# RecastNavMesh disappeared in stream levels **URL:** \ **Category:** World Creation\ **Tags:** sublevel, Navigation, unreal-engine, level, navmesh, question\ **Created:** [April 3, 2019, 12:17am UTC](https://forums.unrealengine.com/t/recastnavmesh-disappeared-in-stream-levels/446491 "2019-04-03T00:17:15Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![anonymous\_user\_19cdb1f4](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_19cdb1f4](https://forums.unrealengine.com/u/anonymous_user_19cdb1f4)\ **Post date:** [April 3, 2019, 12:17am UTC](https://forums.unrealengine.com/t/recastnavmesh-disappeared-in-stream-levels/446491/1 "2019-04-03T00:17:15Z")
Hey everyone! I had this issue in UE4.20, and it might have been resolved in later engine versions, but I wanted to post this resolution just in case anyone is still using this version and had this issue. I didn’t see an answer for this, so if I’m sorry if I’m double posting. The issue started when I set up a series of stream levels and added a nav mesh bounds volume to the persistent level. Unfortunately, one level already had a basic navigation system set up so my recast navmesh in the persistent level disappeared. I’m assuming this was the issue because it did not replicate after I created a new level without a navigation system, but I was never able to fix the original. To resolve this I went into the world settings and disabled the Auto Spawn Missing Nav Data option. It was a pretty simple resolution, but it had me stuck for awhile trying to figure out why I couldn’t get the recast settings back. Hopefully this helps someone! ---
**Author:** ![anonymous\_user\_19cdb1f4](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_19cdb1f4](https://forums.unrealengine.com/u/anonymous_user_19cdb1f4)\ **Post date:** [April 3, 2019, 12:17am UTC](https://forums.unrealengine.com/t/recastnavmesh-disappeared-in-stream-levels/446491/2 "2019-04-03T00:17:58Z")
To resolve this I went into the world settings and disabled the Auto Spawn Missing Nav Data option. It was a pretty simple resolution, but it had me stuck for awhile trying to figure out why I couldn’t get the recast settings back. Hopefully this helps someone! ---
**Author:** ![LittlePiicklee](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@LittlePiicklee](https://forums.unrealengine.com/u/LittlePiicklee)\ **Post date:** [January 30, 2023, 9:16am UTC](https://forums.unrealengine.com/t/recastnavmesh-disappeared-in-stream-levels/446491/3 "2023-01-30T09:16:54Z")
It actually helped me. Thanks a lot. In my case it was not the auto spawn though. It was some kind of a bug. Under the world settings in UE5 I just change the Navigation System Config to Generic one. Then, my navmeshvolume started to detect collisions and showed them as green.