Static NavMeshes and Level Streaming

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Hi,

I wanted to ask what the current state of streaming static NavMeshes from sublevels is.

To me it seems that right now, I only have the following options:

  • Put the NavMeshBounds in the Persistent Level and have the entire NavMesh always in memory, even for unloaded levels. With a large world, that’s a lot of wasted memory.
  • Set the NavMesh to Dynamic Mode, rebuilding it from scratch at runtime, whenever a level is loaded/unloaded. That’s a lot of runtime overhead. Also, while the NavMesh is rebuilding, I can’t query it reliably.

Is there anything else I can do? Something that lets me dynamically “stitch” together NavMeshes from different sublevels, or similar stuff? I tried putting the NavMeshBounds in the sublevels and hoped it might create a separate NavMesh for each level, but that didn’t seem to work.

Any response is appreciated, even if it’s just “there’s currently no way to stream static NavMeshes”.

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Hi,

Static NavMesh does support streaming. You will need to place at least one NavMeshBounds in Persistent Level and other volumes in sub-levels. Volumes in sub-levels will cut part of navmesh and save that part in sub-level. At runtime when sub-level is loaded/unloaded it will dynamically attach/detach navmesh part to a main navmesh in P-level.
NavMeshBounds in P-level is required to let navigation system know that it should not delete main navmesh actor in P-Level even when all sub-levels are unloaded.

1 Like
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@ddvlost anything else need to be done to achieve static navmesh streaming?

I did everything as you mentioned plus:

  • Fixed tile pool size: True,
  • Force Rebuild on load: True,
  • Runtime Generation: Static,

And it won’t load nav mesh data from sublevels - it’s leaving data from persistent.

Here’s great example on how this isn’t working right now using content example: How to work with NavMesh and big Landscapes? - Content Creation - Unreal Engine Forums

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You’re totally right, this still doesn’t work. Have you found a workaround?? I see the only solution is dynamic navmesh, but I don’t want to waste performance

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Is it possible make p level static navmesh make current streaming level dynamic and save unload level navmesh static

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Follow my answer without dynamics and automatics.