DARTS: Diffusion Approximated Residual Time Sampling for Low Variance Time-of-flight Rendering in Homogeneous Scattering Medium
CoRR(2024)
摘要
Time-of-flight (ToF) devices have greatly propelled the advancement of
various multi-modal perception applications. However, due to complexity in both
sampling path construction and vertex connection in time domain, it is
extremely challenging to accurately render time-resolved information in ToF
device simulation, particularly in scenes involving complex geometric
structures, diverse materials and volumetric scattering media. Existing works
either exhibit significant bias or variance in ToF rendering tasks or prove
ineffective in scenes involving participating media and camera-warped settings.
To address this challenge, in this paper, we integrate the transient diffusion
theory into path construction to generate the unbiased full transport of
time-resolved radiance. Additionally, we devise an elliptical sampling method
to provide controllable vertex connection satisfying any required photon
traversal time. To our knowledge, our work is the first to explore importance
sampling according to transient radiance, enabling temporal path construction
of higher quality in multiple scattering settings. Extensive experiments show
that our sampling method can significantly improve both quality and efficiency
of ToF rendering within both path tracing and photon-based frameworks, with at
least a 5x MSE reduction versus SOTA methods in equal rendering time. Our
method introduces no memory overhead and negligible extra computation compared
to the boost in speed, providing a straightforward plug-in for various existing
rendering frameworks.
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