Your face 3D model breaks during manual rigging usually due to uneven weight painting, misaligned facial joints, or topology that doesn’t support smooth deformations.
- **Uneven weight painting**: Some vertices get too much (stretching) or too little (gaps) joint influence. - **Misaligned joints**: Placing joints (e.g., jaw) in unnatural spots forces awkward bends. - **Poor topology**: Triangles instead of clean quads prevent smooth mesh bending.
To fix it, use a weight painting tool to smooth vertex influences, align joints to natural points (like the jaw hinge), and use quad-dominant topology before rigging.