Black screen

Hello,

i am new at Open GL and dont know where’s the problem.
I see alsways a black screen. Here is my code (C++):

My System: Virtual Box with Ubuntu inside.

#include <ctype.h>
#include <GL/gl.h>
#include <GL/glut.h>
#include <GL/glx.h>

void display (void) 
{
	glClearColor (0.0, 0.0, 0.0, 0.0);
	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
  glLoadIdentity;
  glTranslatef(-1.5, 0,-6);

glBegin(GL_TRIANGLES);
  glVertex3f(-1,-1, 0);  
  glVertex3f( 1,-1, 0);
  glVertex3f( 0, 1, 0);
glEnd;

  glutSwapBuffers();
}

void keyboard (unsigned char key, int x, int y) 
{
	if(tolower(key)=='q') exit(0);
}

int main (int argc, char **argv) 
{ 
  Display *dpy;
  int major, minor;
  dpy = XOpenDisplay(NULL);
  glXQueryVersion(dpy, &major, &minor);

  glutInit(&argc, argv);
	glutInitWindowSize(512,512);
  glutInitDisplayMode(GLUT_RGB|GLUT_ALPHA|GLUT_DEPTH |GLUT_DOUBLE);
  glutCreateWindow("Beispiel: Fenster");
  glutDisplayFunc(display);
	glutKeyboardFunc(keyboard);
  glutMainLoop();

	return 0;
}

Thanks for help.

I’m starting with opengl also, but i would try sending some color to each vertex
glBegin(GL_TRIANGLES);
glColor3f(1,1,1);
glVertex3f(-1,-1, 0);
glColor3f(1,1,1);
glVertex3f( 1,-1, 0);
glColor3f(1,1,1);
glVertex3f( 0, 1, 0);
glEnd;
Also, maybe the viewport is wrong setted.
Try replacing glTranslatef(-1.5, 0,-6); with glTranslatef(0.0, 0,-6); too.
Also you should specify the normal facing to the camera, otherwise if back face culling is enabled you wont see anything.

Hi,

the solution with the colors and glTranslate dont help.
At the moment i dont have manually set the viewport. The whole code is above.