# Complex collision shape in tile sources

**URL:** <https://forum.defold.com/t/complex-collision-shape-in-tile-sources/2567>\
**Category:** Questions\
**Created:** [August 5, 2016, 2:29pm UTC](https://forum.defold.com/t/complex-collision-shape-in-tile-sources/2567 "2016-08-05T14:29:43Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ArmandCloud](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/armandcloud/32/1638_2.png) [@ArmandCloud](https://forum.defold.com/u/ArmandCloud)\
**Post date:** [August 5, 2016, 3:01pm UTC](https://forum.defold.com/t/complex-collision-shape-in-tile-sources/2567/2 "2016-08-05T15:01:04Z")

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Hello @spyromus ,

I experienced this one before, here my insights ;

Documentation says :

> The editor will automatically generate **a convex shape** around each tile, taking into account pixels that are not 100% transparent:

Here is what is [Convex wiki.](https://en.wikipedia.org/wiki/Convex_set)

A post about this situation.

> [@Does defold support only three shapes for collision? (SOLVED)](https://forum.defold.com/t/does-defold-support-only-three-shapes-for-collision-solved/1985/12):
>
> Hello @sicher I used that method. But i didn’t satisfied with the result. Maybe it works with little tiles, didn’t try it. [image] I think i will stick with default colliders for now. [image] Best Regards,

Here is how engine treated 2 different shapes with using shapes alpha.

 ![](https://forum-defold.b-cdn.net/uploads/default/original/2X/1/1952ad7071e38d96114cafcd1d24b78d063b7a04.png)

\*\* Concave Left , Convex right

Best Regards,

PS : if there is another info that i didn’t see yet, feel free to flag this post.

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