# \#navmesh-bug **URL:** https://forums.unrealengine.com/tag/navmesh-bug/5182.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Unreal Engine 5.5 Dynamic Nav Mesh Not generating Instanced Static Meshes Spawned using Construction Script](https://forums.unrealengine.com/t/unreal-engine-5-5-dynamic-nav-mesh-not-generating-instanced-static-meshes-spawned-using-construction-script/2410014)
**Author:** [@Dazzling\_Divine](https://forums.unrealengine.com/u/Dazzling_Divine)\ **Replies:** 5\ **Last updated:** [January 16, 2026, 6:28am UTC](https://forums.unrealengine.com/t/unreal-engine-5-5-dynamic-nav-mesh-not-generating-instanced-static-meshes-spawned-using-construction-script/2410014 "2026-01-16T06:28:06Z")
In Unreal Engine 5.5 Dynamic Nav Mesh not generating on Instanced Static Meshes Spawned using Construction Script. Nav Mesh generates if I move the blueprint actor. But when I re-open the level nav mesh is gone again. P… --- ## [UE-243852 I'm facing the same issue in 5.5 with a full Dynamic Navmesh even after importing the "Fix" to this CL](https://forums.unrealengine.com/t/ue-243852-im-facing-the-same-issue-in-5-5-with-a-full-dynamic-navmesh-even-after-importing-the-fix-to-this-cl/2663105)
**Author:** [@Glytz](https://forums.unrealengine.com/u/Glytz)\ **Replies:** 0\ **Last updated:** [October 7, 2025, 7:11pm UTC](https://forums.unrealengine.com/t/ue-243852-im-facing-the-same-issue-in-5-5-with-a-full-dynamic-navmesh-even-after-importing-the-fix-to-this-cl/2663105 "2025-10-07T19:11:00Z")
Hello as the title said, we are currently facing the same issue as described by this bug UE-243852 where some layers will not load properly, but we are using a fully dynamic navmesh inside our world. Was the bug tested … --- ## [NavModifier Component is not updating on destroy](https://forums.unrealengine.com/t/navmodifier-component-is-not-updating-on-destroy/354203)
**Author:** [@Chartas](https://forums.unrealengine.com/u/Chartas)\ **Replies:** 8\ **Last updated:** [August 17, 2025, 1:20pm UTC](https://forums.unrealengine.com/t/navmodifier-component-is-not-updating-on-destroy/354203 "2025-08-17T13:20:12Z")
Build Type: Binary Build Build version: Version: 4.11.1-2934540+++UE4+Release-4.11 Detailed description of the issue: If you create an Actor containing a NavModifer Component, even if you destroy the actor the effec… --- ## [Navmesh generating under ground ?!](https://forums.unrealengine.com/t/navmesh-generating-under-ground/483307)
**Author:** [@Jau\_Studio](https://forums.unrealengine.com/u/Jau_Studio)\ **Replies:** 3\ **Last updated:** [July 1, 2025, 7:13am UTC](https://forums.unrealengine.com/t/navmesh-generating-under-ground/483307 "2025-07-01T07:13:05Z")
Could it be that the ground mesh is bigger/smaller than the collision of the ground? --- ## [Serious navmesh generation bug since 5.4 ](https://forums.unrealengine.com/t/serious-navmesh-generation-bug-since-5-4/2531523)
**Author:** [@Yangzhou945](https://forums.unrealengine.com/u/Yangzhou945)\ **Replies:** 0\ **Last updated:** [May 28, 2025, 2:34pm UTC](https://forums.unrealengine.com/t/serious-navmesh-generation-bug-since-5-4/2531523 "2025-05-28T14:34:25Z")
2025-05-28 12-56-44.mkv (19.8 MB) Serious navmesh generation bug since 5.4 Old Collision would not be cleared when move collision in level. Create a new actor blueprint and set collision to navmesh Put a instance of … --- ## [Detour Crowd does not work with Nav Links](https://forums.unrealengine.com/t/detour-crowd-does-not-work-with-nav-links/1259460)
