LinuxQuestions.org - openGL, glut and lights on C++

Hello everyone:

I have a simple scene in openGl, in my display() I have:

Code:

void renderScene()

{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glEnable(GL_DEPTH_TEST);

glEnable(GL_LIGHTING);                        

GLfloat lightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };                

GLfloat ambientPosition[] = {50,50,50,1};                

glLightfv(GL_LIGHT1, GL_AMBIENT, lightAmbient);        

glLightfv(GL_LIGHT1, GL_POSITION, ambientPosition);

glEnable(GL_LIGHT1)



glColor3f(0, 0.9, 0);                                        

glBegin(GL_QUADS);                                

glVertex3f(-100.0f, 0.0f, -100.0f);                

glVertex3f(-100.0f, 0.0f,  100.0f);

glVertex3f( 100.0f, 0.0f,  100.0f);

glVertex3f( 100.0f, 0.0f, -100.0f);

glEnd();



glPushMatrix();

glTranslatef(-40,40,-40);

drawSun();

glPopMatrix();



glPushMatrix();

glTranslatef(-40, 0, -40);

drawWindmill();                

glPopMatrix();



glPushMatrix();

glTranslatef(20, 0, 0);

drawBoy();        

walk();

glPopMatrix();

}

void drawSun()

{        

GLfloat light_position[] = {0,0,0,1};                        

GLfloat light_color[] = {1,1,1,1};

glTranslatef(10,10,10);

glLightfv(GL_LIGHT0, GL_POSITION, light_position);

glLightfv(GL_LIGHT0, GL_SPECULAR, light_color);

glEnable(GL_LIGHT0);

        

glTranslatef(-10, -10, -10);

float size = 10;

glColor3f(1,1,0);

glutSolidSphere(size, 100, 100);

}



int main(int argc, char** argv)

{

        glutInit(&argc, argv);

        glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);

        

        glShadeModel(GL_SMOOTH);

        glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

        

        glutInitWindowPosition(100, 10);

        glutInitWindowSize(700,700);

        glutCreateWindow("My World!");



        glutDisplayFunc(renderScene);

        glutIdleFunc(renderScene);



              glutMainLoop();

        return EXIT_SUCCESS;

}

As you can see drawSun() is just drawing an Sphere and then tries to put a light inside it. But I can't make it work, since if I only add GL_AMBIENT light (at renderScene() )I end up with a black screen, and if I add the light at the drawSun() there appears the light as intended, but everything else loses it's color, it gets only black and white (even tough I do get the light effect, shadows are black and light white).

Why doesn't the ambient light work? thanks

Poeta