# Animation Blend Per Bool Issue - Weird Pop or Jump or something..

**URL:** <https://forums.unrealengine.com/t/animation-blend-per-bool-issue-weird-pop-or-jump-or-something/37345>\
**Category:** Character & Animation\
**Tags:** unreal-engine\
**Created:** [August 2, 2015, 10:42am UTC](https://forums.unrealengine.com/t/animation-blend-per-bool-issue-weird-pop-or-jump-or-something/37345 "2015-08-02T10:42:57Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![FrankieV](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@FrankieV](https://forums.unrealengine.com/u/FrankieV)\
**Post date:** [August 2, 2015, 8:21pm UTC](https://forums.unrealengine.com/t/animation-blend-per-bool-issue-weird-pop-or-jump-or-something/37345/3 "2015-08-02T20:21:45Z")

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IK bones are not active by default and are generally used as targets when content points must be maintained.

UE4 does interpolate by default and can cause the kind of effect depending on the key type being either Bezier or linear. As in the video example I don’t think that’s the fundamental problem your having.

Your basic player model, as in always has been and always will be, is broken down into two basic components as a requirement of having legs move and the torso being responsible for action states (as in aiming, reloading stuff) and needs to be layered so the legs are responsible for locomotion while the torso is allowed to preform an action state while moving.

Start here

> **[Blend Nodes](https://docs.unrealengine.com/4.27/en-US/AnimatingObjects/SkeletalMeshAnimation/NodeReference/Blend/)**
>
> Animation nodes that blend multiple animations together based on a set of criteria.

Layered Bland Per Bone is what you are looking for.

Zak’s basic animation tutorial has a set up for punching that demonstrates use.

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>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — ue4community.wiki! You will be able to find content from the official...

Layer your handgun pose on top of the idle state will not only fix the problem but also change the action state even if the player is running.

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