自然雪景的构造和绘制

合成高度复杂自然场景一直是计算机图形学中的一个富有挑战性的课题。生成雪景或许更加困难，因为利用常用的造型工具，比如多边形和曲面来表达雪的形状非常不方便。该文介绍一种解决这个问题的方法，这种方法采用位移映射（displacement mapping）来构造近处由多边形构造的物体上的雪块，而体纹理映射（volumetric texture mapping）被用来处理远处的复杂物体，比如树木。绘制结果显示，这种方法能够在较少的内存和计算开销的基础上绘制出高度复杂和真实的雪景。

Modeling and Rendering Snowy Natural Scenery

Realistic image synthesis of high complex natural scenes has been always a challenging topic in computer graphics. Generation of snow scenes could be even more difficult due to the inconvenience of using common modeling elements, such as polygons and curved surfaces, to express the snow shape. This paper introduces an approximate method to solve the problem. By the method, displacement map is used to model snow block on near objects, constructed from polygons, while volumetric texture map is introduced to handle the objects in distance like trees. Test result shows that the method is viable in producing realistic snow scenes with comprehensive object environments, in a favorable requirement of storage and rendering computation.