//
//		Set up the global ambient color
//

      GLfloat array[4] ;

      array[0] = 0.3 ;
      array[1] = 0.3 ;
      array[2] = 0.3 ;
      array[3] = 1.0 ;

      glLightModelfv ( GL_LIGHT_MODEL_AMBIENT, array ) ;

//
//		Set up global light source parameters
//

      glLightModeli  ( GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE ) ;
      glLightModeli  ( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE ) ;


//     
//    Execute the GL commands for your light source here
//
//	e.g.
//    
//    my_light.GL() ;
//

//
//		Enable lighting, especially light source zero.
//
      glEnable ( GL_LIGHTING ) ;
      glEnable ( GL_LIGHT0 ) ;
      glEnable ( GL_NORMALIZE ) ;