iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Obert, Juraj; Křivánek, Jaroslav; Pellacini, Fabio; Sýkora, Daniel; Pattanaik, Sumanta

doi:10.1111/j.1467-8659.2008.01260.x

Cited by 20 publications

(24 citation statements)

References 20 publications

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“…Nowrouzezahrai et al [2011] designed a tool for artistic manipulation of volumetric lighting which, like ours, is integrated into existing industrial pipelines; this facilitated and promoted its adoption in the industry. Obert et al [2008] use a painting interface to edit the intensity and color of indirect light, all while enforcing physical constraints on the resulting appearance. Tabellion and Lamorlette [2004] use shader falloff-function editing on the hue of indirect color bleeding effects.…”

Section: Previous Workmentioning

confidence: 99%

“…We begin by detailing our path retargeting (explicitly altering path segments), and then describe path-proxy linking, which enables manipulation by linking transformed scene objects to appropriate light transport phenomena. Both of these strategies additionally support brightness scaling/offsetting and hue editing (in the spirit of [Obert et al 2008]). In Sec.…”

Section: Manipulation Of Light Transportmentioning

confidence: 99%

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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: Previous Workmentioning

confidence: 99%

Section: Manipulation Of Light Transportmentioning

confidence: 99%

Path-space manipulation of physically-based light transport

et al. 2013

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“…Most of them use sketching or painting interfaces that allow users to directly draw lighting effects [Schoeneman et al 1993;Poulin et al 1997;Pellacini et al 2007;Todo et al 2007;Obert et al 2008]. While these methods are effective in controlling (global) illumination and low-frequency BRDFs, the view-dependent, high-frequency complexity of reflections and refractions is better addressed by our approach, which deforms the existing reflections and refractions.…”

Section: Previous Workmentioning

confidence: 99%

Interactive reflection editing

Ritschel¹,

Okabe²,

Thormählen³

et al. 2009

ACM SIGGRAPH Asia 2009 Papers

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Effective digital content creation tools must be both efficient in the interactions they provide but also allow full user control. There may be occasions, when art direction requires changes that contradict physical laws. In particular, it is known that physical correctness of reflections for the human observer is hard to assess. For many centuries, traditional artists have exploited this fact to depict reflections that lie outside the realm of physical possibility. However, a system that gives explicit control of this effect to digital artists has not yet been described. This paper introduces a system that transforms physically correct reflections into art-directed reflections, as specified by reflection constraints. The system introduces a taxonomy of reflection editing operations, using an intuitive user interface, that works directly on the reflecting surfaces with real-time visual feedback using a GPU. A user study shows how such a system can allow users to quickly manipulate reflections according to an art direction task.

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“…Unfortunately, these modifications are often complicated because physically-based parameters can be non-intuitive and the physical models complex. More intuitive manipulation means have been investigated for light-source editing [20] or modifications to the light transport of spot lights [10], indirect light [9], and shadows [21].…”

Section: Related Workmentioning

confidence: 99%

“…For this reason, artists often start with a realistic simulation before modifying the appearance, e.g., [9], [10], [11]. Unfortunately, changing the appearance of volumes is difficult.…”

Section: Introductionmentioning

confidence: 99%

Property and Lighting Manipulations for Static Volume Stylization Using a Painting Metaphor

Klehm

Ihrke

Seidel

et al. 2014

IEEE Trans. Visual. Comput. Graphics

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Although volumetric phenomena are important for realistic rendering and can even be a crucial component in the image, the artistic control of the volume's appearance is challenging. Appropriate tools to edit volume properties are missing, which can make it necessary to use simulation results directly. Alternatively, high-level modifications that are rarely intuitive, e.g., the tweaking of noise function parameters, can be utilized. Our work introduces a solution to stylize single-scattering volumetric effects in static volumes. Hereby, an artistic and intuitive control of emission, scattering and extinction becomes possible, while ensuring a smooth and coherent appearance when changing the viewpoint. Our method is based on tomographic reconstruction, which we link to the volumetric rendering equation. It analyzes a number of target views provided by the artist and adapts the volume properties to match the appearance for the given perspectives. Additionally, we describe how we can optimize for the environmental lighting to match a desired scene appearance, while keeping volume properties constant. Finally, both techniques can be combined. We demonstrate several use cases of our approach and illustrate its effectiveness.

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iCheat: A Representation for Artistic Control of Indirect Cinematic Lighting

Cited by 20 publications

References 20 publications

Path-space manipulation of physically-based light transport

Path-space manipulation of physically-based light transport

Interactive reflection editing

Property and Lighting Manipulations for Static Volume Stylization Using a Painting Metaphor

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