Chinese Hairy Brush: A physically-based model for calligraphy

This paper presents a physically-based virtual Chinese hairy brush model which can be used as a digital tool for learning or creating Chinese calligraphy or Chinese painting. The whole framework of the proposed method comprises three components, i.e., brush geometry model, brush dynamic model and ink model. Instead of simulating the brush with bristles, our geometry model uses points to simulate the whole brush bundle, which can drastically decrease the complexity inherent in the conventional bristle-level approach. The dynamic model describes the behavior of the real brush's deformation in terms of the interaction of the external and internal forces with the virtual writing paper, and a spring network is derived to calculate the physical deflection of brush according to the force exerted on it. The ink model describes the process of ink depositing in which brush geometry model is instanced and transformed into a real screen presentation.