Physics actor clipping through movable actors

Development World Creation
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1

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

Project you can download here: 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.

2

Thanks for looking into it.

3

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.

4

Sounds good, thanks for looking into it, I’ll try asking for a workaround on the forums.

5

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

6

Awesome, big thanks!