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glLoadIdentity();
gluLookAt(0, -10, 0, 0, 0, 0, 0, 0, 1);
glOrtho(-3, 3, -3, 3, -3, 3);
glColor3f(0.0, 0.0, 0.0);
glBegin(GL_LINES);
glVertex3f(0, 0, 0);
glVertex3f(0, 0, 10);
glEnd();
glBegin(GL_LINES);
glVertex3f(-1, 0, 8);
glVertex3f(1, 0, 8);
glEnd();