glTranslatef(2.0, 3.0, -1.0);
       glRotatef(45.0, 0.0, 1.0, 0.0);
       glBegin(GL_POLYGON);
	   glVertex3f(0.0, 0.0, 0.0);
	   glVertex3f(1.0, 0.0, 0.0);
	   glVertex3f(0.0, 1.0, 0.0);
       glEnd();