This paper describes a new hair representation technique for drawing 3D CG characters. In our approach hair models are represented by skeleton-based implicit surfaces. Implicit modeling allows representing union and division of wisps of hair by using a blobby model. Our method gets hair skeletons as input data. The skeleton is interpolated using a spline function and then implicit surface of hair shape is generated by the skeleton. And ray marching method is used to compute intersection of ray and surface of hair implicite function. Finally, non-photorealistic rendering is applied to generate resulting image as output. In our approach hair skeletons are created by operating GUI skeleton editor or tracking hand motion using depth camera. This system allows the artist to create skeleton with the help of intuitive operations. Physically-based animation of the hair model is also proposed. In our approach, spring-mass model is used to animate a solid hair shape.

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