Practical physically-based shading in film and game production

McAuley, Stephen; Hill, Stephen; Hoffman, Naty; Gotanda, Yoshiharu; Smits, Brian; Burley, Brent; Martinez, Adam

doi:10.1145/2343483.2343493

Cited by 99 publications

(73 citation statements)

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“…NVIDIA's MentalRay, Radiance [1998], PBRT [2010], Arnold by Solid Angle Inc.). The availability of efficient PBR systems with progressive pre-visualization has promoted rapid adoption of PBR standards in the feature-film and gaming industries [McAuley et al 2012;Křivánek et al 2010]. As such, artists are becoming increasingly familiar with technical PBR concepts.…”

Section: Introductionmentioning

confidence: 99%

Path-space manipulation of physically-based light transport

et al. 2013

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manipulated manipulated original originalFigure 1: Transport manipulation in the GARAGE scene. Before/after close-ups (right): removing indirect highlights caused by the car, re-directing sunlight after it refracts through the windows, moving and rotating a glossy interreflection, and altering the mirror reflection. AbstractIndustry-quality content creation relies on tools for lighting artists to quickly prototype, iterate, and refine final renders. As industryleading studios quickly adopt physically-based rendering (PBR) across their art generation pipelines, many existing tools have become unsuitable as they address only simple effects without considering underlying PBR concepts and constraints. We present a novel light transport manipulation technique that operates directly on path-space solutions of the rendering equation. We expose intuitive direct and indirect manipulation approaches to edit complex effects such as (multi-refracted) caustics, diffuse and glossy indirect bounces, and direct / indirect shadows. With our sketch-and objectspace selection, all built atop a parameterized regular expression engine, artists can search and isolate shading effects to inspect and edit. We classify and filter paths on the fly and visualize the selected transport phenomena. We survey artists who used our tool to manipulate complex phenomena on both static and animated scenes.

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Section: Introductionmentioning

confidence: 99%

Path-space manipulation of physically-based light transport

et al. 2013

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“…An in depth analysis of BRDFs in half-difference parameterization was given by Burley et al in Refs. [5] and [6], who introduced a characteristic slice, i.e., a θ h × θ d subset of BRDF space, and showed its convenience for analysis of physically related properties of the BRDFs in the MERL database. A parameterized non-linear sampling along θ h in the characteristic slice was applied in Ref.…”

Section: Brdf Parameterizationsmentioning

confidence: 99%

“…This holds globally due to the random distribution of flakes and disregards the effects of mutual viewing and light rotations around the half-vector. Then we can extend the concept of bivariate BRDF [4] to bivariate SVBRDF and capture only images belonging to the characteristic slice depending on θ h and θ d [5] for fixed ϕ d = 90 • , which conveys most of the information. This restricts the number of images to n θ h × n θ d = 18 × 18 = 324; again due to the technical restriction on maximum elevation, only 243 images are captured.…”

Section: Bivariate Isotropic Representation: Constantmentioning

confidence: 99%

Image-based appearance acquisition of effect coatings

Filip

Vávra

2019

Comp. Visual Media

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Paint manufacturers strive to introduce unique visual effects to coatings in order to visually communicate functional properties of products using value-added, customized design. However, these effects often feature complex, angularly dependent, spatiallyvarying behavior, thus representing a challenge in digital reproduction. In this paper we analyze several approaches to capturing spatially-varying appearances of effect coatings. We compare a baseline approach based on a bidirectional texture function (BTF) with four variants of half-difference parameterization. Through a psychophysical study, we determine minimal sampling along individual dimensions of this parameterization. We conclude that, compared to BTF, bivariate representations better preserve visual fidelity of effect coatings, better characterizing near-specular behavior and significantly the restricting number of images which must be captured.

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“…Physically-based shaders simulates materials and light based on measured physical parameters [11]. Coupled with faster hardware, the images render within a few milliseconds [7].…”

Section: A Proceduresmentioning

confidence: 99%

Detecting topographical eye disorders

Patel¹,

Gouia‐Zarrad

2017

BIOMATH

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Abstract-The goal of this paper is to outline a novel method of detecting topographical eye diseases using a mobile phone. Because the shape of the eye is of concern, its exterior will be evaluated. The description and current implementation of the technique will be discussed, where the keratoconus disease is used as an example. The technique uses pictures taken of the eye using the onboard camera, and each one is compared to idealized images rendered in the phone. The pictures taken will be compared to the idealized images to search for the presence of the disease.

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Practical physically-based shading in film and game production

Cited by 99 publications

References 0 publications

Path-space manipulation of physically-based light transport

Path-space manipulation of physically-based light transport

Image-based appearance acquisition of effect coatings

Detecting topographical eye disorders

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