3D实用毛笔模型的物理仿真

从水墨画成画机理出发提出一个实用的3D毛笔模型系统，精确模拟毛笔几何形态及运动弯曲等动态交互行为．提出势能一阈值方法以灵活控制毛笔形变的弹塑性转化及扭转程度．采用快速分叉算法，随机生成真实感很强的毛笔分叉效果．结合3D毛笔模型和虚拟宣纸模型设计了水墨扩散传输算法，从而形成完善的水墨成画机制．上述方法可有效仿真艺术创作过程中毛笔的动态变化，实现单笔扩散、多笔次叠加和干笔飞白等数字水墨特效．

Physical Simulation of Practical 3D Brush Model

A practical 3D brush model system was put forward from ink-water drawing principle to accurately simulate geometry states and interactive behavior of brush. A potential energy-threshold method was introduced to control the transformation from elastic deformation to plastic deformation and the turning degree of blush. Fast forking algorithm ensured the realistic branching effect of brush. A water-ink transmission algorithm was devised with the combination of 3D brush model and virtual paper model, which made a perfect water-ink painting mechanism, All methods above simulate the dynamic change of brush effectively during art creation process, and realize digital waterink effects such as single stroke diffusion, multi-stroke overlapping and half-dry.