  2
   ,        2;      .

ϳ:
-     <>,                 2.         .
-          2,        2,       .         . 
-          2,        2,    <Ctrl> + <1>  .         . 
-          2,       .
-          2,   <1>  .
-               ,       .          .   
-        '    2D  3D    <>   .              2D/3D  .  
-       <>    .