To weight paint 3D models for VTubing, use a tool like Blender to assign vertex weights—linking mesh areas to rig bones—for natural movement (e.g., facial expressions, arm bends).
- **Why it matters**: Weight painting controls how vertices follow bones. For VTubers, this avoids "pinching" (e.g., mouth movements) and keeps textures aligned during animations. - **Beginner steps**: Start with simple areas (jaw, hands) in Blender’s Weight Paint mode. Use soft brushes to blend weights, then preview with the armature to tweak for smooth deformations.