# Colliders and reimporting

**URL:** <https://discourse.mapeditor.org/t/colliders-and-reimporting/1474>\
**Category:** Questions\
**Created:** [June 17, 2016, 12:46am UTC](https://discourse.mapeditor.org/t/colliders-and-reimporting/1474 "2016-06-17T00:46:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Brandon\_Carter](https://avatars.discourse-cdn.com/v4/letter/b/dfb087/32.png) [@Brandon\_Carter](https://discourse.mapeditor.org/u/Brandon_Carter)\
**Post date:** [June 17, 2016, 12:46am UTC](https://discourse.mapeditor.org/t/colliders-and-reimporting/1474/1 "2016-06-17T00:46:41Z")

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this is most likely a unity thing but if i go back into tiled and redo a few things like erase a block when unity updates it the graphics change but the collisions are still there for the tile i erased i can delete the prefab from the scene and re drag it back in but it then becomes hard to reposition the whole map anyone know how i can make unity update the collisions?

thanks

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**Author:** ![Seanba](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.mapeditor.org/seanba/32/1531_2.png) [@Seanba](https://discourse.mapeditor.org/u/Seanba)\
**Post date:** [June 17, 2016, 10:43pm UTC](https://discourse.mapeditor.org/t/colliders-and-reimporting/1474/2 "2016-06-17T22:43:21Z")

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Are you using Tiled2Unity?

If you are editing your prefabs by hand after export then parts of the prefab may not be properly updated on the next update.

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**Author:** ![Brandon\_Carter](https://avatars.discourse-cdn.com/v4/letter/b/dfb087/32.png) [@Brandon\_Carter](https://discourse.mapeditor.org/u/Brandon_Carter)\
**Post date:** [June 18, 2016, 1:24am UTC](https://discourse.mapeditor.org/t/colliders-and-reimporting/1474/3 "2016-06-18T01:24:07Z")

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yes im using tiled to unity and unity reloads the graphic changes fine but not the collisions

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**Author:** ![Seanba](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.mapeditor.org/seanba/32/1531_2.png) [@Seanba](https://discourse.mapeditor.org/u/Seanba)\
**Post date:** [June 21, 2016, 2:52pm UTC](https://discourse.mapeditor.org/t/colliders-and-reimporting/1474/4 "2016-06-21T14:52:55Z")

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Have you made changes to the prefab instance by hand in Unity? You may need to revert those edits before you see more recent changes that were made to the referenced prefab.