// 八面体のデータ(法線ベクトルを使って隠面消去) [Box2.java] 
 public class Box2 { 
 double [][] x={{ 0,80,40}, {80,80,40}, {80, 0,40},{ 0, 0,40}, 
                {40,80, 0}, {40,80,80}, {40, 0,80},{40, 0,0}}; 
 double [][] y={{85,85,170},{85,85,170},{85,85,170},{85,85,170}, 
                { 0,85,85}, { 0,85,85}, { 0,85,85},{ 0,85,85}}; 
 double [][] z={{80,80,40}, {80, 0,40}, { 0, 0,40},{ 0,80,40}, 
                {40,80,80}, {40, 0,80}, {40, 0, 0},{40,80, 0}}; 
 }//end Box2