glEnable (GL_DEPTH_TEST);
    glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
    glColor3f (1.0, 1.0, 1.0);
    \*  Invoke the object-description routine.  */

    glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
    glEnable (GL_POLYGON_OFFSET_FILL);
    glPolygonOffset (1.0, 1.0);
    glColor3f (0.0, 0.0, 0.0);
    \*  Invoke the object-description routine again.  */

    glDisable (GL_POLYGON_OFFSET_FILL);