**Author:** [@unreal\_hl](https://forums.unrealengine.com/u/unreal_hl)\ **Replies:** 1\ **Last updated:** [March 3, 2025, 2:35am UTC](https://forums.unrealengine.com/t/detour-crowd-does-not-work-with-nav-links/1259460 "2025-03-03T02:35:36Z")
I have two nav planes with different height, connected with one nav link (see picture below). I have several pawns with FloatingPawnMovementComponent. If I use AIController for all the pawns, they can “climb up” the nav… --- ## [Navmesh needs to be rebuilt problem](https://forums.unrealengine.com/t/navmesh-needs-to-be-rebuilt-problem/349945)
**Author:** [@JBroderick](https://forums.unrealengine.com/u/JBroderick)\ **Replies:** 4\ **Last updated:** [December 7, 2019, 3:25pm UTC](https://forums.unrealengine.com/t/navmesh-needs-to-be-rebuilt-problem/349945 "2019-12-07T15:25:17Z")
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 d… --- ## [\[UE\_4.4\]\[AI + Navmesh\] Using NavLinkProxy's smart and simple links - only simple seems to work?](https://forums.unrealengine.com/t/ue-4-4-ai-navmesh-using-navlinkproxys-smart-and-simple-links-only-simple-seems-to-work/292588)
**Author:** [@anonymous\_user\_cf025a94](https://forums.unrealengine.com/u/anonymous_user_cf025a94)\ **Replies:** 5\ **Last updated:** [January 13, 2025, 10:56am UTC](https://forums.unrealengine.com/t/ue-4-4-ai-navmesh-using-navlinkproxys-smart-and-simple-links-only-simple-seems-to-work/292588 "2025-01-13T10:56:50Z")
Hi, I’m experiencing problems while trying to use smart links in AI navigation. In my understanding Smart links are used for cases when you want to enable/disable them, opening up temp paths for AI to use, and turning … --- ## [5.3.2 Navmesh doesn't build properly over PackerLevelActors with HISM (Video)](https://forums.unrealengine.com/t/5-3-2-navmesh-doesnt-build-properly-over-packerlevelactors-with-hism-video/1306458)
**Author:** [@slam.js](https://forums.unrealengine.com/u/slam.js)\ **Replies:** 9\ **Last updated:** [August 21, 2024, 1:45pm UTC](https://forums.unrealengine.com/t/5-3-2-navmesh-doesnt-build-properly-over-packerlevelactors-with-hism-video/1306458 "2024-08-21T13:45:49Z")
Demonstration: https://www.youtube.com/watch?v=kSmu1t2HI50 It builds properly only when you enter Edit mode. I believe it’s a degradation because 5.3 release notes have this: “Added Navigation Mesh generation optimiza… --- ## [NavMesh agent size changes at runtime](https://forums.unrealengine.com/t/navmesh-agent-size-changes-at-runtime/310611)
**Author:** [@Fervensmiber](https://forums.unrealengine.com/u/Fervensmiber)\ **Replies:** 9\ **Last updated:** [April 30, 2024, 3:02am UTC](https://forums.unrealengine.com/t/navmesh-agent-size-changes-at-runtime/310611 "2024-04-30T03:02:06Z")
Branch: Binary Build version: 4.7.0-2455222 I’m having strange behaviour with NavMesh. When I enable bCanAffectNavigation on Pawn in runtime, the rebuilded NavMesh uses default agent size instead of what is set in Reca… --- ## [Different Nav mesh volumes on the editor and In-Game](https://forums.unrealengine.com/t/different-nav-mesh-volumes-on-the-editor-and-in-game/1713928)
**Author:** [@Chiwaka3](https://forums.unrealengine.com/u/Chiwaka3)\ **Replies:** 1\ **Last updated:** [February 27, 2024, 11:02am UTC](https://forums.unrealengine.com/t/different-nav-mesh-volumes-on-the-editor-and-in-game/1713928 "2024-02-27T11:02:22Z")
I’m having a problem with the navigation volume. When I set it up, it looks pretty decent, but when I start using the AI, the mesh the AI uses is different (it’s moved). Here are some pictures. I tried adding custom Nav… --- ## [Agent radius never works for my ai in 4.11](https://forums.unrealengine.com/t/agent-radius-never-works-for-my-ai-in-4-11/356883)
