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TZID:Asia/Tokyo
X-LIC-LOCATION:Asia/Tokyo
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TZOFFSETFROM:0900
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DTSTART:18871231T000000
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BEGIN:VEVENT
DTSTAMP:20181210T184840Z
LOCATION:Hall D5 (5F\, D Block)
DTSTART;TZID=Asia/Tokyo:20181205T102400
DTEND;TZID=Asia/Tokyo:20181205T104500
UID:siggraphasia_SIGGRAPH Asia 2018_sess120_papers_283@linklings.com
SUMMARY:Position-Free Monte Carlo Simulation for Arbitrary Layered BSDFs
DESCRIPTION:Technical Papers\nFull Conference Pass (FC), Full Conference O
ne-Day Pass (1D)\n\nPosition-Free Monte Carlo Simulation for Arbitrary Lay
ered BSDFs\n\nGuo, Hasan, Zhao\n\nReal-world materials are often layered:
metallic paints, biological tissues, and many more. Variation in the inter
face and volumetric scattering properties of the layers leads to a rich di
versity of material appearances from anisotropic highlights to complex tex
tures and relief patterns. However, simulating light-layer interactions is
a challenging problem. Past analytical or numerical solutions either intr
oduce several approximations and limitations, or rely on expensive operati
ons on discretized BSDFs, preventing the ability to freely vary the layer
properties spatially. We introduce a new unbiased layered BSDF model based
on Monte Carlo simulation, whose only limitation is the layer assumption
itself. Our novel position-free path formulation is fundamentally more pow
erful at constructing light transport paths than generic light transport a
lgorithms applied to the special case of flat layers, since it is based on
a product of solid angle instead of area measures, so does not contain th
e high-variance geometry terms needed in the standard formulation. We intr
oduce two techniques for sampling the position-free path integral, a forwa
rd path tracer with next-event estimation and a full bidirectional estimat
or. We show a number of examples, featuring multiple layers with surface a
nd volumetric scattering, surface and phase function anisotropy, and spati
al variation in all parameters.
URL:https://sa2018.conference-program.com/presentation?id=papers_283&sess=
sess120
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