How to programmatically create AssetBundles in editor Scripts

Do you know if is there a way to add/remove objects using editor scripts to/from AssetBundles?

i have found how to list objects, names, even delete AssetBundles names using AssetDatabase, but i can't see how to create or delete AssetBundles names nor how to add objects into an existing AssetBundle




Or do you know if there is another way to add or delete objects to AssetBundles using scripts?

Regards!!!

 

I have no good answer for you, I haven't done any scripting builds and stuff like that, but just tips in case you missed them.
1; Check on the Scriptable Pipeline, maybe there are some answers for you there:
https://docs.unity3d.com/Packages/com.unity.scriptablebuildpipeline@1.7/api/index.html
2; Try the Build Pipeline subforum, more people who does these things or at least try, are there.

 

Adding new asset bundle names - simply tag any asset with the new asset bundle name you want. it will be added to that list.

Regarding adding objects to asset bundles - what do you mean by that? an asset bundle is built so u cannot simply "add a new asset into it" without rebuilding.

 

No... I do know how to manually create an AssetBundle, what i'm looking for is to create an automatization script, in witch the user just need to press a button and the script automatically downloads the required names from a server, organizes the objects, tags them, adds them to the AssetBundle, creates the Assetbundle and uploads it to the server

I have almost everything finished except where the script must desassign and delete unused Assetbundles, create the new AssetBundle Name and Variant, add the required objects and start packing the new AssetBundle

 

https://docs.unity3d.com/ScriptReference/BuildPipeline.BuildAssetBundles.html

 

For assigning/deassigning, you can use asset import APIs.
https://docs.unity3d.com/ScriptReference/AssetImporter-assetBundleName.html
https://docs.unity3d.com/ScriptReference/AssetImporter-assetBundleVariant.html

For cleaning unused bundle names
https://docs.unity3d.com/ScriptReference/AssetDatabase.RemoveUnusedAssetBundleNames.html

 

As the above user implied, you can achieve this using a combination of the static method

UnityEditor.AssetImporter.GetAtPath()

followed by using the AssetImporter object this returns to call

SetAssetBundleNameAndVariant()

or by just setting the

assetBundleName

and/or

assetBundleVariant

field(s) directly.

A simple implementation might look like this:

Code (CSharp):

1. public class BundleNamer : MonoBehaviour {
2.     public void Start() {
3.       #if UNITY_EDITOR
4.         var importer = UnityEditor.AssetImporter.GetAtPath("Assets/Prefabs/x.prefab");
5.         importer.assetBundleName = "bundle_1";
6.       #endif
7.     }
8. }

In more complicated scenarios, you'd probably actually loop over the files of certain asset-folders, and bundle them according to the name of the parent folder or something. Finer specifics depend on how your project is set up.

The

#if UNITY_EDITOR

and

#endif

lines are not strictly necessary but will save you from having to remove the component that refers to this script every time you build, since having anything from

UnityEditor

will make your build fail when you try to export your project to EXE, WebGL, etc.

 

For editor scripts that automatically bundle different assets into asset bundles, i discourage the usage of "tagging" assets in the project with an asset bundle name and variant.

Instead, i'd go with the overload of BuildPipeline.BuildAssetBundles that takes an array of AssetBundleBuild objects (see the docs here, in the bottom part of the page).

That page even has a short code sample to follow, to demonstrate how this is done:

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3.  
4. public class BuildAssetBundlesBuildMapExample : MonoBehaviour
5. {
6.     [MenuItem("Example/Build Asset Bundles Using BuildMap")]
7.     static void BuildMapABs()
8.     {
9.         // Create the array of bundle build details.
10.         AssetBundleBuild[] buildMap = new AssetBundleBuild[2];
11.  
12.         buildMap[0].assetBundleName = "enemybundle";
13.  
14.         string[] enemyAssets = new string[2];
15.         enemyAssets[0] = "Assets/Textures/char_enemy_alienShip.jpg";
16.         enemyAssets[1] = "Assets/Textures/char_enemy_alienShip-damaged.jpg";
17.  
18.         buildMap[0].assetNames = enemyAssets;
19.         buildMap[1].assetBundleName = "herobundle";
20.  
21.         string[] heroAssets = new string[1];
22.         heroAssets[0] = "char_hero_beanMan";
23.         buildMap[1].assetNames = heroAssets;
24.  
25.         BuildPipeline.BuildAssetBundles("Assets/ABs", buildMap, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows);
26.     }
27. }