This paper presents a real-time approach to render 3D scenes with the effects of watercolor on GPU. Most processes of the approach are implemented with image-space techniques. Our algorithm renders detail layer, ambient layer and stroke layer separately, and then combines them into final result. During the rendering processes, screen space ambient occlusion and shadow mapping are used to compute shadow in much shorter time, and image filter approach is used to simulate important effects of watercolor. Because our approach is mainly implemented with image-space techniques, it is convenient to use GPU to accelerate the rendering processes and finally our approach achieves real-time speed. A system is also setup to play scripts and output real-time animation, which indicates that this approach can be extended to diverse applications such as computer animation, game and other multimedia entertainment industries.%论文提出了一种基于GPU的对三维场景进行实时水彩画效果渲染的方法.该方法的大部分过程使用图像空间的技术实现.算法将画面分为细节层、环境层、笔触层分别渲染,再进行合成.在过程中使用环境遮挡、shadow mapping等技术进行快速的阴影计算,并使用图像滤镜的方法模拟水彩的多种主要特征.由于该方法以图像空间的技术为主,因此可以利用GPU并行处理的特点对计算过程进行加速,进而达到实时的渲染速度.最后建立动画脚本分析系统,进行实时动画渲染,表明该方法在计算机动画、游戏等数字娱乐产业领域有较大的应用潜力.
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