glut sphere

Hi! I have the answer for it to you!!!

First you will need change GLUT_SINGLE to GLUT_DOUBLE (is more used for 3d animations)

Then, if you put a light in some direction, will could help you see the sphere rotating.

Take a look at OpenGL RedBook for more info.

Good Lucky!!!

Rafael G. Donato

changing to GLUT_DOUBLE gives me a blank window and the spehere shouldnt rotate, it the "system" it must be drawn into, must be rotated just one time, to draw the sphere right.

Well, I used your code and made some modifications....
Sorry the English, but I''m Brazilian.
I made the keyboard rotate the Sphere, with LEFT and UP keys.
ESC exits too.

View if is this you wanna make...
It''s compiled in Dev-C/C++, with Project Options, compile as C++
Linker: -l?OpenGL32 -lGlu32 -lGlut32
And in in32 GUI.
----------------------------------------

#include <GL/glut.h>

float xf = 90.0;
float yf = 1.0;

void renderScene()
{
glClear( GL_COLOR_BUFFER_BIT );
glColor3f( 0.0, 1.0, 0.0 );

glRotatef( xf, 1.0, 0.0, yf );

glPopMatrix();
glutWireSphere( 1.0, 12, 12 );
glFlush();

glutSwapBuffers();

}

void keyboard( unsigned char key, int x, int y ) {

switch( key ) {

case 27:
exit( 1 );
break;

}

}

void spec_keyboard( int key, int x, int y ) {

switch( key ) {

case GLUT_KEY_UP:
xf += 0.001;
glutPostRedisplay();
break;

case GLUT_KEY_LEFT:
yf -= 0.01;
glutPostRedisplay();
break;

}

}

void changeSize( int w, int h )
{
if(h==0)
h=1;

glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glViewport( 0, 0, w, h );
gluPerspective( 45, ( float ) w/h, 1, 1000 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( 0.0,0.0,5.0, 0.0,0.0,-1.0, 0.0f,1.0f,0.0f );
}

int main(int argc, char *argv[])
{
glutInit( &argc, argv );
glutInitWindowPosition( -1, -1 );
glutInitWindowSize( 1024, 768 );
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
glutCreateWindow( "Globe" );
glutDisplayFunc( renderScene );
glutReshapeFunc( changeSize );

glutSpecialFunc( spec_keyboard );
glutKeyboardFunc( keyboard );

glutMainLoop();
return 0;
}

--------------------------

Good Lucky Again.

If you would take your app and it would be in a window and when you move the window and let it go, then still the sphere moves. But thanks anyway.
I took my own code, and tried various things with it, and by puting glPopMatrix() before and glPushMatrix() after the glutWireSphere(), i got that thing working properly.
It would still be nice, if somebody will explain me/us why is that.

[edited by - emzee on June 15, 2002 8:41:40 AM]

Hey, you''re right!!! I understand now what you''re talking about!!

I fix it! Sorry for before, but I''m brazilian and I have much to learn about interpretation in English! (

here''s the code
=====================================
#include <GL/glut.h>

float xf = 90.0;
float yf = 1.0;

void renderScene()
{
glClear( GL_COLOR_BUFFER_BIT );
glColor3f( 0.0, 1.0, 0.0 );

glPushMatrix(); //Where you are pushing the matrix in your code???You only finish it!!

glRotatef( xf, 1.0, 0.0, yf ); //this two have to be between the Push and Pop.
glutWireSphere( 1.0, 12, 12 );

glPopMatrix();
glFlush();

glutSwapBuffers();

}

void keyboard( unsigned char key, int x, int y ) {

switch( key ) {

case 27:
exit( 1 );
break;

}

}

void spec_keyboard( int key, int x, int y ) {

switch( key ) {

case GLUT_KEY_UP:
xf += 0.001;
glutPostRedisplay();
break;

case GLUT_KEY_LEFT:
yf -= 0.01;
glutPostRedisplay();
break;

}

}

void changeSize( int w, int h )
{
if(h==0)
h=1;

glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glViewport( 0, 0, w, h );
gluPerspective( 45, ( float ) w/h, 1, 1000 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( 0.0,0.0,5.0, 0.0,0.0,-1.0, 0.0f,1.0f,0.0f );
}

int main(int argc, char *argv[])
{
glutInit( &argc, argv );
glutInitWindowPosition( -1, -1 );
glutInitWindowSize( 1024, 768 );
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
glutCreateWindow( "Globe" );
glutDisplayFunc( renderScene );
glutReshapeFunc( changeSize );

glutSpecialFunc( spec_keyboard );
glutKeyboardFunc( keyboard );

glutMainLoop();
return 0;
}