基于可视区域间接光照聚类的虚拟点光源采样

doi:10.16182/j.issn1004731x.joss.18-VR0742

系统仿真学报 ›› 2020, Vol. 32 ›› Issue (6): 1085-1093.doi: 10.16182/j.issn1004731x.joss.18-VR0742

基于可视区域间接光照聚类的虚拟点光源采样

陈胜, 陈纯毅^*, 邢琦玮, 杨超智

长春理工大学计算机科技术学院，吉林长春 130022

收稿日期:2018-11-05 修回日期:2018-11-26 发布日期:2020-06-25
作者简介:陈胜(1993-)，男，湖南，硕士生，研究方向为三维图形绘制；陈纯毅(通讯作者1981-)，男，重庆，博士，教授，研究方向为三维图形绘制。
基金资助:
国家自然科学基金(U19A2063)，吉林省科技发展计划(20170101005JC，20180519012JH)，吉林省教育厅项目(JJKH20170629KJ，JJKH20200792KJ)

Virtual-Point-Light Sampling Algorithm Based on Indirect Illumination Clustering of Visible Scene Region

Chen Sheng, Chen Chunyi^*, Xing Qiwei, Yang Chaozhi

School of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China

Received:2018-11-05 Revised:2018-11-26 Published:2020-06-25

摘要/Abstract

摘要： 针对间接光照计算精度问题，提出改进的可视区域敏感的虚拟点光源采样方法。设计依据可视场景点位置及其法向量对可视场景点进行聚类的方法;计算虚拟点光源对各类中心位置对应可视场景点的光照贡献与类中可视场景点个数之积的累加和，并把累加和作为该虚拟点光源对可视区域的间接光照贡献估计值；以此估计值构造累积概率分布函数，据此选取实际计算每个可视场景点间接光照时所用的虚拟点光源。实验结果表明，该方法能够以较少虚拟点光源实现真实感强的间接光照效果绘制，提高间接光照计算精度。

关键词: 虚拟点光源, 可视场景点聚类, 间接光照, 重要性采样

Abstract: Focusing on the accuracy of indirect illumination calculation, an improved view-sensitive virtual point light (VPL) sampling method is proposed. The visible shading points are clustered according to the positions and normal vectors. The product of the contribution of VPLs on the representative visible shading points and the number of VPLs belonging to the same class is calculated, and the sum of the products is treated as the estimation of the indirect illumination which constructs the cumulative distribution function (CDF). On the basis of the CDF, the VPLs of calculating the indirect illumination on every visible shading point are selected. Experiment results show that the proposed algorithm can achieve better indirect lighting effect with fewer VPLs, and improve the accuracy of indirect illumination calculation.

Key words: virtual point light, visible shading point clustering, indirect illumination, importance sampling

中图分类号:

TP314

陈胜, 陈纯毅, 邢琦玮, 杨超智. 基于可视区域间接光照聚类的虚拟点光源采样[J]. 系统仿真学报, 2020, 32(6): 1085-1093.

Chen Sheng, Chen Chunyi*, Xing Qiwei, Yang Chaozhi. Virtual-Point-Light Sampling Algorithm Based on Indirect Illumination Clustering of Visible Scene Region[J]. Journal of System Simulation, 2020, 32(6): 1085-1093.

参考文献

[1] Keller A. Instant radiosit[C]. Proceedings of the 24th annual conference on Computer Graphics and Interactive Techniques. New York: ACM Press, 1997: 49-56.
[2] Dachsbacher C, Krivanek J, Hasan M, et al. Scalable Realistic Rendering with Many-Light Methods[J]. Computer Graphics Forum (S1467-8659), 2014, 33(1): 88-104.
[3] Simon F, Hanika J, Dachsbacher C. Rich-VPLs for Improving the Versatility of Many-Light Methods[J]. Computer Graphics Forum (S1467-8659), 2015, 34(2): 575-584.
[4] Georgiev I, Slusallek P. Simple and Robust Iterative Importance Sampling of Virtual Point Lights[C]. Proceeding of Eurographics (Short Papers). Geneva: Eurographics Association, 2010: 57-60.
[5] Davidovic T, Krivanek J, Hasan M, et al. Combining global and local virtual lights for detailed glossy illumination [J]. ACM Transactions on Graphics (S0730-0301), 2010, 29(6): 143-150.
[6] 金师豪, 王锐, 郑文庭, 等. 一种侧重近景区域间相互光照的虚拟点光源混合生成方法[C]// 第十届中国计算机图形大会暨第十八届全国计算机辅助设计与图形学会会议论文集. 武汉: 中国计算机学会, 2014: 9-16.
Jin Shihao, Wang Rui, Zheng Wenting, et al. A hybrid generation method of Virtual Point Light Sources focusing on mutual illumination between close-range regions[C]// Proceedings of the 10th conference on China Computer Graphics and the 18th conference on Computer Aided Design and Computer Graphics. Wuhan: China Computer Federation, 2014: 9-16.
[7] Hasan M, Pellacini F, Bala K, et al. Matrix row-column sampling for the many-light problem[J]. ACM Transactions on Graphics (S0730-0301), 2007, 26(3): 26.
[8] Huo Y, Wang R, Jin S, et al. A matrix sampling and recovery approach for many lights rendering[J]. ACM Transactions on Graphics (S0730-0301), 2015, 34(6): 1-12.
[9] Nalbach O, Ritschel T, Seidel H, et al. The Bounced Z-buffer for Indirect Visibility[C]. Proceeding of Vision, Modeling and Visualization. Geneva: Eurographics Association, 2015: 79-86.
[10] Wang L, Liang X, Meng C, et al. Fast Ray-Scene Intersection for Interactive Shadow Rendering with Thousands of Dynamic Lights[J]. IEEE Transactions on Visualization and Computer Graphics (S1077-2626), 2019, 25(6): 2242 - 2254.
[11] Dachsbacher C, Stamminger M. Reflective shadow maps[C]. Proceeding of Symposium on Interactive 3D Graphics and Games. New York: ACM Press, 2005: 203-231.
[12] Prutkin R, Kaplanyan A S, Dachsbacher C, et al. Reflective Shadow Map Clustering for Real-Time Global Illumination[C]. Proceeding of Eurographics (Short Papers). Geneva: Eurographics Association, 2012: 9-12.
[13] 陈纯毅, 杨华民, 李文辉, 等. 基于帧间虚拟点光源重用的动态场景间接光照近似求解算法[J]. 吉林大学学报(工学版), 2013, 43(5): 1352-1358.
Chen Chunyi, Yang Huaming, Li Wenhui, et al. Appropriate algorithm for computing indirect illumination of dynamic scenes based on inter-frame reuse of virtual point lights[J]. Journal of Jilin University (Engineering and Technology Edition), 2013, 43(5): 1352-1358.
[14] Pharr M, Humphreys G. Physically Based Rendering: From Theory to Implementation[M]. Burlington, USA: Morgan Kaufmann Publishers Inc, 2010.
[15] Chen C Y, Yang H M, Li H. Interactive rendering of approximate soft shadows using ray tracing with visibility filtering[C]. International Conference on Computer Science, Technology and Application. Singapore: World Scientific Publishing, 2016: 68-74.
[16] Dong Z, Grosch T, Ritschel T, et al. Real-time Indirect Illumination with Clustered Visibility[C]. Proceeding of the Vision, Modeling, and Visualization Workshop. Geneva: Eurographics Association, 2009: 187-196.

基于可视区域间接光照聚类的虚拟点光源采样

Virtual-Point-Light Sampling Algorithm Based on Indirect Illumination Clustering of Visible Scene Region

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