# 2D animation collision
**URL:** https://discussions.unity.com/t/2d-animation-collision/84932
**Category:** Questions & Answers
**Created:** [October 23, 2013, 7:49pm UTC](https://discussions.unity.com/t/2d-animation-collision/84932 "2013-10-23T19:49:24Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Twinny](https://discussions.unity.com/u/Twinny)
#### Post date: [October 23, 2013, 7:49pm UTC](https://discussions.unity.com/t/2d-animation-collision/84932/1 "2013-10-23T19:49:24Z")
i’ve looked around but i really can’t find an answer this.
lets say i want to make a fighting game, and there is a sprite animation that involves the character extending his arm to punch. My question is: how exactly would i go about making that arm have its separate collider during the animation? I know there are a lot of fancy frameworks out there like 2d toolkit, ex2d, sprite manager, etc but i can’t find any specific info or tutorial that focuses on this type of interaction.
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### Author:  [@DFledermaus](https://discussions.unity.com/u/DFledermaus)
#### Post date: [October 24, 2013, 12:53am UTC](https://discussions.unity.com/t/2d-animation-collision/84932/2 "2013-10-24T00:53:14Z")
You’d do this like any other time you generate a temporary collider, look [here](http://docs.unity3d.com/Documentation/ScriptReference/Physics.html) under anything that ends in “cast” like linecast or capsulecast. You’ll have to match it’s position and size to your animation by hand.
Unless you need an actual collider and not just a trigger, that would be a sub-object that you enable and animate when needed and keep disabled the rest of the time. But for a fighting game you probably don’t need this type.