Below you can find interactive versions of the image comparisons in Figures 8 and 9 of the paper "A bidirectional formulation for Walk on Spheres".
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We compare forward WoS (left) to reverse WoS (right) at equal time with few samples (top) and with 16× as many samples (bottom). Reverse WoS produces a smooth result even with few samples, converging more quickly than forward WoS.
Here we perform an equal-time comparison of forward vs. our reverse WoS on a scene with three sparse sources and zero boundary conditions. Compared to the converged reference, our approach with only 4e4 sampled paths produces visually better results than forward WoS with 3.24e6 total paths.