Nav Mesh Bounds Best Practices

You need dynamic navmesh then. Unfortunately dynamic navmeshes does not support streaming yet. But you can still use it with streaming levels, you will need to enable bUseFixedTilePool as mentioned in linked topic. With fixed tile pool navmesh will rebuild only areas covered by navigation volumes that is streamed in/out.

We will add proper support for streaming of dynamic navmeshes in near future.

In 4.8 version you will also have “semi-dynamic” navmeshes. It’s basically a static navmesh that supports dynamic obstacles (navigation area modifiers).