Efficient real-time dynamic diffuse global illumination using signed distance fields

Hu, Jinkai; Yip, Milo K.; Alonso, G.; Gu, Shihao; Tang, Xiangjun; Jin, Xiaogang

doi:10.1007/s00371-021-02197-0

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…These methods rely on encoding transport using textures (lightmaps) which involves important choices surrounding discretization and representation using bases. Recent trends in realtime global illumination also show the implicit usage of low rank approximations of T in the form of basis functions [Koskela et al 2019] or probes [Hu et al 2021;Majercik et al 2019]. Another recent area is the use of neural networks to encode radiance in a scene [Mildenhall et al 2020], for which the impact of discretization (sampling) is not well studied.…”

Section: Discussionmentioning

confidence: 99%

A Theoretical Analysis of Compactness of the Light Transport Operator

Soler

Molazem

Subr

2022

Special Interest Group on Computer Graphics and Interactive Techniques Conference Proceedings

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Rendering photorealistic visuals of virtual scenes requires tractable models for the simulation of light. The rendering equation describes one such model using an integral equation, the crux of which is a continuous integral operator. A majority of rendering algorithms aim to approximate the effect of this light transport operator via discretization (using rays, particles, patches, etc.). Research spanning four decades has uncovered interesting properties and intuition surrounding this operator. In this paper we analyze compactness, a key property that is independent of its discretization and which characterizes the ability to approximate the operator uniformly by a sequence of finite rank operators. We conclusively prove lingering suspicions that this operator is not compact and therefore that any discretization that relies on a finite-rank or nonadaptive finite-bases is susceptible to unbounded error over arbitrary light distributions. Our result justifies the expectation for rendering algorithms to be evaluated using a variety of scenes and illumination conditions. We also discover that its lower dimensional counterpart (over purely diffuse scenes) is not compact except in special cases, and uncover connections with it being noninvertible and acting as a low-pass filter. We explain the relevance of our results in the context of previous work. We believe that our theoretical results will inform future rendering algorithms regarding practical choices.CCS Concepts: • Computing methodologies → Rendering; • Mathematics of computing → Functional analysis; Integral equations.

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Section: Discussionmentioning

confidence: 99%

A Theoretical Analysis of Compactness of the Light Transport Operator

Soler

Molazem

Subr

2022

Special Interest Group on Computer Graphics and Interactive Techniques Conference Proceedings

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“…Introduction of HWRT thus becomes a complex balancing exercise where engineers need to maintain the required frame-rates by designing algorithms that use small numbers of HWRT queries. When a rendering technique requires more ray queries, or the target platform does not support HWRT, many authors propose tracing against a distance field representation of the scene instead [Hu et al 2021]. While this is much faster, artefacts and inaccuracies are introduced as we now no longer trace against the true scene surface.…”

Section: Introduction and Related Workmentioning

confidence: 99%

Combining GPU Tracing Methods within a Single Ray Query

Pieterjan¹,

Harada

2022

SIGGRAPH Asia 2022 Technical Communications

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HWRT onlyCombined (Ours) DF Only GI-1.0 Time: 5.66 ms 4.55 ms 3.58 ms Figure 1: Our combined tracing method applied within GI-1.0 [Boissé et al. 2022], shown with the per-frame time of the GI algorithm.Notice that with our method, we do not have the obvious artefacts in corners and in shadows. These artefacts are due to inaccuracies in the distance field, which we avoid, while saving 1.2 ms compared to the hardware ray tracing only solution. While not visually identical, our result is much closer and more perceptually pleasing without paying the full cost of hardware ray tracing. Full resolution images can be found in our supplemental material.

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Rendering piecewise approximations of SDFs through analytic intersections

Pujol,

Chica

2024

Computers & Graphics

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Efficient real-time dynamic diffuse global illumination using signed distance fields

Cited by 6 publications

References 14 publications

A Theoretical Analysis of Compactness of the Light Transport Operator

A Theoretical Analysis of Compactness of the Light Transport Operator

Combining GPU Tracing Methods within a Single Ray Query

Rendering piecewise approximations of SDFs through analytic intersections

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