The advanced features also give rise to a high degree of expressiveness of the virtual brush that the user can comfortably manipulate. Compared with other virtual brushes, this new system is designed to present a realistic brush in the sense that the system accurately and stably simulates the complex painting functionality of a running brush, and therefore is capable of creating high-quality digital paintings with minute aesthetic details that can rival the real artwork. A prototype system has been implemented based on this framework. The framework comprises the following components: a geometric model of the brush using a hierarchical representation that leads to substantial savings in every step of the painting process fast online brush motion simulation assisted by offline calibration that guarantees an accurate and stable simulation of the brush’s dynamic behavior a new pigment model based on a diffusion process of random molecules that considers delicate and complex pigment behaviors at dipping time as well as during painting and a user-adaptation component that enables the system to cater for the personal painting habits of different users. In this part of the book, we propose a novel algorithmic framework for an advanced virtual brush to be used in interactive digital painting.
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