   alpha hull
  Hy.you know a good algorithm for the alpha hull or convex hull?I must connect a list of 2d point that makes a room.All the point are the angles of the room and i would.   
  I search all night on google and i find 2 methods:1)connect a list of point with alpha hull , but i don't fin the algorithm in google or2)identify a path of lines with opencv , is hard?thanks   ;  I search all night on google and i find 2 methods:1)connect a list of point with alpha hull , but i don't fin the algorithm in google or2)identify a path of lines with opencv , is hard?thanks   ;  Is your problem that:* You have a collection of points, and* You want to find a convex hull of these points?If so, tryhttp://www.google.com.au/search?q=convex+hull+decomposition   ;  thanks , but that i 'm search is alpha hull , not convex hull , because i would connect all the point for create a convex shape , a poly.The point must be connected in hourglass sense.Thanks.