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 0, 0, 1024, 1024,0);
    glViewport(viewport[0],viewport[1],viewport[2],viewport[3]);
 
    GLfloat tempMat[16];
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    glTranslatef(0.5,0.5,0.0);
    glScalef(0.5,0.5,1.0);
    gluPerspective(90, 4/3, 0.1, 10);
    gluLookAt(0,2,2, 0,0,0, 0,1,0);
    glGetFloatv(GL_MODELVIEW,tempMat);
    glPopMatrix();
 
    //transposition de la matrice
 
    GLfloat *t = TransposeMat(tempMat);//retourne un pointeur vers float i[16]
 
    //--------
 
    glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
    glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
    glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
    glTexGeni(GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
 
    glTexGenfv(GL_S, GL_OBJECT_PLANE, &t[0]);
    glTexGenfv(GL_T, GL_OBJECT_PLANE, &t[4]);
    glTexGenfv(GL_R, GL_OBJECT_PLANE, &t[8]);
    glTexGenfv(GL_Q, GL_OBJECT_PLANE, &t[12]);
 
    glEnable(GL_TEXTURE_GEN_S);
    glEnable(GL_TEXTURE_GEN_T);
    glEnable(GL_TEXTURE_GEN_R);
    glEnable(GL_TEXTURE_GEN_Q);
 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
    glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
    glEnable(GL_TEXTURE_2D);
 
    //---Debut Dessin 1--------------------------------
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
 
    glDisable(GL_LIGHT0);
    glDisable(GL_LIGHTING);
 
// On augmente l'éclairage
     ambient[0] = 0.3;
     ambient[1] = 0.3;
     ambient[2] = 0.3;
     diffuse[0] = 0.7;
     diffuse[1] = 0.7;
     diffuse[2] = 0.7;
     specular[0] = 0.1;
     specular[1] = 0.1;
     specular[2] = 0.1;
     emissiveMat[0] = 0.0;
     emissiveMat[1] = 0.0;
     emissiveMat[2] = 0.0;
     specularMat[0] = 0.1;
     specularMat[1] = 0.1;
     specularMat[2] = 0.1;
     shininess[0] = 0.7;
     shininessMat[0] = 0.7;
     ambiantMat[0] = 1;
     ambiantMat[1] = 1;
     ambiantMat[2] = 1;
     diffuseMat[0] = 1;
     diffuseMat[1] = 1;
     diffuseMat[2] = 1;
 
    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
    glLightfv(GL_LIGHT0, GL_SHININESS, shininess);
 
    glMaterialfv(GL_FRONT, GL_AMBIENT, ambiantMat);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMat);
    glMaterialfv(GL_FRONT, GL_EMISSION, emissiveMat);
    glMaterialfv(GL_FRONT, GL_SPECULAR, specularMat);
    glMaterialfv(GL_FRONT, GL_SHININESS, shininessMat);
 
    glMaterialfv(GL_BACK, GL_AMBIENT, ambiantMat);
    glMaterialfv(GL_BACK, GL_DIFFUSE, diffuseMat);
    glMaterialfv(GL_BACK, GL_EMISSION, emissiveMat);
    glMaterialfv(GL_BACK, GL_SPECULAR, specularMat);
    glMaterialfv(GL_BACK, GL_SHININESS, shininessMat);
 
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);
 
    glPushMatrix();
    glLoadIdentity();
 
        GLUquadricObj* cyl1 = gluNewQuadric();
        glColor3f(1,1,0);
        glTranslatef(0.4,0.4,0.4);
        gluSphere(cyl1, 0.2, 100, 100);
 
    glPopMatrix();
 
    glPushMatrix();
    glLoadIdentity();
 
        glBegin(GL_POLYGON);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glTexCoord2f(1.0, 0.0);
           glVertex3f(-1.0,0.0,1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glTexCoord2f(1.0, 1.0);
           glVertex3f(1.0,0.0,1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glTexCoord2f(0.0, 1.0);
           glVertex3f(1.0,0.0,-1.0);
 
           glNormal3f(0,1,0);
           glColor3f(1,0,1);
           glTexCoord2f(0.0, 0.0);
           glVertex3f(-1.0,0.0,-1.0);
 
        glEnd();
        glPopMatrix();
 
    glDisable(GL_TEXTURE_2D);
    glDisable(GL_TEXTURE_GEN_S);
    glDisable(GL_TEXTURE_GEN_T);
    glDisable(GL_TEXTURE_GEN_R);
    glDisable(GL_TEXTURE_GEN_Q);

Merci et j'attends vos commentaire impatiemment.

