光线跟踪算法在织物CAD中的应用

根据织物的组织、纱线的结构以及花纹图案对织物进行仿真模拟是织物CAD系统的主要功能之一,为了在真实感方面进一步提高仿真效果,将光线跟踪技术用于织物CAD系统中,把二维平面效果图变成三维立体效果图,并在跟踪过程中引入跟踪深度和衰减指数的概念提高算法效率,针对纺织品的特点建立非折射透明模型,运用光线跟踪算法模拟织物表面的反射、透射以及阴影等光照效果,并通过场景造型、光照计算以及纹理、反走样等技术的综合运用,获得较好的视觉效果。

Application of ray tracing algorithm on the fabric CAD

It is one of the main functions of fabric CAD system to simulate the fabric according to its yarn structure,weaves and patterns.To acquire more effective and realistic simulation,this thesis transforms the rendered drawing from 2-D to 3-D, and introduces trace depth and the concept of attenuating exponential in the process of ray tracing.The preferable visual effect has been obtained by setting up a non-refraction transparence model according to the characteristics of the fabric,using the ray tracing technique to simulate the reflection,transmission and shadow of the fabric surface,and applying such techniques as scene sculpt, illumination calculation,texture,anti-deformation,etc.