Abstract: Shadow Mapping approach is one of the most widely used way of shadow generation，but it usually suffers from aliasing problem，and can not meet the requirement of reality and real-time performance in the shadow generation of large-scale scene.So，this paper proposes an improved method based on Shadow Mapping，which can produce real-time shadowing effects with less texture memory but significant improvement of shadow qualities，especially for the dynamic and large-scale virtual environments.The improved algorithm is implemented in VS2005 and OpenSceneGraph，and it can satisfy the requirement of quality and real-time performance.

Key words: Shadow Mapping, large-scale, virtual, split

摘要： Shadow Mapping算法是目前广泛应用的阴影渲染方法，但该方法容易产生走样，特别是不能满足大规模场景中阴影的真实性和实时性要求。对此，提出一种利用平行面分割的改进Shadow Mapping算法，减少了算法运行时的缓冲空间，提高了阴影质量，尤其适合于动态大规模环境中实时阴影的生成。并用VS2005和OpenSceneGraph实现了算法的绘制过程，达到满意的视觉效果和生成速度。

关键词: 阴影映射（Shadow Mapping）算法, 大规模, 虚拟, 分割