真实感体绘制中的光照与阴影模型算法研究  

Algorithm for Illumination and Shadow Model in Realistic Volume Rendering

作　　者：孟祥艳[1] 任郁苗[1] 潘海仙[1] 

机构地区：[1]西安工业大学电信学院,西安710000

出　　处：《激光杂志》2016年第8期141-144,共4页Laser Journal

基　　金：陕西教育厅专项科研计划项目(14JK1341)

摘　　要：真实感是三维重建中非常重要的因素,而绘制真实感模型需要进行光照与阴影的渲染。本文提出在局部光照组合模型的基础上采用基于光线遮挡的多层阴影地图的映射方法作为数据深度信息的增强处理。实验结果显示,此方法极大消除了边缘的锯齿现象,阴影效果柔和,与传统方法相比,算法运行时间少,速度快。本文算法在很大程度上改善了绘制质量,呈现更明显的立体效果,使绘制结果更接近于真实情况,并且计算量小,算法简单。The sense of reality is a very important tactor in the 3D reconstruction, and the drawing of the realistic model needs illumination and shadow tendering. A new local illumination model was proposed in this paper. On this basis, multi-layer shadow mapping method based on light shielding was submitted to enhance depth perception. The experimental results showed that this method greatly eliminates the aliasing phenomenon of the edge, and the shadow effect is soft. Companed with traditional algorithms, the algorithm we proposed improved the quality of drawing, and showed a more obvious three-dimensional effect. The result of rendering is closer to the real situation, the amount of calculation is small, and the algorithm is simple.

关 键 词：体绘制 光照模型 阴影地图 光线遮挡 光线跟踪 

分 类 号：TN911[电子电信—通信与信息系统]