NavMesh Surface not Visible in Scene View Without "AI Navigation" Unity Package

[The-Bush]

Hey all. I was encountering an issue where I could not see the NavMesh surface in the scene view after baking the mesh. I resolved this issue by going to Window > Package Manager > Select "Unity Registry" > Search "AI Navigation" > Install.

This package seems dependent on that Unity package (at least for showing the NavMesh in the scene view) but this is not mentioned in any of the documentation I could find.

[h8man]

I will check. Unity hide everything into new package

[The-Bush]

For context, this was on Unity 2022.3.10f1, 2D URP preset

[dongfangliu]

For what reason, you copy and use the navigation package's code in this asset? Shall we just use the unity's ai navigation package? @h8man

[1severus1]

In my case, "AI navigation" has already installed before I use this package.
However, I have to remove and install it again to make bake work correctly and visible in scene view.
Hope it will help someone with same problem.

[QuentinNev]

On Unity 6000.0.44f1
I tried with and without Unity's AI Navigation package 2.0.6 and by installing via github link or manifest : I can't see the surface.
Is it a known issue for Unity 6000 ?

[RedGlow]

Having the same problem as @QuentinNev : I'm on Unity 6000.0.43f1 and with or without AI Navigation package, the navigation mesh is not visible.

[RedGlow]

BTW, I temporarily solved the problem by putting together a script that shows the mesh in edit mode:

using UnityEngine;

public class NavMeshDisplay : MonoBehaviour
{
#if UNITY_EDITOR
	Hash128 meshSignature;
	Mesh navigationMesh;

	[SerializeField] Color meshColor = new(0, 0, 1, 0.2f);
	[SerializeField] Color meshWireColor = new(0, 0, 1, 0.4f);

	void OnDrawGizmosSelected()
	{
		var triangulation = UnityEngine.AI.NavMesh.CalculateTriangulation();
		Hash128 hash = new();
		foreach ( var i in triangulation.indices )
		{
			hash.Append( 0 );
			hash.Append( i );
		}
		foreach ( var i in triangulation.vertices )
		{
			hash.Append( 1 );
			hash.Append( i.x );
			hash.Append( i.y );
			hash.Append( i.z );
		}

		if ( meshSignature != hash )
		{
			Debug.Log( "recomputing mesh to draw" );
			meshSignature = hash;

			navigationMesh ??= new Mesh();
			navigationMesh.Clear();
			navigationMesh.SetVertices( triangulation.vertices );
			navigationMesh.SetTriangles( triangulation.indices, 0 );
			navigationMesh.RecalculateNormals();
		}

		Gizmos.color = meshColor;
		Gizmos.DrawMesh( navigationMesh );
		Gizmos.color = meshWireColor;
		Gizmos.DrawWireMesh( navigationMesh );
	}
#endif
}

[MRouterKing]

BTW, I temporarily solved the problem by putting together a script that shows the mesh in edit mode:

using UnityEngine;

public class NavMeshDisplay : MonoBehaviour
{
#if UNITY_EDITOR
Hash128 meshSignature;
Mesh navigationMesh;

[SerializeField] Color meshColor = new(0, 0, 1, 0.2f);
[SerializeField] Color meshWireColor = new(0, 0, 1, 0.4f);

void OnDrawGizmosSelected()
{
var triangulation = UnityEngine.AI.NavMesh.CalculateTriangulation();
Hash128 hash = new();
foreach ( var i in triangulation.indices )
{
hash.Append( 0 );
hash.Append( i );
}
foreach ( var i in triangulation.vertices )
{
hash.Append( 1 );
hash.Append( i.x );
hash.Append( i.y );
hash.Append( i.z );
}

  if ( meshSignature != hash )
  {
  	Debug.Log( "recomputing mesh to draw" );
  	meshSignature = hash;

  	navigationMesh ??= new Mesh();
  	navigationMesh.Clear();
  	navigationMesh.SetVertices( triangulation.vertices );
  	navigationMesh.SetTriangles( triangulation.indices, 0 );
  	navigationMesh.RecalculateNormals();
  }

  Gizmos.color = meshColor;
  Gizmos.DrawMesh( navigationMesh );
  Gizmos.color = meshWireColor;
  Gizmos.DrawWireMesh( navigationMesh );

}
#endif
}

Having the same problem as @QuentinNev : I'm on Unity 6000.0.43f1 and with or without AI Navigation package, the navigation mesh is not visible.

BTW, I temporarily solved the problem by putting together a script that shows the mesh in edit mode:

using UnityEngine;

public class NavMeshDisplay : MonoBehaviour
{
#if UNITY_EDITOR
Hash128 meshSignature;
Mesh navigationMesh;

[SerializeField] Color meshColor = new(0, 0, 1, 0.2f);
[SerializeField] Color meshWireColor = new(0, 0, 1, 0.4f);

void OnDrawGizmosSelected()
{
var triangulation = UnityEngine.AI.NavMesh.CalculateTriangulation();
Hash128 hash = new();
foreach ( var i in triangulation.indices )
{
hash.Append( 0 );
hash.Append( i );
}
foreach ( var i in triangulation.vertices )
{
hash.Append( 1 );
hash.Append( i.x );
hash.Append( i.y );
hash.Append( i.z );
}

  if ( meshSignature != hash )
  {
  	Debug.Log( "recomputing mesh to draw" );
  	meshSignature = hash;

  	navigationMesh ??= new Mesh();
  	navigationMesh.Clear();
  	navigationMesh.SetVertices( triangulation.vertices );
  	navigationMesh.SetTriangles( triangulation.indices, 0 );
  	navigationMesh.RecalculateNormals();
  }

  Gizmos.color = meshColor;
  Gizmos.DrawMesh( navigationMesh );
  Gizmos.color = meshWireColor;
  Gizmos.DrawWireMesh( navigationMesh );

}
#endif
}

You can fix the error? i have the same

[h8man]

#245 a workaround might help