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4.14 Broke Collisions

Upon upgrading our project from 4.12 to 4.14, most collisions have suddenly broken into a very messy situation.

I have attached images of a sample of a very small portion of the issues but this is spread out over the entire project.

Things I already tried with no success:

  • reimport

  • import a fresh object and override existing

  • reexport and then reimport

  • import fresh mesh into new folder

  • import fresh mesh into blank empty 4.14 project (broken)

  • tested a fresh import into a blank 4.12 project (working as expected)

  • tried one convex hull on versus off

  • made a fresh empty 4.14 project and migrated all the content into it (versus letting the project upgrade)

Nothing has worked so far. I did look around hoping for a solution but didn't see anything in the search yet. I am hoping there is some easy setting that was missed and will set it back to normal.

They are being imported already without "one convex hull."

Thanks for reading.

Product Version: UE 4.14
412.png (55.2 kB)
414.png (73.3 kB)
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asked Jan 13 '17 at 04:25 PM in Bug Reports

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avatar image Kitty Jan 13 '17 at 04:49 PM

I had another thought and just did one more test and it appears that thickening the custom collision boxes before exporting may be a solution.

This was the second test and it worked on with a thickness in between those two on the first test as well.

I will come back if this doesn't pan out.

Still though, if anyone knows of something easier we would still love to know since this will require altering (almost) every mesh. :)

avatar image Ed Burgess ♦♦ STAFF Jan 16 '17 at 03:18 PM

Hi Kitty,

I'd like to reproduce this issue as it may be a bug with the engine. Would you mind provide a sample FBX that reproduces the issue.

It can be anything like a wall for example just as long as the collision is confirmed to break by upgrading to 4.14



avatar image Kitty Jan 18 '17 at 10:28 PM

Sure thing. I have two samples, both are pretty basic but one is nothing but a rectangle collision. The broken mesh have no pattern as they vary from a little complicated to nothing more than a cube needed for collisions.

I do want to point out I checked the 4.15 preview yesterday and sampled these mesh and a bunch of others and the collision shape issues are gone and they are all back to the expected outcome. However, there is a flickering issue (in both 4.14 and 4.15 preview) that happens constantly as well. I've included a tiny sample of the flickering too.

Thanks for the help.


Edited (wall 1 wasn't the right version):



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Hey Kitty,

I'm glad the issue has been resolved in a later engine version. When I imported the mesh the collision mesh was altered but did seem to work.

Regarding the flickering that is usually related to mesh bounds scale. The flickering is the game engine trying to cull the asset because it thinks that it is currently off screen. Try increasing the bounds scale in the details panel to see if that helps.

I didn't notice any flickering when I imported the two assets provided but my suggestion is still worth a try.

Let me know if that helps!


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answered Jan 20 '17 at 09:48 PM

avatar image Kitty Feb 17 '17 at 04:29 AM

Just tested the bounds scale in both 4.14 and 4.15 (now the full version) and it did stop the flickering.

Thanks for all the help. :)

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