It all started as a simple .obj model loader... but I craved knowledge, I wanted to know how you can create and apply animations to a skeletal model.
So that's why I also coded a The Sims 1 .skn/.cmx/.cfp loader too! Yeah, The Sims 1 skeletons are very simple (no weight mapping, only one bone per vertex), but now I do have the knowledge of how this works, so in the future I can improve it further.
The animation code is borked beyond salvation tho, I need to swap the arm bones because, if I don't do that, the arms are wonky because their animations are swapped (?).
Also I don't apply the base skeleton rotation, not sure if it is needed but, when applying it, the animation becomes all borked... but I do translate based on the base skeletion + animation transform.
- https://web.archive.org/web/20050501050322/http://simtech.sourceforge.net/tech/cfp.html
- https://github.com/mixiate/ts1-blender-io/
By the way, I think that Milkshape 3D's is incorrectly previewing The Sims 1' skeleton. Inverting the quaterions makes the default The Sims 1 skeleton be in a "default" pose (like the Sim standing up, without any weird rotations on the back) and the toe bones aren't below the feet like Milkshape 3D's is.