Collapse Faces UI


        
     quake map    ,    
 Collision Mesh,     .
   -     ()   Object  Ctrl+J.
   Object Mode,   -    collapse, 
 Collapse Faces.
,       - .
  Object Mode  A (  ) Ctrl+J,    .
   Edit Mode   Merge > Remove Doubles   
 ,         .


 ,        , 
      Tools > Edit,      
 . 