I am not getting anything when i use
gluOrtho2D(0.0,250.0,0.0,250.0);
glBegin (GL_QUADS);
glVertex3f(150.0f,10.0f, 0.0f);
glVertex3f(150.0f,100.0f, 0.0f);
glVertex3f(150.0f,100.0f, 0.0f);
glVertex3f(150.0f,10.0f, 0.0f);
but I do get rectangle when i use
gluOrtho2D(0.0,250.0,0.0,250.0);
glRectf(100.0f,150.0f,150.0f,0.0f);
what can be the problem
Thanks