A programmable system for artistic volumetric lighting

NowrouzezahraiDerek,; JohnsonJared,; SelleAndrew,; LacewellDylan,; KaschalkMichael,; Jarosz, Wojciech

doi:10.1145/2010324.1964924

Cited by 27 publications

(23 citation statements)

References 31 publications

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“…However, the proposed formulation could be adapted by ensuring that the editing function M x j ,x e is continuous and calculable for any point p e between p e and x e . Following an approach similar to light beams manipulation [13] could be envisioned to do such extension.…”

Section: Discussionmentioning

confidence: 99%

RayPortals: a light transport editing framework

et al. 2015

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Physically based rendering, using path-space formulation of global illumination, has become a standard technique for high-quality computer generated imagery. Nonetheless, being able to control and edit the resulting picture so that it corresponds to the artist vision is still a tedious trialand-error process. We show how the manipulation of light transport translates into the path-space integral formulation of the rendering equation. We introduce portals as a pathspace manipulation tool to edit and control renderings and show how our editing tool unifies and extends previous work on lighting editing. Portals allow the artist to precisely control the final aspect of the image without modifying neither scene geometry nor lighting setup. According to the setup of two geometric handles and a simple path selection filter, portals capture specific lightpaths and teleport them through 3D space. We implement portals in major path based algorithms (Photon Mapping, Progressive Photon Mapping and Bi-directional Path Tracing) and demonstrate the wide range of control this technique allows on various lighting effects, from low frequency color bleeding to high frequency caustics as well as view-dependent reflections.

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Section: Discussionmentioning

confidence: 99%

RayPortals: a light transport editing framework

et al. 2015

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“…Nowrouzezahrai et al . [NJS∗ 11] break down and edit the emissive properties of participating media. Our method also alters light propagation to isolate and render global shadows, but user control is deferred to post‐processing.…”

Section: Related Workmentioning

confidence: 99%

Global Illumination Shadow Layers

Desrichard

Vanderhaeghe

Paulin

2019

Computer Graphics Forum

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Computer graphics artists often resort to compositing to rework light effects in a synthetic image without requiring a new render. Shadows are primary subjects of artistic manipulation as they carry important stylistic information while our perception is tolerant with their editing. In this paper we formalize the notion of global shadow, generalizing direct shadow found in previous work to a global illumination context. We define an object's shadow layer as the difference between two altered renders of the scene. A shadow layer contains the radiance lost on the camera film because of a given object. We translate this definition in the theoretical framework of Monte‐Carlo integration, obtaining a concise expression of the shadow layer. Building on it, we propose a path tracing algorithm that renders both the original image and any number of shadow layers in a single pass: the user may choose to separate shadows on a per‐object and per‐light basis, enabling intuitive and decoupled edits.

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“…31,32 In computer graphics, striving for realism stimulated the development of illumination algorithms. [33][34][35][36] Studies in this field visualized light rays 37,38 avoiding clutter, 39 and showed various light properties. 30,40,41 Although the listed studies demonstrate a variety of light visualization methods, they are mostly targeted at the computer graphics audience and often take advantage of rendering methods.…”

Section: From Surfaces To Volumesmentioning

confidence: 99%

A toolbox for volumetric visualization of light properties

Kartashova

Ridder

Pas

et al. 2019

Lighting Research & Technology

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In this paper, we introduce a toolbox for the perceptually based visualization of light in a volume, focusing on the visual effects of illumination. First, our visualizations extend the conventional methods from a two-dimensional representation on surfaces to the whole volume of a scene. Second, we extend the conventional methods from showing only light intensity to visualizing three light properties (mean illuminance, primary direction and diffuseness). To make our methods generally available and easily accessible, we provide a web-based tool, to which everybody can upload data, measured by a cubic or simple illuminance meter or even a smartphone-app, and generate a variety of three-dimensional visualizations of the light field. The importance of considering the light field in its full complexity (and thus as a three-dimensional vector field instead of its two-dimensional sections) is widely acknowledged. Our toolbox allows easy access to sophisticated methods for analysing the spatial distribution of light and its primary qualities as well as how they vary throughout space. It is our hope that our results raise interest in ‘third stage’ approaches to lighting research and design, and the toolbox offers a practical solution to this complex problem.

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A programmable system for artistic volumetric lighting

Cited by 27 publications

References 31 publications

RayPortals: a light transport editing framework

RayPortals: a light transport editing framework

Global Illumination Shadow Layers

A toolbox for volumetric visualization of light properties

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