**Author:** [@codehawk64](https://forums.unrealengine.com/u/codehawk64)\ **Replies:** 7\ **Last updated:** [August 23, 2023, 6:26am UTC](https://forums.unrealengine.com/t/agent-radius-never-works-for-my-ai-in-4-11/356883 "2023-08-23T06:26:22Z")
Its been hell the past 2 days trying to figure out what i am doing wrong regarding changing the agent radius of my large “monster” . I am just trying to make my monster not run into walls and not getting stuck into simpl… --- ## [Navmesh - Multiple agent meshes no longer being generated.](https://forums.unrealengine.com/t/navmesh-multiple-agent-meshes-no-longer-being-generated/761041)
**Author:** [@Dylan\_RRC](https://forums.unrealengine.com/u/Dylan_RRC)\ **Replies:** 2\ **Last updated:** [August 9, 2023, 2:29am UTC](https://forums.unrealengine.com/t/navmesh-multiple-agent-meshes-no-longer-being-generated/761041 "2023-08-09T02:29:38Z")
Hi there, I have been experimenting with using multiple agent masks with Navmeshes (UE 5.1) and have run into a little snag. I had three different masks working correctly (Small, Default, Big), then disabled two of them… --- ## [Should WorldPartitionNavigationDataBuilder initial IterativeWorldBounds using NavigationBounds instead of EditorBounds?](https://forums.unrealengine.com/t/should-worldpartitionnavigationdatabuilder-initial-iterativeworldbounds-using-navigationbounds-instead-of-editorbounds/1211049)
**Author:** [@madeesse](https://forums.unrealengine.com/u/madeesse)\ **Replies:** 1\ **Last updated:** [June 27, 2023, 3:22am UTC](https://forums.unrealengine.com/t/should-worldpartitionnavigationdatabuilder-initial-iterativeworldbounds-using-navigationbounds-instead-of-editorbounds/1211049 "2023-06-27T03:22:32Z")
I found a variable IterativeWorldBounds in UWorldPartitionBuilder, when call UWorldPartitionBuilder::Run function, by default, it will use WorldPartition-\>GetEditorWorldBounds() as CellInfo.EditorBounds. While Iterative… --- ## [Persistent issue with navigation mesh accuracy](https://forums.unrealengine.com/t/persistent-issue-with-navigation-mesh-accuracy/1187971)
**Author:** [@OmiJake](https://forums.unrealengine.com/u/OmiJake)\ **Replies:** 4\ **Last updated:** [June 5, 2023, 9:54pm UTC](https://forums.unrealengine.com/t/persistent-issue-with-navigation-mesh-accuracy/1187971 "2023-06-05T21:54:14Z")
I have tried messing with everything at this point; Nav Agent Radius, Height, Step Height, Tile Size, Cell Size, Cell Height, etc. No Just trying out a simple bridge mesh import and cannot for the life of me get it t… --- ## [Agent Radus isn't taken in consideration for navigation on a a navmesh - Pathfinding & AI Navigation](https://forums.unrealengine.com/t/agent-radus-isnt-taken-in-consideration-for-navigation-on-a-a-navmesh-pathfinding-ai-navigation/1168435)
**Author:** [@SebExiin](https://forums.unrealengine.com/u/SebExiin)\ **Replies:** 1\ **Last updated:** [May 17, 2023, 12:12pm UTC](https://forums.unrealengine.com/t/agent-radus-isnt-taken-in-consideration-for-navigation-on-a-a-navmesh-pathfinding-ai-navigation/1168435 "2023-05-17T12:12:12Z")
I’m having very strange issues with the navmesh, it seems I can’t use different agent radius. I’ve declared supported agent with 3 sizes, Small, Medium, Flying. I can visualize every navmesh by changing the “default… --- ## [Bug: Instanced Foliage Not Affecting Navmesh](https://forums.unrealengine.com/t/bug-instanced-foliage-not-affecting-navmesh/325451)
**Author:** [@DamirH](https://forums.unrealengine.com/u/DamirH)\ **Replies:** 8\ **Last updated:** [August 25, 2022, 4:59am UTC](https://forums.unrealengine.com/t/bug-instanced-foliage-not-affecting-navmesh/325451 "2022-08-25T04:59:07Z")
Heya, Here is the problem: On the right is the same tree but placed directly as a static mesh in the scene. On the left is the foliage painted one. It has collision enabl… --- ## [UE5 City sample](https://forums.unrealengine.com/t/ue5-city-sample/551965)
