hi, i have a texture mapped rotating object and other still objects in a scene. i have put the rotations in the idle function. the problem is i am experiencing a lot of flickering . if i stop the glutPostRedisplay() then there is no flickering and no rotations also. how do i get the object to rotate without any flickerings

Moving to the OpenGL forum.

here is the code........only mentioning the functions and where i have put the glClear(). i'm not mentioning the other functions that read the textures and bind them........


#include <math.h>
#include <stdio.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glaux.h>
#include <GL/glu.h>


void display(void) {

//****viewport 1 (Perspective view seen from the camera.)

glMatrixMode( GL_PROJECTION);
glLoadIdentity();
gluPerspective( fovy_1, (double) width/winHeight_1, near_1, far_1);

glMatrixMode( GL_MODELVIEW);
glLoadIdentity();
gluLookAt( xcam_1, ycam_1, zcam_1, xfoc_1, yfoc_1, zfoc_1, 0., 1., 0.);

draw();//draws a rotating earth

if ( showAxis_1 ) {
glDisable( GL_LIGHTING);
glDisable(GL_DEPTH_TEST);

axes_1( xyzmax_1);
}

//****End of Viewport 1*/

if (showCamera_1) {

//****ViewPort2 (Orthogonal view seen from a location on positive z)
glMatrixMode( GL_PROJECTION);
glLoadIdentity();
glOrtho( -w, w, -w, w, -far_1*w, far_1*w);

glMatrixMode( GL_MODELVIEW);
glLoadIdentity();

draw(); //Draws the same rotating earth in this smaller viewport
camera_1(); //Draw the camera
frustum_1(); //Draw the frustum
//****End of Viewport2

/****Viewport3 (Orthogonal view seen from a location on positive y)*/

glMatrixMode( GL_PROJECTION);
glLoadIdentity();
glOrtho( -w, w, -w, w, -far_1*w, far_1*w);

glMatrixMode( GL_MODELVIEW);
glLoadIdentity();
gluLookAt( 0., 2., 0., 0., 0., 0., 0., 0., -1.);

draw(); //Draw the object
camera_1(); //draw camera and the focal point
frustum_1(); //Draw the frustum*/

//****End Viewport3*/

}

glutSwapBuffers();

}


void Init() {

glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);

glutInitWindowSize(winWidth_1, winHeight_1);

glutCreateWindow("");

glutReshapeFunc( reShape_1);

glutDisplayFunc(display);
glutSpecialFunc(specialKey_1);
glutKeyboardFunc( keyBoard_1);

glutMouseFunc(mouse);
glutMotionFunc(mouse_motion);


glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

void idle_func ( void )
{
/*update some rotations here*/

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glutPostRedisplay ( );



}

int main(int argc, char **argv) {
glutInit(&argc, argv);
Init();
init();
glutIdleFunc ( idle_func );
glutMainLoop();
return 0;

} //main()