# Physics actor clipping through movable actors **URL:** \ **Category:** World Creation\ **Tags:** bug, clipping, movable, unreal-engine, Physics, static, question\ **Created:** [July 19, 2016, 1:04am UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440 "2016-07-19T01:04:54Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![CyanBalloon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@CyanBalloon](https://forums.unrealengine.com/u/CyanBalloon)\ **Post date:** [July 19, 2016, 1:04am UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/1 "2016-07-19T01:04:54Z")
Hi there, I’d like to report a bug that have been really bothering us for quite a while concerning the enabling or disabling or physic simulation. Fixing this bug would save us a lot of torment. Let’s start by showing the behavior in a template project: [https://ppotn40-hotmail.tinytake.com/sf/ODM2MzgwXzM2NjQ2NTQ](https://ppotn40-hotmail.tinytake.com/sf/ODM2MzgwXzM2NjQ2NTQ) Project you can download here: [https://drive.google.com/file/d/0B0t\_2fINrHDHYUNHNVNXWjFMTjQ/view?usp=sharing](https://drive.google.com/file/d/0B0t_2fINrHDHYUNHNVNXWjFMTjQ/view?usp=sharing) Basically, what this project does is enable simulate physics on the black cube in the middle, then disables it once it safely landed on the bottom cube. After that, it enables physics on the top cube, and once the top cube is near the black cube, it re-enables the black cube’s physics. As you can see, if the black cube gets his physics re-enabled on a **movable actor** (on the right), it just clips through it. If the black cube gets his physics re-enabled on a **static actor** (on the left), its behavior is clean, it stays on the object. This behavior is a big problem for us, as we need to load/unload streaming levels on which physics object from the persistent level is supposed to be standing on. The thing is, when we re-enable the physics simulation, all our objects just clips through the floor and fall into nothingness. I don’t imagine it’s a _wanted_ behavior, could this be added to the bug’s list to solve? That would be amazing. Thanks. ---
**Author:** ![CyanBalloon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@CyanBalloon](https://forums.unrealengine.com/u/CyanBalloon)\ **Post date:** [July 19, 2016, 7:09pm UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/2 "2016-07-19T19:09:53Z")
Thanks for looking into it. ---
**Author:** ![TJ\_V](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/tj_v/32/1008648_2.png) [@TJ\_V](https://forums.unrealengine.com/u/TJ_V)\ **Post date:** [July 19, 2016, 7:39pm UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/3 "2016-07-19T19:39:29Z")
Hi CyanBalloon, I’m going to be investigating this to see if this is a bug. If I run across a workaround I will post it here. With that said, it could be worth posting on the forums specifically asking for a workaround. Just make sure to post a link to this AnswerHub post and mention that we are already looking into the bug. ---
**Author:** ![CyanBalloon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@CyanBalloon](https://forums.unrealengine.com/u/CyanBalloon)\ **Post date:** [July 19, 2016, 8:31pm UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/4 "2016-07-19T20:31:10Z")
Sounds good, thanks for looking into it, I’ll try asking for a workaround on the forums. ---
**Author:** ![TJ\_V](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/tj_v/32/1008648_2.png) [@TJ\_V](https://forums.unrealengine.com/u/TJ_V)\ **Post date:** [July 20, 2016, 7:55pm UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/5 "2016-07-20T19:55:21Z")
After looking into this, I’ve created JIRA UE-33589. Our developers will be investigating further and we will post here with updates as we have them. Cheers, TJ ---
**Author:** ![CyanBalloon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@CyanBalloon](https://forums.unrealengine.com/u/CyanBalloon)\ **Post date:** [July 21, 2016, 6:10pm UTC](https://forums.unrealengine.com/t/physics-actor-clipping-through-movable-actors/364440/6 "2016-07-21T18:10:04Z")
Awesome, big thanks!