Polygon smoothing problem

my code is:

void display() {

			glColor3f(1.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	// Clear The Screen And The Depth Buffer
            gluLookAt(0, 0, 1.2, 0, 0, 0, 0, 1, 0);
			glBegin(GL_TRIANGLES);					// Start Drawing The Pyramid
            glColor3f(0.0f, 1.0f, 0.0f);			// Red

			glVertex3f(-1.0f, 1.0f, 0.0f);			// Top Of Triangle (Front)
            glVertex3f(-1.0f, -1.0f, 0.0f);			// Left Of Triangle (Front)
            glVertex3f(1.0f, -1.0f, 0.0f);			// Right Of Triangle (Front)

            glVertex3f(-1.0f, 1.0f, 0.0f);			// Top Of Triangle (Right)
            glVertex3f(1.0f, -1.0f, 0.0f);			// Left Of Triangle (Right)
            glVertex3f(1.0f, 1.0f, 0.0f);
void init(void)
  /* Setup cube vertex data. */

  /* Use depth buffering for hidden surface elimination. */
	glDisable( GL_DEPTH_TEST ) ;
	glClearColor( 1.0, 1.0, 1.0, 0.0 ) ; // white
	float mulval = 0.01 ; // you might want to change this

	glEnable( GL_BLEND ) ;
	glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ; // works fine, except cracks
	//glBlendFunc( GL_SRC_ALPHA_SATURATE, GL_ONE ) ; // works only on black background...
	glPolygonMode( GL_FRONT, GL_FILL ) ;
	glEnable( GL_POLYGON_SMOOTH ) ;
int main(int argc, char** argv) {

  // Use a single buffered window in RGB mode (as opposed to a double-buffered
  // window or color-index mode).
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_RGB  |GLUT_DEPTH | GLUT_STENCIL);
  // Position window at (80,80)-(480,380) and give it a title.
  glutInitWindowPosition(80, 80);
  glutInitWindowSize(800, 600);
  glutCreateWindow("A Simple Triangle");

  // Tell GLUT that whenever the main window needs to be repainted that it
  // should call the function display().
  // Tell GLUT to start reading and processing events.  This function
  // never returns; the program only exits when the user closes the main
  // window or kills the process.
  return 0;

and result is:

what is the line between of triangle? i want to remove it!!

You are using GL_TRIANGLES so there vertices must be in multiples of 3. Do you mean to use GL_TRIANGLES_STRIP

I count 6 glVertex3f calls. Looks like a multiple of 3 to me.

Is the attachment working for anybody? It fails to open for me.

I was having a bad day - no I could not open the attachment

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