# Is there a way to manipulate polygon points more precisely on collisions?

**URL:** <https://discourse.mapeditor.org/t/is-there-a-way-to-manipulate-polygon-points-more-precisely-on-collisions/1544>\
**Category:** Questions\
**Created:** [July 24, 2016, 12:54am UTC](https://discourse.mapeditor.org/t/is-there-a-way-to-manipulate-polygon-points-more-precisely-on-collisions/1544 "2016-07-24T00:54:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![linck5](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@linck5](https://discourse.mapeditor.org/u/linck5)\
**Post date:** [July 24, 2016, 12:54am UTC](https://discourse.mapeditor.org/t/is-there-a-way-to-manipulate-polygon-points-more-precisely-on-collisions/1544/1 "2016-07-24T00:54:45Z")

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I know I can hold ctrl to snap polygon points to the corners of the tile, but aside from that, is there any way maybe manually set polygon points values, or snap them to pixels or something? Something that can give me some precision when setting my polygon points.

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**Author:** ![bjorn](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.mapeditor.org/bjorn/32/1599_2.png) [@bjorn](https://discourse.mapeditor.org/u/bjorn)\
**Post date:** [July 25, 2016, 10:57am UTC](https://discourse.mapeditor.org/t/is-there-a-way-to-manipulate-polygon-points-more-precisely-on-collisions/1544/2 "2016-07-25T10:57:17Z")

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In addition to the tile grid, Tiled has a hidden “fine grid”, which can be configured in the preferences by the number of divisions from the tile grid. By default the fine grid divisions are 4, but if you set it to your tile size, you’ll effectively have a way to do pixel-alignment for your polygons (if you’re using square tiles).

To snap the the fine grid, choose _View -\> Snap to Fine Grid_.

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**Author:** ![linck5](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@linck5](https://discourse.mapeditor.org/u/linck5)\
**Post date:** [July 25, 2016, 5:24pm UTC](https://discourse.mapeditor.org/t/is-there-a-way-to-manipulate-polygon-points-more-precisely-on-collisions/1544/3 "2016-07-25T17:24:00Z")

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That works perfectly! I had some trouble with collisions not matching perfectly from tile to tile, that solves the problem. Thanks!