  3
   ,        3;      .

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