Abstract: Particle system is a graph generation algorithm which can efficiently simulate the sceneries and phenomena characterized by irregular motion.Combining the key techniques of particle system and the OpenGL texture mapping technology，this paper designs a simulation algorithm of watercolor，the system user uses a mouse to interact with the system.This algorithm simulates pigment particle using texture mapping technology，realizes watercolor simulative process through particle diffusion.The simulation results show that this algorithm is simple，fast，and achieves high fidelity.

Key words: non-photorealistic rendering, particle system, texture mapping rendering, realization of watercolor

摘要： 粒子系统是一种可以有效模拟不规则运动的景象或现象的图形生成算法。将粒子系统的关键方法和OpenGL纹理映射技术相结合，设计了一种水彩画的模拟生成算法，利用鼠标实现用户交互。该算法利用纹理映射技术模拟颜料粒子，通过粒子的扩散作用模拟水彩画的绘制过程。实验结果表明，提出的水彩画模拟算法具有简单快速的特点，并且达到了较好的逼真度。

关键词: 非真实感绘制, 粒子系统, 纹理映射绘制, 水彩画仿真