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Bug: Instanced Foliage Not Affecting Navmesh


Here is the problem:

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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 enabled and the navmesh becomes dirty when I place it, but it recalculates covering the tree area as if there's no collision. This current setup is using a NavigationInvoker agent, but the result is the same with traditional navmesh.

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Product Version: UE 4.8
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asked Jul 16 '15 at 08:43 AM in Bug Reports

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avatar image DamirH Jul 16 '15 at 09:56 AM

Just to note - making my static meshes Dynamic Obstacles and restarting the editor makes them generate the navmesh slices. But since my trees won't be walking around anytime soon, I'd like a solution that is not a workaround.

avatar image Lovecraft_K ♦♦ STAFF Jul 16 '15 at 01:20 PM

Hi DamirH -

Thank you for your report. We have assigned this issue to a member of our support staff, and they will begin investigation as soon as possible. If we are unable to reproduce the issue, or we need additional information, our staff member will comment here with additional questions. Otherwise, we will post an ‘Answer’ once we have logged the issue in our bug database or we have a solution for it.

In the meantime, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide: https://answers.unrealengine.com/questions/12363/how-do-i-report-a-bug.html

Thank you -

Eric Ketchum

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1 answer: sort voted first

Hello DamirH,

There is a setting within 'Foliage' mode that will allow your foliage instances to be accounted when the Nav Mesh is generated. Simply click on the static mesh actor while in foliage mode, scroll down to the 'Instance Settings' and set the 'Custom Navigable Geometry' to 'Yes' or 'Even if Not Collidable'.

Now rebuild your scene to allow your Nav Mesh to be recalculated to account for your foliage instances that you have marked as custom navigable geometry.

Foliage Instance Settings

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Foliage with Nav Mesh

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Let me know if this was the appropriate solution, or if you are still experiencing issues.


Andrew Hurley

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answered Jul 16 '15 at 06:41 PM

avatar image DamirH Jul 16 '15 at 07:39 PM

Hey Andrew,

This DID solve my problem actually, I've set it to "Yes" and I had to add UCX collision to my trees, AND restart the editor. The last bit was why I wasn't seeing the changes immediately.

Thanks for the info and sorry if this is intended behavior and not a bug report.

Best regards, Damir H.

avatar image shaq_mobile May 07 '19 at 12:41 AM

I second this, i just had to use that setting and then restart the editor. Before restarting, no changes were shown.

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