A frequency analysis of light transport
ACM SIGGRAPH 2005 Papers
ACM SIGGRAPH Asia 2008 papers
Adaptive progressive photon mapping
ACM Transactions on Graphics (TOG)
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We present an extension to Hachisuka et al.'s Progressive Photon Mapping (or PPM) algorithm [Hachisuka et al. 2008] in which we estimate the radius of the density estimation kernels using frequency analysis of light transport [Durand et al. 2005]. We predict the local radiance frequency at the surface of objects, and use it to optimize the size of the density estimation kernels, in order to accelerate convergence. The key is to add frequency information to a small proportion of photons: frequency photons. In addition to contributing to the density estimation, they will provide frequency information.