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基于均匀网格的动态多光源直接光照

Uniform Grid-Based Dynamic Many-Light Direct Lighting
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摘要 为了渲染含大量动态光源的场景,提出一种层次重采样算法.首先提出一种稀疏八叉树的实时重建策略,通过并行排序和合并加速其重建;然后通过自顶向下遍历稀疏八叉树,对以均匀网格离散化表示的空间进行高效采样;最后,为了提高渲染质量,对该空间内的均匀网格进行重采样.在ORCA和自建场景下的实验结果表明,所提算法能够较好地在渲染效率和质量间取得平衡,采样和渲染质量优于随机光源裁剪算法,而且渲染结果质量相近时,所提算法采样开销可减少约50%. A hierarchical resampling algorithm is presented for rendering scenes with many dynamic lights.Firstly,a strategy for sparse octree parallel reconstruction is proposed,which accelerates reconstruction by parallel sorting and merging.Then,with top-down sparse octree traversal,the space is efficiently sampled which discretely represented by uniform grids.Finally,rendering quality is improved by resampling grids in sampled space.The experimental results in ORCA and self-building scenes indicate that the proposed method can achieve a good balance between the rendering performance and quality.Comparing with real-time stochastic lightcuts algorithm,the proposed algorithm achieves better sampling and rendering quality.And when rendering results have similar quality,the sampling consumption is reduced by about 50%.
作者 陈健蔚 刘昊峰 刘艳丽 张严辞 Chen Jianwei;Liu Haofeng;Liu Yanli;Zhang Yanci(College of Computer Science,Sichuan University,Chengdu 610065;National Key Laboratory of Fundamental Science on Synthetic Vision,Sichuan University,Chengdu 610065)
出处 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2022年第5期784-793,共10页 Journal of Computer-Aided Design & Computer Graphics
基金 国家重大项目(GJXM92579)。
关键词 多光源 层次采样 重要性采样 光线跟踪 实时渲染 many lights hierarchical sampling importance sampling ray tracing real-time rendering
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