Tag: Rendering
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Hemisphere Sampling or Spherical Sampling: A Small Detail of Importance Sampling the Poisson Kernel in Walk on Boundary
In WoBToolbox, there is a seemingly puzzling step when sampling this term: the author uses uniform hemisphere sampling to generate rays, and this hemisphere is not aligned with the geometric normal of the boundary.
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Guiding-Based Importance Sampling for Walk on Stars
Walk on stars (WoSt) has shown its power in being applied to Monte Carlo methods for solving partial differential equations, but the sampling techniques in WoSt are not satisfactory, leading to high variance. We propose a guiding-based importance sampling method to reduce the variance of WoSt. Drawing inspiration from path guiding in rendering, we approximate…