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inconsistent collision responses from capsules


I upgraded to UE4.8 recently and I have this really odd bug.

I made an actor, which consists of a physics asset (rope), in the construction script of this actor, I attach collision capsules to the different bones, attach them to the bones and set collision response to all channels to Overlap.

This worked fine in 4.7, but now even if I set the response to overlap or ignore, the capsules always block my character from moving through them.. And the really strange thing is that in my 2nd level, where I use this actor I dont have these problems. It just happens in one level.

Is this a known issue?

Product Version: UE 4.8
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asked Jun 14 '15 at 05:17 PM in Bug Reports

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avatar image bluefalcon Jun 15 '15 at 02:23 AM

I am having similar problems with Skeletal Mesh Physics Body collision in 4.8. I had no problems in 4.7, but now it seems that collision only registers less than half the time.

avatar image Adam Davis STAFF Jun 15 '15 at 05:42 PM

Hi dj_joey,

Can you send me a stripped down project that displays this behavior along with instructions of how to reproduce it? I'll be happy to take a look.

avatar image byteparrot Jun 15 '15 at 05:46 PM

Ok I'll do that tomorrow. How can I send you the project?

avatar image Adam Davis STAFF Jun 15 '15 at 05:55 PM

If you load it to a .zip you can upload the .zip here. If the file is too large upload it to a trusted FTP service such as dropbox and you can either post the link here or, if privacy is a concern you can private message me the link on the forums (same username) and I'll pull the information from there.

avatar image byteparrot Jun 15 '15 at 09:27 PM

Hey Adam. I had some time while watching the EA press conf to strip down my project. I've sent you the project per pn. I hope this helps. Tell me if you need something else.

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Hi dj_joey,

I was able to reproduce this and have entered a bug report, UE-17121 to be assessed by the development staff. It appears that the PhysicsBody collision channel can be set to overlap to workaround this error for now.

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answered Jun 16 '15 at 02:35 PM

avatar image byteparrot Jun 18 '15 at 11:39 AM

Hey Adam, did you also notice in the project that the overlap and endoverlap events are triggering too often? I mean not just once when entering / leaving the capsule. Is this another bug / the same bug or is this by design? I don't see this behaviour in 4.7.

avatar image Adam Davis STAFF Jun 19 '15 at 04:39 PM

Hi dj_joey,

There is a known issue with physics objects and multiple overlaps, listed as UE-12386 in our system.

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