Invalid vertex data in source mesh prevents navmesh creation

Unity Engine
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1

I have a flat terrain with several buildings, furniture and decoration (all prefabs) on it. When I try to create a navmesh for it, Unity tells me that the “Source mesh has invalid vertex data and will be skipped.” So no navmesh is created. The full error message is:

RuntimeNavMeshBuilder: Source mesh has invalid vertex data and will be skipped.
UnityEngine.AI.NavMeshBuilder:UpdateNavMeshDataAsync (UnityEngine.AI.NavMeshData,UnityEngine.AI.NavMeshBuildSettings,System.Collections.Generic.List`1<UnityEngine.AI.NavMeshBuildSource>,UnityEngine.Bounds)
Unity.AI.Navigation.NavMeshSurface:UpdateNavMesh (UnityEngine.AI.NavMeshData) (at ./Library/PackageCache/com.unity.ai.navigation@1.1.5/Runtime/NavMeshSurface.cs:294)
Unity.AI.Navigation.Editor.NavMeshAssetManager:StartBakingSurfaces (UnityEngine.Object[ ]) (at ./Library/PackageCache/com.unity.ai.navigation@1.1.5/Editor/NavMeshAssetManager.cs:129)
Unity.AI.Navigation.Editor.NavMeshSurfaceEditor:OnInspectorGUI () (at ./Library/PackageCache/com.unity.ai.navigation@1.1.5/Editor/NavMeshSurfaceEditor.cs:302)
UnityEngine.GUIUtility: ProcessEvent (int,intptr,bool&)

I already searched for the problem and tried this to resolve, but without success:

  • Clearing Nav Mesh Data and baking again
  • Deactivating Static Batching
  • In “Use geometry”, switching from “Render Meshes” to “Physics Colliders”

How can I find out which vertex data is invalid so that I could remove it? :face_with_spiral_eyes: I have dozens of prefabs in the scene. Aside from this error, the whole scene works flawlessly but without a navmesh I cannot put traffic in it. Has anyone an advice?

2

is it the terrain itself have the problem? if it is flat anyway, replace that with a plane and try again

3

Thank you for your answer. In the meantime, I got the navmesh working and the terrain is ok, but I am still looking for the cause for the error message. A reference to the source mesh with the invalid vertex in the message would have been valueable.

4

EDIT: I just solved this, for me at least. My issue was that there were several empty PolyShape objects lying around my scene, which I found through the Hierarchy. Removing them instantly fixed my game.

Hey, how did you get the navmesh to work? I have this exact issue, also with countless gameobjects, and my game will not work at all at the moment due to this issue.

5

Well, in my case the Gizmo was deactivated by accident, and this was hiding not only the usual lines but the navmesh, too. So was navmesh was created but I just could not see it. As I activated the gizmo again, I was able the use all of the level in a normal way, even when the error message was present. So it seemed not to be as serious as I had assumed.
For the level is not very complex, I think the problem here could have its origin in an asset that does not work right for me anyway; I will remove it and see whether the message is gone then.