CAS Designer Toolkit
Event: Christmas & New Year
Project: CAS Designer Toolkit
by Destrospean
Uploaded Dec. 25, 2025, midnight
Updated Dec. 25, 2025, 2:59 a.m.
Merry Christmas, everyone!
Due to numerous issues related to existing tools for editing CAS parts, I decided to make my own.
Currently, it supports the following features:
- Editing part flags (e.g., age, gender, species, categories, etc.)
- Adding, editing, and deleting presets
- Importing/exporting GEOMs, OBJs, and WSOs
- Displaying morphs
- Changing the shaders and material properties of mesh groups
- Adding mesh groups to LODs
Support for the following is planned:
- Assigning morphs and bones (both of which in the meantime can be done in Meshing Toolkit)
- Creating patterns (this can be done in the meantime with Delphy's Pattern Packager)
- Displaying a full Sim in the 3D renderer
It's lightweight and runs on both Windows and Linux (macOS support planned). For Windows, .NET Framework 4.0 and GTK# 2.12 are required (check the download's instructions).
Do note that this tool has not been 100% tested due to scarcity of testers (the tool is very niche); please be patient and explain whatever issue there is to me.
Acknowledgements
Below is a list of people who helped with this project either directly or indirectly (as well as their contributions):
- Peter L. Jones – Provided the S3PI library which serves as the basis of this tool and many other Sims 3 tools
- CmarNYC – Her code for TS3SimRipper helped with applying patterns to textures and displaying morphs in the 3D renderer; the code for her Meshing Toolkit for importing/exporting OBJs and WSOs was also borrowed
- MonoChaos – Provided the icon for the tool and helped test the tool for issues
- zoeoe – Helped with issues related to the S3PI library
- VirtualHugs – Helped with explaining things related to CASPs; I'm not a mesher, so her advice was incredibly helpful
Testers:
Other Uploads By Destrospean:
Expanded Genealogy
Adds various relation names to the game and also allows the user to restrict romantic interactions between distant relatives