# Line Direction of closed boundaries **URL:** \ **Category:** Geometry\ **Tags:** python, vector\ **Created:** [December 12, 2016, 6:16pm UTC](https://forum.dynamobim.com/t/line-direction-of-closed-boundaries/8188 "2016-12-12T18:16:28Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Cesar\_Escalante2](https://avatars.discourse-cdn.com/v4/letter/c/c57346/32.png) [@Cesar\_Escalante2](https://forum.dynamobim.com/u/Cesar_Escalante2)\ **Post date:** [December 12, 2016, 6:16pm UTC](https://forum.dynamobim.com/t/line-direction-of-closed-boundaries/8188/1 "2016-12-12T18:16:28Z")
Given a closed chain of boundary lines in the same plane, each line displaying different vector line directions, is there a way to change all the lines’ vector direction so they all read as a chain of vectors in counterclockwise direction? I found a graphic way to do this but it is really cumbersome: 1) convert the closed boundaries into a surface by patch, then 2) find the face vertices, 3) convert the vertices to point, 4) build a polycurve by points, 5) deconstruct the polycurve to lines, 6) and then find the line direction. Any other suggestion? ---
**Author:** ![Thomas\_Mahon](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/thomas_mahon/32/64209_2.png) [@Thomas\_Mahon](https://forum.dynamobim.com/u/Thomas_Mahon)\ **Post date:** [December 12, 2016, 6:20pm UTC](https://forum.dynamobim.com/t/line-direction-of-closed-boundaries/8188/2 "2016-12-12T18:20:42Z")
Create a `PolyCurve.ByJoinedCurves`, then retrieve its curves using `PolyCurve.Curves`. This new list of lines should have a consistent/reliable vector direction. ---
**Author:** ![Cesar\_Escalante2](https://avatars.discourse-cdn.com/v4/letter/c/c57346/32.png) [@Cesar\_Escalante2](https://forum.dynamobim.com/u/Cesar_Escalante2)\ **Post date:** [December 12, 2016, 7:19pm UTC](https://forum.dynamobim.com/t/line-direction-of-closed-boundaries/8188/3 "2016-12-12T19:19:35Z")
Thanks Thomas