What are the top tips for rig blend shapes 3D models?

When creating rig blend shapes for 3D models, prioritize a clean base mesh, non-overlapping shapes, early interpolation testing, and starting simple. A clean base (consistent topology, no extra edges) prevents blending glitches. Non-overlapping shapes—like separate eye squints and mouth smiles—avoid conflicting movements. Early testing catches unnatural transitions before adding complexity. For beginners, start with simple expressions (e.g., a basic smile or blink) to master these tips before tackling complex shapes.