Use Primitive Colliders instead of Mesh Colliders

The simple version is that in order to bake the navmesh at runtime, Unity requires read/write access to any meshes that use Mesh Colliders in your scene.

The best option for most geometry is to use primitive colliders (Box Collider, Capsule Collider) for your scene geometry. This is more performant in general, and is recommended for best performance.

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