Hierarchical Image-Space Radiosity for Interactive Global Illumination

We introduce image‐space radiosity and a hierarchical variant as a method for interactively approximating diffuse indirect illumination in fully dynamic scenes. As oft observed, diffuse indirect illumination contains mainly low‐frequency details that do not require independent computations at every...

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Vydané v:Computer graphics forum Ročník 28; číslo 4; s. 1141 - 1149
Hlavní autori: Nichols, Greg, Shopf, Jeremy, Wyman, Chris
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Oxford, UK Blackwell Publishing Ltd 01.06.2009
Predmet:
Algorithms
Computer graphics
Computer science
Diffusion
I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism
Light
ISSN:0167-7055, 1467-8659
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Shrnutí:We introduce image‐space radiosity and a hierarchical variant as a method for interactively approximating diffuse indirect illumination in fully dynamic scenes. As oft observed, diffuse indirect illumination contains mainly low‐frequency details that do not require independent computations at every pixel. Prior work leverages this to reduce computation costs by clustering and caching samples in world or object space. This often involves scene preprocessing, complex data structures for caching, or wasted computations outside the view frustum. We instead propose clustering computations in image space, allowing the use of cheap hardware mipmapping and implicit quadtrees to allow coarser illumination computations. We build on a recently introduced multiresolution splatting technique combined with an image‐space lightcut algorithm to intelligently choose virtual point lights for an interactive, one‐bounce instant radiosity solution. Intelligently selecting point lights from our reflective shadow map enables temporally coherent illumination similar to results using more than 4096 regularly‐sampled VPLs.
Bibliografia:ark:/67375/WNG-TBTDBVQB-4
istex:EE63F60FDCCCA8AEC7792A46695332B9F7E2BC49
ArticleID:CGF1491
E‐mail
jshopf@gmail.com
cwyman@cs.uiowa.edu
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gbnichol@cs.uiowa.edu
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0167-7055
1467-8659
DOI:10.1111/j.1467-8659.2009.01491.x