Probleme OPENGL , affichage des couleurs en non transparence
Probleme OPENGL , affichage des couleurs en non transparence - C++ - Programmation
Marsh Posté le 09-07-2002 à 18:02:09
As-tu pensé a activer le test du Z-Buffer ??
glEnable( GL_DEPTH_TEST );
...
rendu des axes...
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Marsh Posté le 09-07-2002 à 17:14:00
voila mon pobleme , je me suis crévé le cul à dessiner 3 axes (x,y,z) en polygone afin d'attibuer une couleur à chacun .le probleme est que la couleur rouge de l'axe x prédomine sur les autre et l'on est vite perdu .
aidez moi svp
//axe y
{
//arriere
glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,1.0);
glColor3ub(0,0,255);
{
glVertex3d( -petite_distance, petite_distance ,longue_distance );
glVertex3d( 0 ,petite_distance , longue_distance );
glVertex3d(0, 0 , longue_distance );
glVertex3d(-petite_distance , 0 , longue_distance);
}
glEnd();
//avant
glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,-1.0);
glColor3ub(0,0,255);
{
glVertex3d( -petite_distance ,petite_distance ,petite_distance );
glVertex3d( 0 , petite_distance , petite_distance );
glVertex3d(0 , 0 , petite_distance );
glVertex3d(-petite_distance, 0 , petite_distance );
}
glEnd();
//dessus
glBegin(GL_POLYGON);
glNormal3d(0.0,1.0,0.0);
glColor3ub(0,0,255);
{
glVertex3d( -petite_distance ,petite_distance ,petite_distance );
glVertex3d( 0 , petite_distance , petite_distance );
glVertex3d( 0 ,petite_distance , longue_distance );
glVertex3d( -petite_distance, petite_distance ,longue_distance );
}
glEnd();
//dessous
glBegin(GL_POLYGON);
glNormal3d(0.0,-1.0,0.0);
glColor3ub(0,0,255);
{
glVertex3d( -petite_distance , 0 , longue_distance );
glVertex3d( 0 , 0 , longue_distance );
glVertex3d( 0 , 0 , petite_distance);
glVertex3d( -petite_distance , 0, petite_distance );
}
glEnd();
//gauche
glBegin(GL_POLYGON);
glNormal3d(-1.0,0.0,0.0);
glColor3ub(0,0,255);
{
glVertex3d(-petite_distance,petite_distance,petite_distance);
glVertex3d(-petite_distance,petite_distance,longue_distance);
glVertex3d( -petite_distance,0,longue_distance);
glVertex3d(-petite_distance,0,petite_distance);
}
glEnd();
//droite
glBegin(GL_POLYGON);
glNormal3d(1.0,0.0,0.0);
glColor3ub(0,0,255);
{
glVertex3d( 0,0,petite_distance );
glVertex3d(0,0,longue_distance);
glVertex3d( 0,petite_distance,longue_distance);
glVertex3d(0,petite_distance,petite_distance);
}
glEnd();
}
//Axe Z
{
//arriere
glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,1.0);
glVertex3d(-petite_distance,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d( 0,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,0,petite_distance);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,0,petite_distance);
glEnd();
//avant
glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,-1.0);
glVertex3d(-petite_distance,longue_distance,0);
glColor3ub(0,255,0);
glVertex3d(0,longue_distance,0);
glColor3ub(0,255,0);
glVertex3d(0,0,0);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,0,0);
glEnd();
//dessus
glBegin(GL_POLYGON);
glNormal3d(0.0,1.0,0.0);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,longue_distance,0);
glColor3ub(0,255,0);
glVertex3d( -petite_distance,longue_distance,0);
glEnd();
//dessous
glBegin(GL_POLYGON);
glNormal3d(0.0,-1.0,0.0);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,0,petite_distance);
glColor3ub(0,255,0);
glVertex3d( 0,0,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,0,0);
glColor3ub(0,255,0);
glVertex3d( -petite_distance,0,0);
glEnd();
//gauche
glBegin(GL_POLYGON);
glNormal3d(-1.0,0.0,0.0);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,longue_distance,0);
glColor3ub(0,255,0);
glVertex3d( -petite_distance,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,0,petite_distance);
glColor3ub(0,255,0);
glVertex3d(-petite_distance,0,0);
glEnd();
//droite
glBegin(GL_POLYGON);
glNormal3d(1.0,0.0,0.0);
glColor3ub(0,255,0);
glVertex3d(0,longue_distance,0);
glColor3ub(0,255,0);
glVertex3d( 0,longue_distance,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,0,petite_distance);
glColor3ub(0,255,0);
glVertex3d(0,0,0);
glEnd();
}
//Axe -X
{
//arriere
glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,1.0);
glVertex3d(-longue_distance,petite_distance,petite_distance);
glColor3ub(255,0,0);
glVertex3d( -petite_distance,petite_distance,petite_distance);
glColor3ub(255,0,0);
glVertex3d(-petite_distance,0,petite_distance);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,0,petite_distance);
glEnd();
//avant
/* glBegin(GL_POLYGON);
glNormal3d(0.0,0.0,-1.0);
glVertex3d(-petite_distance,longue_distance,0);
glColor3ub(255,0,0);
glVertex3d(0,longue_distance,0);
glColor3ub(255,0,0);
glVertex3d(0,0,0);
glColor3ub(255,0,0);
glVertex3d(-petite_distance,0,0);
glEnd();*/
//dessus
glBegin(GL_POLYGON);
glNormal3d(0.0,1.0,0.0);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,petite_distance,0);
glColor3ub(255,0,0);
glVertex3d(-petite_distance,petite_distance,0);
glColor3ub(255,0,0);
glVertex3d(-petite_distance,0,0);
glColor3ub(255,0,0);
glVertex3d( -longue_distance,0,0);
glEnd();
//dessous
glBegin(GL_POLYGON);
glNormal3d(0.0,-1.0,0.0);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,0,petite_distance);
glColor3ub(255,0,0);
glVertex3d( -petite_distance,0,petite_distance);
glColor3ub(255,0,0);
glVertex3d(-petite_distance,0,0);
glColor3ub(255,0,0);
glVertex3d( -longue_distance,0,0);
glEnd();
//gauche
glBegin(GL_POLYGON);
glNormal3d(-1.0,0.0,0.0);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,petite_distance,0);
glColor3ub(255,0,0);
glVertex3d( -longue_distance,petite_distance,petite_distance);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,0,petite_distance);
glColor3ub(255,0,0);
glVertex3d(-longue_distance,0,0);
glEnd();
//droite
/* glBegin(GL_POLYGON);
glNormal3d(1.0,0.0,0.0);
glColor3ub(0,0,255);
glVertex3d(0,longue_distance,0);
glColor3ub(0,0,255);
glVertex3d( 0,longue_distance,petite_distance);
glColor3ub(0,0,255);
glVertex3d(0,0,petite_distance);
glColor3ub(0,0,255);
glVertex3d(0,0,0);
glEnd();*/
}