Unity’s been around since 2005, and in that time it’s grown from a OS X only game engine to a cross platform engine for games, software and interfaces. Unity’s an incredibly powerful platform for both seasoned developers and amateurs alike. In this guide I’ll be using files created with Unity 4. Unity 5 beta is still in development, and I’ve no idea if any of these methods will work with version 5.
Reverse Engineering Unity3D Files (Decompiling)
First off you’ll need some tools.
Now with all of those downloaded and extracted/installed, you need to get yourself a unity3d file. This procedure is the same for every unity3d file, no matter what platform it’s for. So go grab yourself one of those. In this guide I’ll be using one I downloaded from a game that’s in development. They use Unity as a front end for their login system.
So first things first, you’ll want to put your .unity3d file, and the bms script in the same folder, just for ease of use. Then run quickbms.exe.
quickbms will ask you to select the script you want to use. Select the one you downloaded.
It’ll then ask you to select the unity3d file you want to extract.
And finally it’ll ask for a directory to extract the files to. Select whatever you like, for this, I’ll just go with the quickbms directory.
And there we have it! You can go ahead and use dotPeek to examine the dlls, but I’m more interested in what’s in the .assets files.
Now, there’s two ways to do this, but I find the easiest and quickest way is to select your unity3d file, and move it to the same directory you extracted disunity to. We can use disunity to extract all the assets within a unity3d file. The reason we didn’t just do this first is disunity ignores the dlls, and other directories that might be in there.
Now, shift right click in explorer, and select “Open command window here”.
Now the command used to extract the unity3d file is very simple disunity extract filename.unity3d
disunity will now extract whatever assets are within the unity3d file. Depending on the filesize, this could take anything from a few seconds to a few minutes. Once it’s done, navigate to the folder it created, and enjoy all your wonderful assets. Depending on what you got your unity3d file from, there could be nearly anything in here, including 2D and 3D assets, fonts, shaders, audio, text files, who knows!
Thanks very much for reading through this, and if you’ve any questions or comments, let me know.
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