How to rebuild a navmesh after generating a dungeon?

Development Programming & Scripting C++
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1

Hey,

I wrote a code that generates a level on begin play. The problem is that my AI canot use that level because I need to regenerate a navmesh.

I tried this, but It doesn’t work.

    NavigationSystem = UNavigationSystemV1::GetNavigationSystem(this);
    if (NavigationSystem)
        NavigationSystem->Build();

I see logs, but no results:

LogNavigationDataBuild: Display: UNavigationSystemV1::Build started...
LogNavigationDataBuild: Display:    Building navigation data using WITH_PHYSX.
LogNavigationDataBuild: Display:    Building navigation data using WITH_CHAOS.
LogNavigationDataBuild: Display: UNavigationSystemV1::Build total execution time: 0.00s

Only way I could make it work to make navmesh dynamic, but it doesn’t seem like an afficient way to do that.

Thank you.

2

Here, My purpose solution.
Set NavMesh RuntimeGeneration to Dynamic Modifiers Only and your level generator need to place NavMesh modifiers accordingly.

3

I tried to set this setting and spawn a navmesh modifier box on the map, it did not trigger an update. Is there a particular way how I have to do it?

4

Did the NavMesh visualization change when you spawn NavMesh modifier?
You can preview it here.

image
image303×881 67.5 KB

You can also set NavMesh runtime generation to dynamic but you will need to manually set bCanEverAffectNavigation on every collision.

5

Dynamic is only one option I was able to make working. Thank you.

I am strill interested to rebuild it manually with C++ after a level generation, but it looks like there is no solution yet.