**Author:** [@Idgi](https://forums.unrealengine.com/u/Idgi)\ **Replies:** 2\ **Last updated:** [August 3, 2022, 7:43am UTC](https://forums.unrealengine.com/t/ue5-city-sample/551965 "2022-08-03T07:43:03Z")
Hello, I have some questions regarding the UE5 city sample: 1 -When I navigate through the project, I see a lot of flickering everywhere. I tried to change the antialiasing options, but none of them seem to give a smoo… --- ## [Navmesh Character Radius](https://forums.unrealengine.com/t/navmesh-character-radius/292820)
**Author:** [@Maddius](https://forums.unrealengine.com/u/Maddius)\ **Replies:** 2\ **Last updated:** [December 1, 2017, 7:35pm UTC](https://forums.unrealengine.com/t/navmesh-character-radius/292820 "2017-12-01T19:35:11Z")
I have a character moving on a navmesh with “AIMoveTo”, the character goes from point A to point B just fine, however it catches on edges, I was wondering what do I need to change in order to change the radius so that th… --- ## [AIMoveTo Node always Failing](https://forums.unrealengine.com/t/aimoveto-node-always-failing/495350)
**Author:** [@Nishil\_Vani](https://forums.unrealengine.com/u/Nishil_Vani)\ **Replies:** 3\ **Last updated:** [February 8, 2022, 6:49am UTC](https://forums.unrealengine.com/t/aimoveto-node-always-failing/495350 "2022-02-08T06:49:00Z")
Creating an RPG game by following the RPG beginner course from vPoly(Youtube), Everything seems to be working fine before this tutorial after this tutorial AImoveto node starts failing. I tried a couple of solutions lik… --- ## [Navmesh draws different in Standalone](https://forums.unrealengine.com/t/navmesh-draws-different-in-standalone/491366)
**Author:** [@J0hn-C0nn0r](https://forums.unrealengine.com/u/J0hn-C0nn0r)\ **Replies:** 1\ **Last updated:** [November 27, 2021, 9:38am UTC](https://forums.unrealengine.com/t/navmesh-draws-different-in-standalone/491366 "2021-11-27T09:38:29Z")
I have no clue what’s going on but in standalone it won’t draw the navmesh between walls…I don’t understand why either, it doesn’t do this in the editor so why is it doing it in stand alone? If someone could I really can… --- ## [Impassable lines on the nav mesh preventing AI from crossing cells](https://forums.unrealengine.com/t/impassable-lines-on-the-nav-mesh-preventing-ai-from-crossing-cells/321533)
**Author:** [@CptWallace](https://forums.unrealengine.com/u/CptWallace)\ **Replies:** 5\ **Last updated:** [November 27, 2021, 8:20am UTC](https://forums.unrealengine.com/t/impassable-lines-on-the-nav-mesh-preventing-ai-from-crossing-cells/321533 "2021-11-27T08:20:06Z")
The Nav Mesh Bounds volume in one of my levels is acting up, displaying green lines over the nav mesh which cannot be crossed by AI characters. Changing some of the settings in the RecastNavMesh settings to change th… --- ## [Navmesh two floors ai bug](https://forums.unrealengine.com/t/navmesh-two-floors-ai-bug/432328)
**Author:** [@anon15677477](https://forums.unrealengine.com/u/anon15677477)\ **Replies:** 4\ **Last updated:** [September 27, 2021, 12:04am UTC](https://forums.unrealengine.com/t/navmesh-two-floors-ai-bug/432328 "2021-09-27T00:04:36Z")
Hi Sorry to my English. In this video : The characters Ai move well when the landscape mesh in set no colision. So there is a navmesh on the moutain. When i activate the colision on the landscape, the ai character … --- ## [AI Can't See Dynamic Nav Mesh Data](https://forums.unrealengine.com/t/ai-cant-see-dynamic-nav-mesh-data/481243)
**Author:** [@mz490464](https://forums.unrealengine.com/u/mz490464)\ **Replies:** 4\ **Last updated:** [April 2, 2021, 5:14pm UTC](https://forums.unrealengine.com/t/ai-cant-see-dynamic-nav-mesh-data/481243 "2021-04-02T17:14:25Z")
When a navmesh modifier enters the navmesh does it automatically regenerate? --- ## [Why does my NavMesh work playing in a level but not when I open level from main menu?](https://forums.unrealengine.com/t/why-does-my-navmesh-work-playing-in-a-level-but-not-when-i-open-level-from-main-menu/479911)
