全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

层次结构辐射度渲染中的可见性测试

DOI: 10.11834/jig.2002011347

Keywords: 可见性测试,辐射度渲染,集簇,层次结构辐射度,光线投影,Shaft,Culling算法,优化技术,计算机图形学

Full-Text   Cite this paper   Add to My Lib

Abstract:

在辐射度渲染等整体光照模型中,可见性测试是影响整体性能的关键,为了获得较好的可见性测试效果,在光线投射方法基础上,对可见性测试方法做了如下两方面的优化,一方面引入ShaftCulling算法,作首轮筛选,以提高线投射的效率,另一方面,在可见性测试和自适应分割时,进行基于可见性的分割,以保证只有完全可见和完全不可见两种情况,这两方面优化都被引入到层次结构辐射度渲染的实现中,实验结果表明,改进过的可见性测试,不仅减少了计算量和误差,还保证了阴影边界的质量。

References

[1]  [1]Gibson S, Hubbold R J. Efficient hierarchical refinement and clustering for radiosity in complex environments[J]. Computer Graphics Forum, 1996,15(5):297~310.
[2]  [3]Wallace J R, Elmquist K A, Haines E A. A ray tracing algorithm for progressive radiosity[A]. In:Computer Graphics (SIGGRAPH\'89 Proceeding.) [C], Boston U. S. A: Addison Wesley, 1989,23:315~324.
[3]  [5]Drettakis G, Fiume E. A fast shadow algorithm for area light sources using backprojection [A]. In: Proceedings of SIGGRAPH\'94 Annual Conference Series [C], Darmstadt Germany, 1994:223~230.
[4]  [7]Haines E A, Wallace J R. Shaft culling for efficient ray-traced radiosity [A]. In: Photorealistic Rendering in Computer Graphics (Proceedings of the Second Eurographics Workshop on Rendering) [C], New York: Springer-Verlag, 1994:122~138.
[5]  [2]Sillion F, Drettakis G, Soler C. A clustering algorithm for radiance calculation in general environments[A]. In:Proceedings of Eurographics Rendering workshop 1995 [C], New York:Springer-Verlag, 1995:196~205.
[6]  [4]Schaufler G, Dorsey J, Decoret X et al. Conservative volumetric visibility with occluder fusion [A]. In: Proceedings of SIGGRAPH 2000 Annual Conference Series[C], Boston, USA:Addison Wesley, 2000:229~238.
[7]  [6]Durand F, Drettakis G, Puech C. The visibility skeleton: A powerful and efficient multi purpose global visibility tool[A].In: Proceedings of SIGGRAPH\'97 [C], St. Etienne France,1997:89~100.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133