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UE4 Fatal Error DetourNavMesh.cpp

I compiled UE4.19.2 it was working fine but now when I drag a NavMeshBound Volume or open a map with navmesh it crashes at the following line: I recompiled engine again but nothing solved.

alt text

Product Version: UE 4.19
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ue4navmeshbug.jpg (409.7 kB)
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asked Jul 16 '18 at 06:21 AM in Bug Reports

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UPO33
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avatar image Jeff A ♦♦ STAFF Jul 16 '18 at 04:44 PM

Hello,

We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://epicsupport.force.com/unrealengine/s/

Thanks

avatar image Uno1982 Aug 11 '18 at 04:43 AM

I'm having this issue too. I've submitted the bug report. I'm working with epic on Case # 00033678: Update project from 4.18.3 to 4.19.2 crashing onmap load with nav mesh has been received.

I'm stripping a clone of my project down mesh by mesh to try and narrow down what may be causing the issue.

Just out of curiosity are you using landscapes? does the landscape have visibility mask (hole) painted?

![alt text][1]

avatar image Uno1982 Aug 11 '18 at 05:06 AM

![alt text][1]

I'm pretty sure I've found a way to reproduce and remove the issue. So it appears that if there is a place that the nav mesh intersects a hole. (walkable area drawn into mask area) When I remove this from my project I don't get the crashes when loading into the map. Either that or they are so less often launching 20 times still didn't produce it. Otherwise I crash 1/6 times on average.

navmeshissue.png (1.0 MB)
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3 answers: sort voted first

Never mind it still crashes just less often. Something is still going on with 4.19.2 dynamic navigation I’ve submitted my project and minidump case 00033678

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answered Aug 11 '18 at 05:39 PM

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Uno1982
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The issue is with the sedan template vehicle within the Nav Mesh bound on map load. An additional issue is making sure your vs 2017 is up to date as the older compiler generated the wrong binary for the Nav recast

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answered Aug 12 '18 at 05:01 AM

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Uno1982
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someone in Unreal discord helped me to solve this bug. I don't know its because of UE4 or compiler. just update your visual studio to 15.7.+ and UE4.20

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answered Aug 13 '18 at 03:34 PM

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UPO33
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