Note: Je ne veux pas m'inspirer de NeHe ou de Paul's projects, je ne veux qu'une ombre des plus basiques et j'ai visualisé les 72 pages du forum sur OpenGL sans rien trouver qui aurait pu m'aider, enfin je penses.

**LittleWhite** · 07/04/2010, 00h32

Bonjour,

Le forum supporte des balises [ C O D E ] et [ / C O D E ] ( sans les espaces ) qui facilite la lecture du code. Ces balises peuvent être automatiquement ajouter avec le bouton '#'. Veuillez englober votre code dans de tel balise, et je reviendrai voir le code.

De plus, il serai préférable d'envoyer une capture d'écran, explicitant le problème. Merci

**bobbysinger** · 07/04/2010, 01h01

Voici le code avec de belles balises:

Code :

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glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHT0);
glDisable(GL_LIGHTING);
 
// On active l'éclairage ombrée et son impact sur le matériel
GLfloat ambient[] = {0.0,0.0,0.0,0.0};
GLfloat position[] = {0.5,1.3,0.5};
 
GLfloat diffuse[] = {0.2,0.2,0.2,0.0};
GLfloat specular[] = {0.0,0.0,0.0,0.0};
GLfloat shininess[] = {0};
 
GLfloat ambiantMat[] = {0.0,0.0,0.0,0.0};
GLfloat diffuseMat[] = {0.2,0.2,0.2,0.0};
GLfloat emissiveMat[] = {0.0,0.0,0.0,1.0};
GLfloat specularMat[] = {0.0,0.0,0.0,0.0};
GLfloat shininessMat[] = {0};
 
glLightfv(GL_LIGHT0, GL_POSITION, position);
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
glLightfv(GL_LIGHT0, GL_SHININESS, shininess);
 
glMaterialfv(GL_FRONT, GL_AMBIENT, ambiantMat);
glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMat);
glMaterialfv(GL_FRONT, GL_EMISSION, emissiveMat);
glMaterialfv(GL_FRONT, GL_SPECULAR, specularMat);
glMaterialfv(GL_FRONT, GL_SHININESS, shininessMat);
 
glMaterialfv(GL_BACK, GL_AMBIENT, ambiantMat);
glMaterialfv(GL_BACK, GL_DIFFUSE, diffuseMat);
glMaterialfv(GL_BACK, GL_EMISSION, emissiveMat);
glMaterialfv(GL_BACK, GL_SPECULAR, specularMat);
glMaterialfv(GL_BACK, GL_SHININESS, shininessMat);
 
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
 
GLint viewport[4];
GLfloat lightPos[3];
glGetLightfv(GL_LIGHT0,GL_POSITION,lightPos);
glGetIntegerv(GL_VIEWPORT,viewport);
glViewport(0,0,1024,1024);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPerspective(90, 4/3, 0.1, 10);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
gluLookAt(lightPos[0],lightPos[1],lightPos[2], 0,0,0, 0,1,0);
 
//---Debut Dessin 1--------------------------------
glMatrixMode(GL_MODELVIEW);
 
glPushMatrix();
glLoadIdentity();
 
GLUquadricObj* cyl = gluNewQuadric();
glColor3f(1,1,0);
glTranslatef(0.4,0.4,0.4);
gluSphere(cyl, 0.2, 100, 100);
 
glPopMatrix();
 
glPushMatrix();
glLoadIdentity();
glTranslatef(-0.4,-0.4,-0.4);
glBegin(GL_POLYGON);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glVertex3f(-1.0,0.0,1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glVertex3f(1.0,0.0,1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glVertex3f(1.0,0.0,-1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glVertex3f(-1.0,0.0,-1.0);
 
glEnd();
 
glPopMatrix();
 
 
glLoadIdentity();
//---Fin Dessin 1----------------------------------
 
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
 
glEnable(GL_DEPTH_TEST);
 
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 0, 0, 1024, 1024,0);
glViewport(viewport[0],viewport[1],viewport[2],viewport[3]);
 
GLfloat tempMat[16];
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glTranslatef(0.5,0.5,0.0);
glScalef(0.5,0.5,1.0);
gluPerspective(90, 4/3, 0.1, 10);
gluLookAt(0,2,2, 0,0,0, 0,1,0);
glGetFloatv(GL_MODELVIEW,tempMat);
glPopMatrix();
 
//transposition de la matrice
 
GLfloat *t = TransposeMat(tempMat);//retourne un pointeur vers float i[16]
 
