Common mistakes when creating hair blend shapes for 3D models include overcomplicating targets, ignoring base mesh compatibility, and neglecting volume consistency.
Overcomplicating means adding too many unnecessary subtle shapes, which complicates rigging and slows animation. Ignoring base mesh compatibility causes glitches—blend shapes must match the base hair’s topology and UVs to work smoothly. Neglecting volume leads to unnatural shrinking or expanding when blend shapes (like wind or movement) are applied, breaking realism.
For beginners, start with 3–5 key targets (e.g., side sweep, front lift) and test early in the rig. This fixes compatibility or volume issues before adding details, keeping your workflow efficient.