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DTSTAMP:20260114T163633Z
LOCATION:Darling Harbour Theatre\, Level 2 (Convention Centre)
DTSTART;TZID=Australia/Melbourne:20231212T093000
DTEND;TZID=Australia/Melbourne:20231212T124500
UID:siggraphasia_SIGGRAPH Asia 2023_sess209_papers_711@linklings.com
SUMMARY:Projective Sampling for Differentiable Rendering of Geometry
DESCRIPTION:Ziyi Zhang, Nicolas Roussel, and Wenzel Jakob (Ecole Polytechn
 ique Fédérale de Lausanne)\n\nDiscontinuous visibility changes at object b
 oundaries remain a persistent source of difficulty in the area of differen
 tiable rendering. Left untreated, they bias computed gradients so severely
  that even basic optimization tasks fail.\n\nPrior path-space methods addr
 essed this bias by decoupling boundaries from the interior, allowing each 
 part to be handled using specialized Monte Carlo sampling strategies. Whil
 e conceptually powerful, the full potential of this idea remains unrealize
 d since existing methods often fail to adequately sample the boundary prop
 ortional to its contribution.\n\nThis paper presents theoretical and algor
 ithmic contributions. On the theoretical side, we transform the boundary d
 erivative into a remarkably simple local integral that invites present and
  future developments.\n\nBuilding on this result, we propose a new strateg
 y that projects ordinary samples produced during forward rendering onto ne
 arby boundaries. The resulting projections establish a variance-reducing g
 uiding distribution that accelerates convergence of the subsequent differe
 ntial phase.\n\nWe demonstrate the superior efficiency and versatility of 
 our method across a variety of shape representations, including triangle m
 eshes, implicitly defined surfaces, and cylindrical fibers based on Bézier
  curves.\n\nRegistration Category: Full Access, Enhanced Access, Trade Exh
 ibitor, Experience Hall Exhibitor\n\n
URL:https://asia.siggraph.org/2023/full-program?id=papers_711&sess=sess209
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