**Author:** [@ravenfather](https://forums.unrealengine.com/u/ravenfather)\ **Replies:** 0\ **Last updated:** [March 8, 2021, 1:32pm UTC](https://forums.unrealengine.com/t/why-does-my-navmesh-work-playing-in-a-level-but-not-when-i-open-level-from-main-menu/479911 "2021-03-08T13:32:29Z")
Hello, I am using 4.26.1 on a multiplayer project. I am using the ZombieSurvivalTemplate from marketplace. Everything has worked fine for a long time but recently I tested from the main menu and the enemies will not mo… --- ## [Broken navigation mesh](https://forums.unrealengine.com/t/broken-navigation-mesh/432954)
**Author:** [@JavaBird](https://forums.unrealengine.com/u/JavaBird)\ **Replies:** 2\ **Last updated:** [February 24, 2021, 6:26am UTC](https://forums.unrealengine.com/t/broken-navigation-mesh/432954 "2021-02-24T06:26:45Z")
Navigation mesh is right until I run simulation or start playing. When I start playing the whole navigation mesh shifts on some direction. Before running: After starting simulation: Rebuilding everything and re… --- ## [Having problems with overlapping Nav Modifiers](https://forums.unrealengine.com/t/having-problems-with-overlapping-nav-modifiers/395147)
**Author:** [@anonymous\_user\_d71a2fac1](https://forums.unrealengine.com/u/anonymous_user_d71a2fac1)\ **Replies:** 3\ **Last updated:** [September 29, 2020, 8:18am UTC](https://forums.unrealengine.com/t/having-problems-with-overlapping-nav-modifiers/395147 "2020-09-29T08:18:08Z")
Hello, i’m currently working on the AI for my game but have gotten a bit stuck with using the Nav modifiers. I understand how the modifiers work and how they should be used, but that is not the issue i’m having. For wh… --- ## [Nav Mesh moves when playing](https://forums.unrealengine.com/t/nav-mesh-moves-when-playing/434591)
**Author:** [@shardfall](https://forums.unrealengine.com/u/shardfall)\ **Replies:** 6\ **Last updated:** [June 23, 2020, 12:12pm UTC](https://forums.unrealengine.com/t/nav-mesh-moves-when-playing/434591 "2020-06-23T12:12:04Z")
As soon as i start playing, either in editor, or building and playing, the nav mesh that i have set for the level shifts it’s location as seen in the images below. No idea how or why this is happening so any help at all … --- ## [Navmesh crash on scaling and loading a scaled one in a level](https://forums.unrealengine.com/t/navmesh-crash-on-scaling-and-loading-a-scaled-one-in-a-level/414278)
**Author:** [@Realgone](https://forums.unrealengine.com/u/Realgone)\ **Replies:** 10\ **Last updated:** [October 23, 2019, 9:05am UTC](https://forums.unrealengine.com/t/navmesh-crash-on-scaling-and-loading-a-scaled-one-in-a-level/414278 "2019-10-23T09:05:36Z")
Hello i have a problem with navmesh bounds volume. when i create a navmesh everything is ok. but when i want to scale it engine crashes.also when i open a level with navmesh bound in it engine crashes. my engine versio… --- ## [Navmesh issue with corner](https://forums.unrealengine.com/t/navmesh-issue-with-corner/304061)
**Author:** [@Atemu](https://forums.unrealengine.com/u/Atemu)\ **Replies:** 10\ **Last updated:** [May 15, 2019, 12:31pm UTC](https://forums.unrealengine.com/t/navmesh-issue-with-corner/304061 "2019-05-15T12:31:05Z")
Hey, I have an issue with corner when I’mu sing Navmesh. The enemies are stuck, especially when climbing a stair and near a small wall. I think that playing with the Navmesh settings would resolve the problem however, d… [Next page](https://forums.unrealengine.com/tag/navmesh-bug/5182.md?match_all_tags=true&page=1&tags%5B%5D=navmesh-bug)