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Navigation randomly skips HISM instances

After https://issues.unrealengine.com/issue/UE-48309 was fixed, I still have trouble with HISM.

The navigation considered HISM instances fine in UE 4.16.3, but is completely broken for my project in UE 4.17.1.

A line of dynamically spawned instances looks like this in 4.16.3 (with console command "show Navigation" and dynamic navigation enabled):

Navigation 4.16.3

The same level in 4.17.1 looks like this: alt text

As you see, it randomly connects instances, even though all instances have the same BP class. Is this a known bug? Do I need to wait for 4.18 to use dynamically created HISM again?

Edit: All instances have the same Z position, so the reason cannot be one instance being smaller/above ground/whatever. Also, the result stays the same if I adjust the Z value. HISM also has "can character step on it" set to false.

Product Version: UE 4.17
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asked Aug 16 '17 at 07:50 PM in Bug Reports

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avatar image lotodore Aug 16 '17 at 09:25 PM

I deleted everything from my game project in order to provide a minimal project to reproduce the issue. See the attached zip file. minimal project

If you open this project with UE 4.17.1, run the game, fly around a bit for top down view, and "show Navigation" in the console, it will show the following picture:

navigation bug

Also note that I keep getting "save failed" errors with this simple map in 4.17.1, maybe this is related.

avatar image Michel.Dupuis STAFF Aug 29 '17 at 11:57 AM


I'm currently looking at your issue, and hopefully it will make it in 4.17.2, will let you know.

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A fix was made and will be available for 4.17.2

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answered Aug 30 '17 at 06:24 PM

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Michel.Dupuis STAFF
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avatar image lotodore Aug 31 '17 at 10:02 PM

This is great news, thank you very much.

avatar image lotodore Sep 26 '17 at 06:04 PM

I had to skip 4.17 due to https://issues.unrealengine.com/issue/UE-48361 I just tested using 4.18 preview 2 and navigation is still broken with HISM instances for my project. The above minimal project works fine, however, so I'm afraid I have no small project to reproduce. Is this still a known issue in 4.18? I somehow fear I'll be stuck with 4.16 forever or required to use individual actors. This screenshot is from 4.18 preview 2: alt text

avatar image Michel.Dupuis STAFF Sep 26 '17 at 06:36 PM

Well technically, the bug was fixed ans submitted in 4.17.2, i'll check to be sure i bring the change back for 4.18 and will let you know.

avatar image Michel.Dupuis STAFF Sep 26 '17 at 06:49 PM

So i confirm it was bring back, but i checked in yesterday, so it will be available in the next preview of 4.18 i guess.

avatar image lotodore Oct 04 '17 at 08:31 PM

Thanks, the navigation is fixed for me in 4.18 preview 3!

However, HISM is still broken for me compared to 4.16.3 - please see bug report https://answers.unrealengine.com/questions/712662/multiboxtraceforobjects-sometimes-returns-the-same.html . I guess I just use HISM for too much stuff :-(. So far I failed to reproduce this in a small project, if you need this I will try this weekend.

avatar image Michel.Dupuis STAFF Oct 05 '17 at 11:16 AM

Glad to hear your issue is fixed, however for the other one, yes i would need a good repro or ideally a test project to properly investigate what is happening.


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