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Collision does not update with enabled physics simulation.

Sorry for my English. I hope my problem will be clear. Look at video https://www.youtube.com/watch?v=YzUqSsNSpPY.

I created pawn that contains a few static meshes. I added some control for elements(meshes) of my pawn using AddLocalOffset and AddLocalRotation.

Collision of pawn meshes updates correctly when physics is disabled so i can push any other object on scene using tank's gun for example.

But collision of pawn meshes does not update when physics simulation enabled for my pawn. I cant push object on scene using tank's gun(with updated position). But i can push object using "invisible" and not updated gun`s collision. I used "Show Collision" command in game console and it show that collision updates correctly.

Zip archive with my project: https://www.dropbox.com/s/gpq9fu4g8uyy9gu/Tanks.zip?dl=0

Product Version: UE 4.8
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asked Aug 01 '15 at 11:52 AM in Bug Reports

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avatar image TJ V ♦♦ STAFF Aug 03 '15 at 04:56 PM

Hi LaRusCat,

I'm not exactly sure why that isn't working for you. If the 'Gun' component is moved down to the same level as the 'Turret' in the Component Hierarchy, it works correctly. However, when it is attached to the 'Turret' it doesn't collide. I tested this in a new project and it does work correctly.

Could you try recreating your setup in a new project and/or migrating your tank to a new project? Let me know how that goes.

avatar image LaRusCat Aug 04 '15 at 07:41 PM

TJ Ballard ♦♦

I created new project and implemented gun and body rotation. And collision still does not work correct(not updates) when physics simulation enabled for root component(see https://youtu.be/xHvTjXuCh8M ). There is still invisible Gun collision on default position of gun. You can see interaction with invisible gun collision when tank body rotates. I enabled collision for Gun component and collision works well for this component but it "demolish" tank model. Could you please share you project(or/and video with demo) with me? Possible i am doing something wrong.

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Hi LaRusCat,

I'm sorry for the delay. I was mistaken, after further testing I was able to reproduce the issue you described. I have created JIRA UE-19917 and the developers will be investigating further. We will post here with updates as we have them.

As for a workaround, I currently don't have one that allows the tank to maintain simulating physics.



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answered Aug 11 '15 at 06:47 PM

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avatar image LaRusCat Sep 04 '15 at 01:47 PM

Hi, TJ.

Any updates?

avatar image TJ V ♦♦ STAFF Sep 04 '15 at 05:43 PM

This is still being looked into but it's current status is backlogged since we are concentrating on crash and show stopping bugs at the moment. That is pretty common right up to and after an engine release.

avatar image LaRusCat Sep 04 '15 at 08:11 PM

Ok. Thanks!

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