> t = db.geo_polygon5;
test.geo_polygon5
> t.drop();
true
>
> t.insert(

{loc:[0,0]}

)
> t.insert(

{loc:[1,0]}

)
> t.insert(

{loc:[2,0]}

)
> t.insert(

{loc:[3,0]}

)
> t.insert(

{loc:[4,0]}

)
>
> t.ensureIndex(

{ loc : "2d" }

);
>
> t.find( { loc: { "$within":

{ "$polygon" : [[0,0], [2,0], [4,0]] }

}} )

{ "_id" : ObjectId("4e5d35916c2fa14a9f1ae299"), "loc" : [ 1, 0 ] } { "_id" : ObjectId("4e5d35916c2fa14a9f1ae298"), "loc" : [ 0, 0 ] } { "_id" : ObjectId("4e5d35916c2fa14a9f1ae29b"), "loc" : [ 3, 0 ] } { "_id" : ObjectId("4e5d35916c2fa14a9f1ae29a"), "loc" : [ 2, 0 ] }

The point [4,0] is left out of the results.