Generalized Resampled Importance Sampling: Foundations of ReSTIR
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Technical Paper
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Research & Education
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DescriptionWe generalize resampled importance sampling (RIS) to correlated samples from different domains without needing to know exact PDFs. This solidifies the theoretical foundation of ReSTIR and allows deriving an unbiased ReSTIR path tracer that reuses difficult light paths between pixels and frames by context-aware shift mappings.