Strokes role important parts of expression in especially scratchy paintings, Indian ink painting and oriental calligraphy. To draw them on computer, therefore, input for subtle and various strokes should be prepared. However, strokes input techniques in current painting tools' brushes are almost based on a disc track or an air brush. Their expression is limited comparing with real brushes in the world which can draw subtly and variously. There are some studies to develop the expression. However their stroke input methods are not same as in the real world manner and are not easy. This paper describes a flovel three dimensional physics based brush model which is controllable intuitively by natural operations with pen tablet device and which allows high expressive strokes. Painting results on our experimental painting tool based on the brush model show that the model enables to draw novel type strokes on computer and allows subtle operation.
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