no rendering of object on screen????

hello,

I really dont know whats wrong with the code.I am new to opengl and could not figure out ,why I am not seeing anything on screen.

#include<Windows.h>
#include<stdlib.h>
#include<gl/GL.h>
#include<gl/GLU.h>
#include<gl/glut.h>

using namespace std;

void initrendering()
{
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
glClearColor(1.0,0.3,0.8,1.0);
}

void keypres(unsigned char key, int w,int h)
{
switch(key){
case 27:exit(0);
}
}

void resize(int w,int h)
{
glViewport(0,0,w,h);
gluPerspective(60,(double)w/h,1.0,200.0);
}

bool movingup=false;
float trans=0.0f;
float rotat=0.0f;

void drawscene()
{
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix();
glTranslatef(0.0,0.0,-5.0);

 glTranslatef(0.0,trans,0.0);
 glRotatef(rotat,0.0,1.0,0.0);

 glutWireCube(1.0);

 glPopMatrix();
// glFlush();

 if (movingup)    
  trans -= 0.005f;   
 else    
  trans += 0.005f;  

 if (trans &lt; -3.0f)   
   movingup = false;   
 else if (trans &gt; 3.0f)   
   movingup = true;   
 rotat += 0.005f;   

 if (rotat &gt; 360.0f)   
  rotat -= 360.0f;   

 glutSwapBuffers();

}

int main(int argc, char** argv) {

glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE| GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(400, 400); 

glutCreateWindow("UP AND DOWN");
initrendering(); 

glutDisplayFunc(drawscene);
glutIdleFunc(drawscene);
glutKeyboardFunc(keypres);
glutReshapeFunc(resize);

glutMainLoop(); 
return 0;

}

Please help, most of my codes are not rendering anything on screen.

Regards

Abhinav

General problem: Please always include you code in the [ code ][/ code ] tags.

This problem: Two things.

  1. You have depth test enabled and you are not clearing the depth buffer bit. Change the glClear call to this.

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

  1. You need to set the current matrix to projection before calling gluPerspective. So the resize function becomes this,

void resize(int w,int h)
{
   glViewport(0,0,w,h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(60,(double)w/h,1,200.0);
}

See if this helps.

Thanks for the reply…
and yes it worked…thanks again