Abstract
In the painterly rendering, the direction of the brush stroke is a very important factor. We propose a technique for automatic generation of ideal stroke direction reflecting the feature of the object. Our technique generates the stroke direction using 3D thinning of the object. As this technique specifies the direction on the 3D surface, it is suitable for animation. We also implemented suiboku-ga-style rendering using our technique. We specifies the starting points of strokes on the 3D surface in addition to the stroke direction. By doing so, our rendering algorithm can generate not only a still picture but also the animation with little flickering in suiboku-ga style. We believe that our stroke direction specification algorithm can also be applied to other NPRs such as pencil sketch drawing.
