koobas.hobune.stream
Modify prefabs in editor script
I am trying to write a script that will update the material settings on a set of prefabs, which I can then save.
I have seen a number of questions asking to do this, but none of the examples work. My code is below.
Whenever I run this, the editor reacts by re-importing assets, and there are no exceptions indicating that my call to ReplacePrefab() is incorrect - but the prefabs themselves remains unchanged.
What have I missed?
AssetDatabase.StartAssetEditing();
var guids = AssetDatabase.FindAssets(" t:GameObject",new string[]{"Assets/city_assets"});
foreach(var g in guids)
{
string path = AssetDatabase.GUIDToAssetPath(g);
GameObject prefab = AssetDatabase.LoadAssetAtPath(path, typeof(GameObject)) as GameObject;
GameObject instance = Object.Instantiate(prefab);
UpdateMaterials(instance); //operates on the components of instance
PrefabUtility.ReplacePrefab(instance, prefab, ReplacePrefabOptions.ConnectToPrefab);
}
AssetDatabase.StopAssetEditing();
I dont think Object.Instantiate should work here. This instantiates a object in the scene, as far asI know it does not create an asset.
I guess you'll need PrefabUtility.CreatePrefab or just modify the prefab itself ins$$anonymous$$d of creating a copy, modifying that and replacing it...
What happens if you do something like this?
AssetDatabase.StartAssetEditing(); // Not sure if needed
var guids = AssetDatabase.FindAssets(" t:GameObject",new string[]{"Assets/city_assets"});
foreach(var g in guids)
{
string path = AssetDatabase.GUIDToAssetPath(g);
GameObject prefab = AssetDatabase.LoadAssetAtPath(path, typeof(GameObject)) as GameObject;
Update$$anonymous$$aterials(prefab);
}
AssetDatabase.StopAssetEditing(); // Not sure if needed
ps. Note that it could be that the problem lies with editing the material. As $$anonymous$$aterials of prefabs are assets themself. So if you modify renderer.material ins$$anonymous$$d of renderer.sharedmaterial your change to the material will most likely not persist and cause materials to 'leak' (you should get an info log in the console when that happens I believe).
@troien I thought that would work also - it was the first thing I tried. Unfortunately the same thing happens - no changes take effect, even when flagging the object as dirty. I will investigate further and see if it is a problem with the materials settings.
try PrefabUtility.InstantiatePrefab instead of Object.Instantiate, and call AssetDatabase.SaveAssets() after you finish all the work
