基于次表面散射的肝脏高真实感实时渲染的研究与实现  

Research and implementation of real-time rendering of liver based on sub-surface scattering

作　　者：吴德道 刘小平[1,3] WU Dedao;LIU Xiaoping(School of Information Engineering,Nanchang University,Nanchang,Jiangxi,China 330031;Jingdezhen ceramics university,Jingdezhen,Jiangxi,China 333000;Department of System and Computer Engineering,Carleton University,Ottawa K1S 5B6,Canada)

机构地区：[1]南昌大学信息工程学院,江西南昌330031 [2]景德镇陶瓷大学,江西景德镇333000 [3]卡尔顿大学系统与计算机工程系,渥太华加拿大K1S5B6

出　　处：《南昌大学学报（理科版）》2020年第5期482-491,共10页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(61862044);江西省自然科学基金面上项目(20192BAB207015);江西省自然科学基金重点项目(20171ACB20007)。

摘　　要：针对人体肝脏的高真实感实时渲染问题,提出了一种采用表面反射和次表面散射两种光照模型组合的解决方法。首先对表面反射光照模型采用环境照明、漫反射照明、高光照明、法线贴图和阴影贴图等技术模拟表面光照视觉效果;利用次表面散射和透射结合的方法模拟光在肝脏组织中传播和穿透,并用两个一维卷积来呈现次表面散射,以减少执行时间与内存消耗,从而得到一个基于次表面散射模型的真实感呈现。实验结果表明,所提出的方法能实现肝脏高真实感渲染,并可达到90帧每秒的帧渲染速率。In order to solve the problem of high realistic rendering of human liver,a method based on the combination of surface reflection and subsurface scattering is presented.Firstly,thesurface reflection lighting model uses ambient lighting,diffuse lighting,highlight lighting,normal maps and shadow maps to simulate the visual effect of surface lighting.The propagation and transmission of light in liver tissue are simulated by combining subsurface scattering and transmission.Also,two one-dimensional convolutions are used to present subsurface scatteringand to reduce execution time and memory consumption,giving rise to a realistic rendering based on subsurface scattering model.Experimental results show that the proposed method can achieve high realistic rendering of liver and achieve a real time rendering frame rate of 90 frames per second.

关 键 词：次表面散射 实时渲染 透射 半透明阴影映射 双向表面散射反射分布函数 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]