//--------
 
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGeni(GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
 
glTexGenfv(GL_S, GL_OBJECT_PLANE, &t[0]);
glTexGenfv(GL_T, GL_OBJECT_PLANE, &t[4]);
glTexGenfv(GL_R, GL_OBJECT_PLANE, &t[8]);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, &t[12]);
 
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_GEN_R);
glEnable(GL_TEXTURE_GEN_Q);
 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
glEnable(GL_TEXTURE_2D);
 
//---Debut Dessin 1--------------------------------
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
 
glDisable(GL_LIGHT0);
glDisable(GL_LIGHTING);
 
// On augmente l'éclairage
ambient[0] = 0.3;
ambient[1] = 0.3;
ambient[2] = 0.3;
diffuse[0] = 0.7;
diffuse[1] = 0.7;
diffuse[2] = 0.7;
specular[0] = 0.1;
specular[1] = 0.1;
specular[2] = 0.1;
emissiveMat[0] = 0.0;
emissiveMat[1] = 0.0;
emissiveMat[2] = 0.0;
specularMat[0] = 0.1;
specularMat[1] = 0.1;
specularMat[2] = 0.1;
shininess[0] = 0.7;
shininessMat[0] = 0.7;
ambiantMat[0] = 1;
ambiantMat[1] = 1;
ambiantMat[2] = 1;
diffuseMat[0] = 1;
diffuseMat[1] = 1;
diffuseMat[2] = 1;
 
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
glLightfv(GL_LIGHT0, GL_SHININESS, shininess);
 
glMaterialfv(GL_FRONT, GL_AMBIENT, ambiantMat);
glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMat);
glMaterialfv(GL_FRONT, GL_EMISSION, emissiveMat);
glMaterialfv(GL_FRONT, GL_SPECULAR, specularMat);
glMaterialfv(GL_FRONT, GL_SHININESS, shininessMat);
 
glMaterialfv(GL_BACK, GL_AMBIENT, ambiantMat);
glMaterialfv(GL_BACK, GL_DIFFUSE, diffuseMat);
glMaterialfv(GL_BACK, GL_EMISSION, emissiveMat);
glMaterialfv(GL_BACK, GL_SPECULAR, specularMat);
glMaterialfv(GL_BACK, GL_SHININESS, shininessMat);
 
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
 
glPushMatrix();
glLoadIdentity();
 
GLUquadricObj* cyl1 = gluNewQuadric();
glColor3f(1,1,0);
glTranslatef(0.4,0.4,0.4);
gluSphere(cyl1, 0.2, 100, 100);
 
glPopMatrix();
 
glPushMatrix();
glLoadIdentity();
 
glBegin(GL_POLYGON);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glTexCoord2f(1.0, 0.0);
glVertex3f(-1.0,0.0,1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glTexCoord2f(1.0, 1.0);
glVertex3f(1.0,0.0,1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glTexCoord2f(0.0, 1.0);
glVertex3f(1.0,0.0,-1.0);
 
glNormal3f(0,1,0);
glColor3f(1,0,1);
glTexCoord2f(0.0, 0.0);
glVertex3f(-1.0,0.0,-1.0);
 
glEnd();
glPopMatrix();
 
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_GEN_R);
glDisable(GL_TEXTURE_GEN_Q);

**bobbysinger** · 07/04/2010, 01h05

Merci du conseil, c'est vraiment plus agréable à regarder.

L'image incluse représente ce que je veux au final mais avec une ombre en plus, mais le problème est qu'il n'y en a pas.

Merci

**LittleWhite** · 07/04/2010, 10h28

Merci pour avoir utilise les balises

.

Je crois que je ne comprends pas comment vous voulez faire pour calculer l'ombre.
Il me semble, mais je n'en suis pas sur, que vous dessiner une premiere fois la sphere, d'un certain point de vue et que vous voulez recuperer le buffer de pronfondeur ( mais la j'ai un doute sur la methode ).
Il va falloir, soit commenter le code, soit m'expliquer l'algorithme.

De plus, ceci:

Code :

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glEnable(GL_DEPTH_TEST);
 
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 0, 0, 1024, 1024,0);

Ne vas pas fonctionner je crois. Vu que premierement, comme vous n'activer le buffer de profondeur juste avant, donc pour le moment rien n'a ete ecrit dedans.
De plus, faire une copy de l'ecran dans une texture, alors qu'il n'y a pas eu de creation de texture ( glGenTexture() ), ne vas surement pas fonctionner.

Voici mon premier apercu du code

.

Problème de shadow mapping

OpenGL

Vue hybride

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