How to retopologize blend shapes 3D models for VTubers?

To retopologize blend shapes for VTuber 3D models, focus on preserving the base mesh’s topology and matching vertex count/flow between the base and blend shapes—this ensures smooth, consistent facial animations critical for VTuber expressions. Align edge loops with key expressive areas (eyes, mouth) using tools like Blender’s Retopology tools; this supports natural deformation where VTuber interactions rely most. Test frequently: Check how blend shapes interact with the base mesh to fix misalignments that break core movements (e.g., smiles, blinks). Start simple: Practice with basic shapes (blink, slight smile) first—master edge flow here before complex expressions to ensure compatibility with VTuber rigs. By keeping topology consistent and testing early, you’ll create blend shapes that integrate seamlessly with live VTuber setups, maintaining natural, usable expressions.