A python script that removes LZSS compression from Majora's Mask 3D ZSI files. It then also converts the ZSI file to CMB format.

3D model files for Majora's Mask 3D are contained in a .zsi file format. Some of these files are also compressed using an algorithm called LZSS.

The best tool I've found so far for accurately ripping models from the game is the Blender 2.79 addon at: MeltyPlayer/OoT3D-Importer

Unfortunately, this addon only supports the loading of decompressed model files in .cmb file format. My python tools here will decompress and convert any .zsi to a common .cmb format, which the Blender addon can read.

Compiled EXE versions of the script are in the dist folder. You can use these instead if you don't have Python installed.

1. Make sure you have backups of your .zsi files somewhere safe.
2. Copy any .zsi models you want to convert into a sub-folder in the same directory as zsi_conversion.exe. The tool crawls down all sub-folders. You can copy every .zsi from the game and convert it all in one go, if you wish.
3. Run zsi_conversion.exe
4. After its done, you'll see .cmb and .zsidecomp files next to all your .zsi files.
5. The .cmb files are what you want. The .zsidecomp are temporary files (copies of the .zsi after LZSS decompression)
6. You'll also notice a file called check_head_log.txt in the directory of the exe. This file contains a log of all the files it scanned, and what "head" the file had, in a csv file format. You can use this log for further batch conversion in another program if you wish.

That's it.

7. You can run zsi_cleanup.exe in the same directory, which will crawl through all your subfolders and delete any .zsi and .zsidecomp files, so your folders are now only filled with .cmb

8. If you copy your .cmb files else where after you're done, you can also run cmb_cleanup.exe to crawl through the subfolders and delete all cmb files.

For python instructions, follow above, but use the .py versions in the src folder instead.

• Alvare, scurest, Starkium, and other members of VG-Resource Forums
• MeltyPlayer - MeltyPlayer/OoT3D-Importer for the addon.
• xdanieldzd and NishaWolfe for: NishaWolfe/N3DSCmbViewer: Zelda OoT3D & MM3D .cmb model viewer - as the basis for my CSharp conversion to Python of LZSS decompressor.
• Also FinModelUtility/LzssDecompressor.cs as basis for my Conversion.

This was only tested with "Scene" files from Majora's Mask 3D. It should in theory work with other Grezzo ZSI files, but I haven't tested it.

I may add the functionality of this python code directly into a fork of MeltyPlayer/OoT3D-Importer some day. But no plans to so at the moment.