Sketch interface based expressive hairstyle modelling and rendering

We present a new system for interactively modeling and rendering nonphotorealistic hairstyles. The system is featured with a user-friendly sketch interface allowing a user generate his/her desired hairstyle simply by drawing a few free-form strokes. Hairstyles are modeled with a new polygon based technique called cluster polygon, and can be rendered expressively to obtain hair images similar to those found in cell animation and cartoons.