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How can I load scenes additively including a NavMesh set at the same position?

Symptoms
  • I have multiple levels that I would like to cache to reduce loading screen time. Each level has its own NavMesh. The geometry for the levels is anchored in the same location in x,y,z space.

Cause

Loading scenes additively using SceneManager.LoadSceneAsync(scene, LoadSceneMode.Additive) seems to also load the NavMesh from each one of them, resulting in overlapped NavMesh geometry.
 
Resolution
 
At the current moment, there is no way to disable the mesh once the scene has been loaded. The data linked to the mesh is actually loaded as part of the scene data and not linked to any specific prefab or GameObject within the scene.

The best option is to continue to have two scenes and use the multi-scene-editing functionality. Here you can offset the GameObject prior to building the NavMeshData. This way, when you load the object, it is already offset and then you use the offlinks to connect the two together when doing the transition. 

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