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TZID:Australia/Brisbane
X-LIC-LOCATION:Australia/Brisbane
BEGIN:STANDARD
DTSTART:19920301T030000
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
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BEGIN:VEVENT
DTSTAMP:20191203T080509Z
LOCATION:Plaza Meeting Room P1
DTSTART;TZID=Australia/Brisbane:20191120T114200
DTEND;TZID=Australia/Brisbane:20191120T120300
UID:siggraphasia_SIGGRAPH Asia 2019_sess118_papers_158@linklings.com
SUMMARY:Non-linear sphere tracing for rendering deformed signed distance f
ields
DESCRIPTION:Technical Papers\n\nNon-linear sphere tracing for rendering de
formed signed distance fields\n\nSeyb, Jacobson, Nowrouzezahrai, Jarosz\n\
nSigned distance fields (SDFs) are a particularly powerful implicit repres
entation for modeling solids, volumes and surfaces. Their infinite resolut
ion, controllable continuity, and robust constructive solid geometry opera
tions, coupled with smooth blending, have enabled powerful and intuitive s
culpting tools for creating complex SDF models. Their metric properties al
so allow efficient surface rendering via sphere tracing. Unfortunately, SD
Fs remain incompatible with many popular direct deformation techniques whi
ch re-position a surface via its explicit representation. Linear blend ski
nning used in character articulation, for example, directly displaces each
vertex of a triangle mesh. To overcome this limitation, we propose a vari
ant of sphere tracing for directly rendering deformed SDFs. We show that t
his problem reduces to integration of a non-linear ordinary differential e
quation (ODE). We propose an efficient approach with controllable error wh
ich first automatically computes an initial value along each cast ray and
then walks conservatively along the curved ray in the undeformed space acc
ording to the signed distance. Importantly, our approach does not require
knowing, computing, or even the global existence of the inverse deformatio
n, which allows us to plug in many existing forward deformations with rela
tive ease. We demonstrate the effectiveness of this approach for interacti
ve rendering of a variety of popular deformation techniques that were so f
ar limited to explicit surfaces.\n\nRegistration Category: Platinum Pass,
Full Conference Pass, Full Conference One-Day Pass
URL:https://sa2019.conference-program.com/presentation?id=papers_158&sess=
sess118
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