# Skipping dirty area creation because of empty bounds

**URL:** <https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715>\
**Category:** World Creation\
**Tags:** Navigation, dynamic-navmesh, unreal-engine, Instanced-Mesh, Foliage, question\
**Created:** [May 21, 2021, 10:49pm UTC](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715 "2021-05-21T22:49:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jau\_Studio](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jau_studio/32/886547_2.png) [@Jau\_Studio](https://forums.unrealengine.com/u/Jau_Studio)\
**Post date:** [May 21, 2021, 10:49pm UTC](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715/1 "2021-05-21T22:49:45Z")

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Hello,

Does anyone know why the dynamic navmesh finds some empty bounds foliage ?  
Here is my output :

```
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: BP_DeadTreeResourceFoliage_C /Game/MainGame/Maps/Volcano13/Volcano_Height-505/Volcano_Height-505_x7_y1.Volcano_Height-505_x7_y1:PersistentLevel.InstancedFoliageActor_0.BP_DeadTreeResourceFoliage_C_0)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: BP_DeadTreeResourceFoliage_C /Game/MainGame/Maps/Volcano13/Volcano_Height-505/Volcano_Height-505_x7_y1.Volcano_Height-505_x7_y1:PersistentLevel.InstancedFoliageActor_0.BP_DeadTreeResourceFoliage_C_1)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: BP_DeadTreeResourceFoliage_C /Game/MainGame/Maps/Volcano13/Volcano_Height-505/Volcano_Height-505_x7_y1.Volcano_Height-505_x7_y1:PersistentLevel.InstancedFoliageActor_0.BP_DeadTreeResourceFoliage_C_2)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: BP_StoneResourceFoliageComponent_C /Game/MainGame/Maps/Volcano13/Volcano_Height-505/Volcano_Height-505_x7_y1.Volcano_Height-505_x7_y1:PersistentLevel.InstancedFoliageActor_0.BP_StoneResourceFoliageComponent_C_0)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: FoliageInstancedStaticMeshComponent /Game/MainGame/Maps/Volcano13/Volcano_Height-505/Volcano_Height-505_x7_y1.Volcano_Height-505_x7_y1:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_0)

```

I added a print node printing the bounds Box Extent in the Foliage Instanced Static Mesh Components and noticed that sometimes, the values are 0,0,0.

I don’t understand why. Any idea ?

Thank you so much !

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<div class="post-metadata">

**Author:** ![Hyaniner](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hyaniner/32/1194580_2.png) [@Hyaniner](https://forums.unrealengine.com/u/Hyaniner)\
**Post date:** [February 9, 2022, 6:44am UTC](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715/2 "2022-02-09T06:44:25Z")

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> [@"Skipping dirty area creation because of empty bounds" Warning](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds-warning/477474):
>
> LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds Any ideas on how to fix this LogNavitationDirtyArea Warning? I can’t find literally anything on this. Thanks!

“world settings\>world\>navigation system config == NullNavSysConfig”

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<div class="post-metadata">

**Author:** ![Gen\_X](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/gen_x/32/940753_2.png) [@Gen\_X](https://forums.unrealengine.com/u/Gen_X)\
**Post date:** [October 3, 2022, 5:39pm UTC](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715/3 "2022-10-03T17:39:20Z")

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It works for my Project 🙂

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<div class="post-metadata">

**Author:** ![AlchemicalWorks](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/alchemicalworks/32/471554_2.png) [@AlchemicalWorks](https://forums.unrealengine.com/u/AlchemicalWorks)\
**Post date:** [December 1, 2022, 1:34pm UTC](https://forums.unrealengine.com/t/skipping-dirty-area-creation-because-of-empty-bounds/483715/4 "2022-12-01T13:34:00Z")

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Actually this was never solved here in case you want to keep using a navmesh. The navmesh gets hung up on instanced static mesh components that have 0 instances. If you simply remove those components or deactivate collision on them, you won’t get the warning anymore.