Fast light-map computation with virtual polygon lights

Luksch, Christian; Tobler, Robert F.; Habel, Ralf; Schwärzler, Michael; Wimmer, Michael

doi:10.1145/2448196.2448210

Cited by 21 publications

(21 citation statements)

References 29 publications

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“…Other approaches focus on interactivity, and try to decrease the feedback cycles between modeling and simulation. Both Luksch et al [21] and Krösl et al [18] rely on fast, GPU-based simulations. Despite being efficient, they do not offer guided modeling proposals or methods to explore and compare parallel modeling tracks.…”

Section: Lighting Designmentioning

confidence: 99%

“…3.2). In our approach, the light transport simulation is performed using a GPU-based many-light approach similar to Luksch et al [21], and the incoming light is stored in the texels of a light map that covers all surface geometry. A measuring surface on the desktop, and glare probes (simulating a person's field of view while working on this desk) are used to gather illumination information, such as the average illuminance and the uniformity on an area, or if a person is likely to be blinded.…”

Section: Generating Illumination Datamentioning

confidence: 99%

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LightGuider: Guiding Interactive Lighting Design using Suggestions, Provenance, and Quality Visualization

Walch

Schwärzler

Luksch

et al. 2019

IEEE Trans. Visual. Comput. Graphics

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Fig. 1. The components of LightGuider : (a) a 3D modeling view to place and modify luminaires, augmented with (b) a provenance tree, depicting several sequential modeling steps and parallel modeling branches, integrating information on the quality of the individual solutions, and providing guidance by pre-simulating and suggesting possible next steps to improve the design. A film-strip-like visualization (c) of screenshots helps to depict the evolution up to the currently selected state. A quality view (d) informs about the fulfillment level of the illumination constraints that need to be met, using bullet charts. Changing the weights of these constraints (e), and therefore, the lighting designer's focus, triggers an update of the provenance tree node visualizations (reflecting the weights of the constraints in the distribution of the treemap space). Moreover, the defined weights are also considered in the generation of new suggestions, which are tailored towards satisfying constraints with higher weights.Abstract-LightGuider is a novel guidance-based approach to interactive lighting design, which typically consists of interleaved 3D modeling operations and light transport simulations. Rather than having designers use a trial-and-error approach to match their illumination constraints and aesthetic goals, LightGuider supports the process by simulating potential next modeling steps that can deliver the most significant improvements. LightGuider takes predefined quality criteria and the current focus of the designer into account to visualize suggestions for lighting-design improvements via a specialized provenance tree. This provenance tree integrates snapshot visualizations of how well a design meets the given quality criteria weighted by the designer's preferences. This integration facilitates the analysis of quality improvements over the course of a modeling workflow as well as the comparison of alternative design solutions. We evaluate our approach with three lighting designers to illustrate its usefulness.

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Section: Lighting Designmentioning

confidence: 99%

Section: Generating Illumination Datamentioning

confidence: 99%

LightGuider: Guiding Interactive Lighting Design using Suggestions, Provenance, and Quality Visualization

Walch

Schwärzler

Luksch

et al. 2019

IEEE Trans. Visual. Comput. Graphics

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“…Using an interior design software allows us to model rooms with realistically looking furnishings. After importing these 3D scenes into HILITE, we are able to insert luminaires and render the scenes with physically plausible lighting, using a realistic material model [18] and the many-light global-illumination solution of Luksch et al [17].…”

Section: Realistic Environmentsmentioning

confidence: 99%

A VR-based user study on the effects of vision impairments on recognition distances of escape-route signs in buildings

et al. 2018

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In workplaces or publicly accessible buildings, escape routes are signposted according to official norms or international standards that specify distances, angles and areas of interest for the positioning of escape-route signs. In homes for the elderly, in which the residents commonly have degraded mobility and suffer from vision impairments caused by age or eye diseases, the specifications of current norms and standards may be insufficient. Quantifying the effect of symptoms of vision impairments like reduced visual acuity on recognition distances is challenging, as it is cumbersome to find a large number of user study participants who suffer from exactly the same form of vision impairments. Hence, we propose a new methodology for such user studies: By conducting a user study in virtual reality (VR), we are able to use participants with normal or corrected sight and simulate vision impairments graphically. The use of standardized medical eyesight tests in VR allows us to calibrate the visual acuity of all our participants to the same level, taking their respective visual acuity into account. Since we primarily focus on homes for the elderly, we accounted for their often limited mobility by implementing a wheelchair simulation for our VR application.

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“…In the field of comparative visualization, LiteVis [SOL*16] provides features to compare surface changes for interactive lighting design. In contrast to our approach, their technique builds upon virtual point lights [LTH*13] for fast feedback, which is a biased technique, and is restricted to surface measurements, whereas our technique allows arbitrary scene changes and can be used to optimize scene arrangements and rendering. While inverse rendering [PP03] might be able to solve some of these problems, more fine‐grained information visualization and manual inspection is often required.…”

Section: Related Workmentioning

confidence: 99%

Applying Visual Analytics to Physically Based Rendering

Simons¹,

Herholz

Petitjean

et al. 2018

Computer Graphics Forum

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Physically based rendering is a well‐understood technique to produce realistic‐looking images. However, different algorithms exist for efficiency reasons, which work well in certain cases but fail or produce rendering artefacts in others. Few tools allow a user to gain insight into the algorithmic processes. In this work, we present such a tool, which combines techniques from information visualization and visual analytics with physically based rendering. It consists of an interactive parallel coordinates plot, with a built‐in sampling‐based data reduction technique to visualize the attributes associated with each light sample. Two‐dimensional (2D) and three‐dimensional (3D) heat maps depict any desired property of the rendering process. An interactively rendered 3D view of the scene displays animated light paths based on the user's selection to gain further insight into the rendering process. The provided interactivity enables the user to guide the rendering process for more efficiency. To show its usefulness, we present several applications based on our tool. This includes differential light transport visualization to optimize light setup in a scene, finding the causes of and resolving rendering artefacts, such as fireflies, as well as a path length contribution histogram to evaluate the efficiency of different Monte Carlo estimators.

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Fast light-map computation with virtual polygon lights

Cited by 21 publications

References 29 publications

LightGuider: Guiding Interactive Lighting Design using Suggestions, Provenance, and Quality Visualization

LightGuider: Guiding Interactive Lighting Design using Suggestions, Provenance, and Quality Visualization

A VR-based user study on the effects of vision impairments on recognition distances of escape-route signs in buildings

Applying Visual Analytics to Physically Based Rendering

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