在Vega中实现基于PCF算法的反走样阴影  

Realizing anti-aliasing shadow in Vega basing on PCF algorithm

作　　者：顾文彬[1] 郑向平[2] 涂国勇[2] 张建勋[2] 朱敏[2] 

机构地区：[1]解放军理工大学野战工程学院,江苏南京210007 [2]酒泉卫星发射中心,甘肃酒泉732750

出　　处：《解放军理工大学学报（自然科学版）》2012年第6期615-619,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

摘　　要：为了解决基于Vega平台进行虚拟现实开发时的阴影绘制和阴影优化难题,通过剖析阴影生成技术,利用Vega的回调机制,调用OpenGL实现了Vega环境中的实时阴影绘制。由于深度纹理的分辨率不够,造成了阴影边缘的锯齿状走样,通过PCF算法来增加阴影边缘的采样率,可以得到边缘模糊的反走样阴影。在Vega中通过GLSL语言,编写顶点处理和着色片元程序。利用GPU阴影映射硬件的加速性能,实现了边缘优化的实时反走样阴影。实践证明,基于PCF算法的反走样阴影满足基于Vega平台进行虚拟现实开发的要求,能大大提升虚拟现实应用的沉浸感和真实感。The shadow mapping and shadow generation techniques were analyzed, and the real-time shadow rendering in Vega environment realized through the implementation of OpenGL and the use of Vega＇s call- back mechanism. The reasons for the shadow aliasing were analyzed and percentage-closer filtering（PCF） algorithm introduced. Real-time anti-aliasing shadow in Vega was realized by using the acceleration func- tion of graphic processing unit（GPU） hardware. The problems about shadow drawing and shadow optimi- zation were solved at the beginning of virtual reality based on Vega platform, which greatly enhances the immersion and realism of the virtual reality application.

关 键 词：VEGA 反走样阴影 PCF 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]