This tutorial will guide you through modifying images stored in a SpriteAtlas.#

(Result showcase – Sandbag)

If you have already tried modifying most images other than character sprites using the method described in the advanced tutorial, you probably noticed that it barely works for them.
This is because those images are packed using the SpriteAtlas method. A major reason is that the file references no longer match correctly.

After completing this tutorial, you should be able to modify most in-game images without being limited by the original image size.

CAUTION

Modding may introduce unknown risks, including game instability, save corruption, compatibility issues, and even security vulnerabilities. Always back up your game files and proceed carefully.
You assume all risks — I cannot take responsibility if problems occur.

NOTE

This workflow is very complex and tedious. Please read every step carefully. If you encounter problems, you can open an issue to ask for help.

Step 1️⃣#

In this tutorial, we’ll use the sandbag in the living room as an example.
(On my computer, its file path is:)

1
C:\Program Files (x86)\Steam\steamapps\common\Otherworld Legends\Otherworld Legends_Data\StreamingAssets\aa\StandaloneWindows64\graphiceffecttextureseparatelygroup_assets_assets\sprites\unit\unit_other_pile.psd_0678876b821c494df01ee1384bec84f2.bundle

Here is the image we want to replace it with:

Credit

Next, open the Unity project from the advanced tutorial and locate the Texture2D folder.

I recommend putting the previous tutorial (about the Asura boss) into a different folder. Then create a new folder, for example named Other_Pile.

Put the image you want to replace into the Other_Pile folder, then modify its parameters in the Inspector.

Make sure:

1. Texture Type = Sprite (2D and UI)
2. Sprite Mode = Multiple
3. Mesh Type = Full Rect
4. Generate Physics Shape = Off
5. Read/Write = On
6. Filter Mode = Point (no filter)
7. Compression = None
8. Click Apply

This time, we will manually edit the spritesheet (Slice Sprites). Click Sprite Editor.

First is the sandbag base. Since we don’t have a base here, just draw a rectangle in any empty area.
Be sure to use the exact same name as shown in the example.

Next is the first frame of the sandbag. Draw the rectangle over the statue on the left.
Make sure to set the Pivot to Bottom Center.
You can also use Custom if you know how.

There are seven more frames. Draw all of them on the statue on the right.
Again, set the Pivot to Bottom Center.
Name them according to the image below.

After finishing, click Apply. You should see the same sprites as shown in the picture.

Step 2️⃣#

In Unity Project Settings, find Sprite Packer → Mode and set it to:

Sprite Atlas V1 – Always Enabled

Next, right-click in the Texture2D folder and create a Sprite Atlas.
Name it: unit_other_pile

Adjust its settings:

• Filter Mode = Point
• Compression = None
• Drag all the sliced sprites into Packables
  (⚠️ It seems you can only add them one by one, but there aren’t many, so it’s fine.)

Now the most important part — just like before, we need to build this file.

Name it:

sactx-0-128x128-bc7-unit-other-pile

Also, put the original Texture2D into the atlas as well.

Then run Tools / Build Bundles (the script provided in the previous tutorial).
Check whether the new file is generated.

Step 3️⃣#

Next, we need to solve the file reference problem.
This part can be hard to understand and requires repeated operations.

First, take a look at the diagram I made. If you don’t understand it now, that’s okay — it will make sense later.

Unity uses signed integers (can be positive or negative) as references for textures.
You can think of them as IDs.
Our goal is to modify the IDs inside the AssetBundle we generated so the game can correctly find these resources.

1
C:\Program Files (x86)\Steam\steamapps\common\Otherworld Legends\Otherworld Legends_Data\StreamingAssets\aa\StandaloneWindows64\graphiceffecttextureseparatelygroup_assets_assets\sprites\unit\unit_other_pile.psd_0678876b821c494df01ee1384bec84f2.bundle

Step 4️⃣#

This step is similar to previous workflows.

In UABEA (with the original game bundle open):

1. For the sactx... Texture2D, use
   Plugins → Edit Texture to replace it with the statue image from Unity.
2. Use Import Dump to replace the SpriteAtlas with the modified dump.
3. Use Import Dump to replace all Sprite dumps with the modified ones.