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DTSTAMP:20240214T070245Z
LOCATION:Meeting Room C4.8\, Level 4 (Convention Centre)
DTSTART;TZID=Australia/Melbourne:20231213T165800
DTEND;TZID=Australia/Melbourne:20231213T170800
UID:siggraphasia_SIGGRAPH Asia 2023_sess146_papers_857@linklings.com
SUMMARY:A Micrograin BSDF Model for the Rendering of Porous Layers
DESCRIPTION:Technical Communications, Technical Papers\n\nSimon Lucas (Uni
 versité de Bordeaux, INRIA); Mickael Ribardiere (Université de Poitiers); 
 and Romain Pacanowski and Pascal Barla (INRIA)\n\nWe introduce a new BSDF 
 model for the rendering of porous layers, as found on surfaces covered by 
 dust, rust, dirt, or sprayed paint. \nOur approach is based on a distribut
 ion of elliptical opaque micrograins, extending the Trowbridge-Reitz (GGX)
  distribution [Trowbridge1975,Walter2007] to handle pores (i.e., spaces be
 tween micrograins). \nWe use distance field statistics to derive the corre
 sponding Normal Distribution Function (NDF) and Geometric Attenuation Fact
 or (GAF), as well as a view- and light-dependent filling factor to blend b
 etween the porous and base layers.\nAll the derived terms show excellent a
 greement when compared against numerical simulations. \n\nOur approach has
  several advantages compared to previous work [Merillou2000,Wang2022,dEon2
 023]. \nFirst, it decouples structural and reflectance parameters, leading
  to an analytical single-scattering formula regardless of the choice of mi
 crograin reflectance. \nSecond, we show that the classical texture maps (a
 lbedo, roughness, etc) used for spatially-varying material parameters are 
 easily retargeted to work with our model. \nFinally, the BRDF parameters o
 f our model behave linearly, granting direct multi-scale rendering using c
 lassical mip mapping.\n\nRegistration Category: Full Access\n\nSession Cha
 ir: Hongzhi Wu (Zhejiang University; State Key Lab of CAD and CG, Zhejiang
  University)
URL:https://asia.siggraph.org/2023/full-program?id=papers_857&sess=sess146
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