# Nav mesh inside mesh **URL:** \ **Category:** Asset Creation\ **Tags:** navigation-mesh, Navigation, nav-mesh-bounds-volu, nav-mesh, unreal-engine, question\ **Created:** [October 11, 2016, 7:17pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063 "2016-10-11T19:17:47Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![UaLightning12](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ualightning12/32/489911_2.png) [@UaLightning12](https://forums.unrealengine.com/u/UaLightning12)\ **Post date:** [October 11, 2016, 7:17pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/1 "2016-10-11T19:17:47Z")
Hi! After migrate my project from 4.12 to 4.13 i can’t build nav mesh inside the mesh. So, I tried make it in first shooter template. But i cant do it ![110410-el1m8ialrik[1].jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/4/5/e45aec5dcc8307e65b8018ad0f5e71be18d587a4.jpeg) Can any body halp me? ---
**Author:** ![UaLightning12](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ualightning12/32/489911_2.png) [@UaLightning12](https://forums.unrealengine.com/u/UaLightning12)\ **Post date:** [October 11, 2016, 7:19pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/2 "2016-10-11T19:19:22Z")
So, in 4.12 it worked very well ---
**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\ **Post date:** [October 11, 2016, 7:23pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/3 "2016-10-11T19:23:45Z")
Hey UaLightning12, I have a few questions: - Is the mesh that you can’t get the Nav Mesh to generated in a BSP brush, or is it something you’ve imported from a modeling program? - Does the mesh you’re trying to build the Nav Mesh on have collision enabled on it? - Would you be able to provide the affected mesh so I can try it on my end? ---
**Author:** ![UaLightning12](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ualightning12/32/489911_2.png) [@UaLightning12](https://forums.unrealengine.com/u/UaLightning12)\ **Post date:** [October 11, 2016, 7:34pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/4 "2016-10-11T19:34:03Z")
Hi, Sean Flint! I can’t get the Nav Mesh to generate something I imported from a modeling program. Yes, collision is enabled. You can create something like cave from BSP and **convert to static mesh**. So, its work very good in 4.12. Thanks you! ---
**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\ **Post date:** [October 12, 2016, 3:03pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/5 "2016-10-12T15:03:48Z")
I’ve attempted to reproduce this issue in a clean project. Here’s what I did: 1. Created a hollow bsp brush 2. Created a subtractive bsp brush to make a doorway in the hollow brush 3. Converted both brushes into a static mesh 4. Placed a Nav Mesh Bounds Volume. After doing this, my nav mesh generated just fine as seen in the image below. ![110542-navmesh.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/3/9/23978bf474f04f7de848916022071011e3c82714.png) Are you able to reproduce this consistently in a clean project? If so, please provide a detailed list of steps. Thanks! ---
**Author:** ![UaLightning12](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ualightning12/32/489911_2.png) [@UaLightning12](https://forums.unrealengine.com/u/UaLightning12)\ **Post date:** [October 12, 2016, 4:35pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/6 "2016-10-12T16:35:08Z")
Hi, Sean Flint! 1. I create 1st person template 2. Created from BSP something like tunnel or cave ![110552-22222.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/e/1/7e1e531ead5828f3bde1d7a3e6bf44f57e36ca9f.jpeg) 1. Convert to static mesh 2. Build navigation ![110551-33333+–+копія.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/5/2/252d77a99e8b86eb1124eb8f4442884fb5dd4b75.png) ---
**Author:** ![UaLightning12](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ualightning12/32/489911_2.png) [@UaLightning12](https://forums.unrealengine.com/u/UaLightning12)\ **Post date:** [October 12, 2016, 4:40pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/7 "2016-10-12T16:40:02Z")
So, you can also create an empty project and try build navigation inside the cave ([[FREE] Luos's FREE Modular Caves/Rocks mini Package! - Community Content, Tools and Tutorials - Unreal Engine Forums](https://forums.unrealengine.com/showthread.php?64883-FREE-Luos-s-FREE-Modular-Caves-Rocks-mini-Package!)) ---
**Author:** ![Sean\_Flint](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sean\_Flint](https://forums.unrealengine.com/u/Sean_Flint)\ **Post date:** [October 12, 2016, 5:41pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/8 "2016-10-12T17:41:32Z")
I have been able to reproduce your issue and have entered a report, which you can track here: [Unreal Engine Issues and Bug Tracker (UE-37221)](https://issues.unrealengine.com/issue/UE-37221) Thank you for your report. Have a great day ---
**Author:** ![anonymous\_user\_c120ce39](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_c120ce39](https://forums.unrealengine.com/u/anonymous_user_c120ce39)\ **Post date:** [July 30, 2018, 6:07pm UTC](https://forums.unrealengine.com/t/nav-mesh-inside-mesh/373063/9 "2018-07-30T18:07:22Z")
Issue still exists in 4.20. Ridiculous, it makes navmesh almost redundant unless you’re willing to manually assign modifiers.