AssetDatabase unwrapping lightmap uv

Hi, I want to know if this command :

Unwrapping.GenerateSecondaryUVSet( mymesh );

Automatically save something in the mesh meta ? or not ?

Maybe I must use something like that :

Code (csharp):

1. string path = AssetDatabase.GetAssetPath( gameObject );
2. ModelImporter model = AssetImporter.GetAtPath( path ) as ModelImporter;
3.  
4. model.generateSecondaryUV = true;
5. Unwrapping.GenerateSecondaryUVSet( meshLightmapped );
6.  
7. AssetDatabase.ImportAsset( path );

I never do something like that but I really need it :/. So if someone got an idea on this point

Edit : I found a solution to do this, there it is :

Code (csharp):

1. //Recursive function switch all uv2 of mesh to true
2.     private void GenerateLightMapUV2( GameObject gameObject )
3.     {
4.         MeshFilter meshFilter = gameObject.GetComponent<MeshFilter>();
5.         MeshRenderer meshRenderer = gameObject.GetComponent<MeshRenderer>();
6.  
7.         //Check if my mesh have and filter and a renderer so it's the final
8.         if( meshFilter != null  meshRenderer != null )
9.         {
10.             //Take the mesh of the file
11.             Mesh meshLightmapped = meshFilter.sharedMesh;
12.  
13.             //Take the file's path and put it in a string
14.             string path = AssetDatabase.GetAssetPath( meshLightmapped );
15.             //Define a modelImporter to modify its importing settings
16.             ModelImporter model = AssetImporter.GetAtPath( path ) as ModelImporter;
17.  
18.             //Put the generateSecondaryUV field to true and GenerateUVSet for the mesh
19.             model.generateSecondaryUV = true;
20.             Unwrapping.GenerateSecondaryUVSet( meshLightmapped );
21.  
22.             //Update the mesh setting in editor
23.             AssetDatabase.ImportAsset( path );
24.         }
25.             //If the previous mesh don't have both so go in children
26.         foreach( Transform t in gameObject.transform )
27.             GenerateLightMapUV2( t.gameObject );
28.     }