  8
   ,        8;      .

:
-     <>,                  8.         .
-          8,        8,       .         . 
-          8,        8,    <Ctrl> + <8>  .         . 
-          8,       .
-          8,   <8>  .
-               ,       .          .    
-            2D  3D    <>   .               2D/3D  .   
-       <>    .