Hi, I am trying to render a shape after some time has elapsed. Instead of using a timer i am trying to use a simple counter. This is the code i have so far

  
static int counter = 0;
GLfloat tri_x, tri_y, tri_z;

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();
	
glBegin(GL_POINTS);
glColor3f(1.0f, 1.0f, 1.0f);
for(int i = 0; i <= 1024; i++)
	glVertex3f(stars1[i].x, stars1[i].y, stars1[i].z);
glEnd();

glBegin(GL_POINTS);
glColor3f(1.0f, 1.0f, 1.0f);
for(i = 0; i <= 1024; i++) {
	glVertex3f(stars2[i].x, stars2[i].y, stars2[i].z);
}
glEnd();

if(counter == 10) {
	glBegin(GL_TRIANGLE_FAN);
	glColor3f(1.0f, 0.3f, 0.2f);		
	for(i = 0; i <= 2.0f * 3.14 * 3; i++) {
		tri_x = 2.0f * cos(i) * 3;
		tri_y = 2.0f * sin(i) * 3;
		tri_z = -1000.0f;
		glVertex3f(tri_x, tri_y, tri_z);
	}
	glEnd();
}

glPopMatrix();

glFlush();

if(counter >= 10)
    counter = 10;

counter++;

  

Now the code in if never gets executed. I think I am going wrong somewhere but what am I doing wrong ? I am doing it the same way as the following is done. Without the if however it does draw to screen.

  
glRotatef(angle, 1.0, 0.0, 0.0); 
....
if(angle >= 360.0f) 
      angle = 0.0; 

angle++; 
  

Hope someone can help. Thank you.

You clamp the counter to 10, then increment, for an eventual count of 11.

You should increment, then clamp.

And/or change your display query from (==10) to (>=10).

Or chuck the whole idea and do it right, track the real time.

I use glut, so a simple:

int millisecTime=glutGet(GLUT_ELAPSED_TIME);

zin



zintel.com - 3d graphics & more or less