Navmesh needs to be rebuilt problem

Development Programming & Scripting AI
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Hi guys, I am having an issue with the Navmesh, it’s perfectly fine until I change any of the settings in the recast nav mesh object and then it stops working completely, even after manually rebuilding the paths in the drop down a ‘Navmesh needs to be rebuilt’ error message pops up and none of my AI objects work at all.

I checked around thinking this is some kind of bug but apparently an issue like this was fixed in 4.8 so I wasn’t sure if I was simply doing something wrong? The only way I can get things working is just using the navmesh as default but I need to be able to change the cell size for my level.

Thanks in advance. :slight_smile:

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Did you ever figure this out? I am having the same issue.

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me too. Anyone figure it out? I’m in 4.22

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Things you want to look at when having problems with your NavMesh:

  • Set Navigation System settings in your Project Settings (make an Agent if one doesn’t exist)
  • Set Navigation Mesh settings in Project Settings
  • Ensure RecastNavMesh object in your level matches these settings
  • Ensure CharacterMovement components match those settings
  • Try moving the NavMesh Bounds Volume around
  • Or, Selecting everything in the level and moving it around has also fixed problems for me.
1 Like
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Got mine working by deleting the RecastNavMesh object, then tuning my Navigation Mesh project settings and building paths.

One thing that has also broken teleportation is being inside a collision mesh. Built a room mesh and the automatic collision bounds filled the whole room breaking the teleportation.

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For what it’s worth, here’s a video of creating a brand new map, dropping a nav mesh bounds volume, recast nav mesh spawning, and yet when I PIE, our friendly error comes up again.

https://youtu.be/IKnk8o_tQ1o

I have NavigationSystem in my build CS file, because I need access to GetQueryFilter. I need the path before moving along it, so I can show a preview. I arrived at something very similar to this post Click To Move in Unreal – Snorri Sturluson – Veteran game developer (Arctic Theory, CCP, EA, Atari Games).

I have wracked my brain on this and can only imagine that including this module in my project is somehow interfering with the way RecastNavMesh works in the Editor, and not my project files.