(translated roughly as “Touch/Grope JK” – with JK referring to joshi kōsei , or high school girl) represents a subgenre of interactive Live2D implementations where the user can directly click, drag, or “touch” specific body parts of a Live2D character, triggering reactive animations, audio, and parameter changes.
This write-up analyzes the technical structure, parameter mapping, and logic flow behind these systems. A standard Live2D OsawariJK implementation extends the official Cubism SDK (typically for Unity or Native Web/JavaScript ) with custom input handling and state management. 2.1 Parameter Mapping for Interactivity Unlike standard models (which animate parameters via time or lip-sync), OsawariJK models map specific drawable regions to parameter IDs for reactive deformation. live2d osawarijk
| Body Region | Parameter ID | Deformation Behavior | |-------------|--------------|----------------------| | Head (pat) | ParamAngleX | Slight rotation + blush intensity | | Chest (touch) | ParamBreastL/R | Squash/stretch based on drag delta | | Hip (drag) | ParamHipSqueeze | Horizontal/vertical compression | | Eye (poke) | ParamEyeOpen | Rapid close/open (wink + shock) | In the .model3.json or through Unity’s CubismHitDrawable , developers define invisible colliders attached to specific drawable IDs. These are not for physics – they are for input raycasting. (translated roughly as “Touch/Grope JK” – with JK
Example parameter mapping: