# Why doesn't Navmesh rebuild in real-time when physics objects are moved? (UE4.1.0)

**URL:** <https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634>\
**Category:** AI\
**Tags:** navigation-mesh, Navigation, unreal-engine, navmesh, question\
**Created:** [May 6, 2014, 10:34am UTC](https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634 "2014-05-06T10:34:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![AntonioModer](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AntonioModer](https://forums.unrealengine.com/u/AntonioModer)\
**Post date:** [May 6, 2014, 10:34am UTC](https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634/1 "2014-05-06T10:34:59Z")

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Details: [https://www](https://www)…com/watch?v=\_dsOZPFLvaQ&feature=player\_detailpage

Navmesh rebuild only after “mouse button release” event.

**Navmesh “in play mode” is same! ( [UE4.1.0 Navmesh don't rebuild with physics objects in dynamics (in play mode) - YouTube](http://youtu.be/rpF55U5JcQo))**

**It is possible to rebuild Navmesh with physics objects in dynamics?**

P.S: i found this: [https://docs.unrealengine.com/latest/CHN/API/RuntimeModules/Engine/AI/Navigation/ARecastNavMesh/index.html](https://docs.unrealengine.com/latest/CHN/API/RuntimeModules/Engine/AI/Navigation/ARecastNavMesh/index.html)

and this: [A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums](https://wiki.unrealengine.com/Custom_Blueprint_Node_Creation)

> **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)**
>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — https://unrealcommunity.wiki/! You will be able to find content from...

**It posible to create new “Blueprint function call: RecastNavMesh”?**

But i am not a programer and i don’t know how do this.

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**Author:** ![anonymous\_user\_33800a51](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_33800a51](https://forums.unrealengine.com/u/anonymous_user_33800a51)\
**Post date:** [May 6, 2014, 8:20pm UTC](https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634/2 "2014-05-06T20:20:34Z")

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Hey Antonio,

NavMesh generation doesn’t work with physics currently. This is a known issue.

In meantime, you may need to have your physics object begin play in it’s final location, then move it to where it is falling from at runtime and let it fall from there. This will only really work if you know exactly where physics object will fall, such as a box falling straight down. For more complicated objects, you may need to fully animate their movement to make sure it lands where you want, and follow same process.

I know it’s not ideal, but we are working to improve NavMesh system currently and hope to have issues like these resolved quickly.

Thanks for your report!

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**Author:** ![AntonioModer](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AntonioModer](https://forums.unrealengine.com/u/AntonioModer)\
**Post date:** [May 6, 2014, 8:51pm UTC](https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634/3 "2014-05-06T20:51:43Z")

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Thank you!

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**Author:** ![AntonioModer](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AntonioModer](https://forums.unrealengine.com/u/AntonioModer)\
**Post date:** [June 13, 2014, 9:39pm UTC](https://forums.unrealengine.com/t/why-doesnt-navmesh-rebuild-in-real-time-when-physics-objects-are-moved-ue4-1-0/282634/4 "2014-06-13T21:39:08Z")

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In UnrealEngine 4.2.0 this is work:

[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/d/7/8d7d4d6f67d957d7aea48d2a0414ad68b0a8f419.jpeg "UE4.2.0 Navmesh rebuild with physics objects in dynamics") ](https://www.youtube.com/watch?v=MPIebbOGD6A)

Thanks Epic! 🙂