渐进式光辐射强度估算方法研究

Research on Radiance Estimation of Progressive Photon Mapping

光子映射能较好地渲染焦散、辉映现象,光辐射强度估算是其中重要的技术。新方法采用渐进式光子映射算法(PPM),先简化光辐射强度估算半径的方式,接着从理论上证明在发射多轮光子后光辐射强度误差的平均期望值及平均方差会随着光子数的增加而减少。实验显示采用新方法光辐射强度的估算精度逐步提高,渲染更清晰的图形。

Photon mapping is used to render caustic effectively, the estimation of radiance is a key technology in photon mapping algorithm. Adopts the Progressive Photon Mapping （PPM） method, firstly simplifies the estimation radius of radiance, and proves that the average expectation and average variance of radiance error will decrease. The experimental results show that the novel algorithm is faster than PPM algorithm and also improves image quality.