Non-linear volume photon mapping

Gutiérrez, Diego; Muñoz, Arsenio; Anson, Oscar; Serón, Francisco J.

doi:10.1145/1508044.1508109

Cited by 18 publications

(32 citation statements)

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“…Adding this term to the RTE (Eq. 3) we obtain the full radiative transfer equation (FRTE) [Gutierrez et al 2005]. Since our proposed method to reduce rendering times is independent of the algorithm used to compute light transport in participating media, there is no restriction as to what type of scattering events can be taken into account.…”

Section: Light Transport In Participating Mediamentioning

confidence: 99%

Perceptual rendering of participating media

Sundstedt

Gutiérrez

Anson

et al. 2007

ACM Trans. Appl. Percept.

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High-fidelity image synthesis is the process of computing images that are perceptually indistinguishable from the real world they are attempting to portray. Such a level of fidelity requires that the physical processes of materials and the behavior of light are accurately simulated. Most computer graphics algorithms assume that light passes freely between surfaces within an environment. However, in many applications, we also need to take into account how the light interacts with media, such as dust, smoke, fog, etc., between the surfaces. The computational requirements for calculating the interaction of light with such participating media are substantial. This process can take many hours and rendering effort is often spent on computing parts of the scene that may not be perceived by the viewer. In this paper, we present a novel perceptual strategy for physically based rendering of participating media. By using a combination of a saliency map with our new extinction map (X map), we can significantly reduce rendering times for inhomogeneous media. The visual quality of the resulting images is validated using two objective difference metrics and a subjective psychophysical experiment. Although the average pixel errors of these metric are all less than 1%, the subjective validation indicates that the degradation in quality still is noticeable for certain scenes. We thus introduce and validate a novel light map (L map) that accounts for salient features caused by multiple light scattering around light sources. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or direct commercial advantage and that copies show this notice on the first page or initial screen of a display along with the full citation. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, to redistribute to lists, or to use any component of this work in other works requires prior specific permission and/or a fee. Permissions may be requested from Publications Dept., ACM, Inc., 2 Penn Plaza, Suite 701, New York, NY 10121-0701 USA, fax +1 (212) 869-0481, or permissions@acm.org.

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Section: Light Transport In Participating Mediamentioning

confidence: 99%

Perceptual rendering of participating media

Sundstedt

Gutiérrez

Anson

et al. 2007

ACM Trans. Appl. Percept.

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“…This is problematic because tracking which light rays that contribute to the illumination of some point along a viewing ray is not trivial. Offline techniques, such as volumetric photon mapping presented by Gutierrez [2], aim to simulate this phenomenon directly, by shooting photons through a scene and storing illumination contributions where they land. These techniques require large amounts of photons to be simulated for the result to appear continuous, and are thus prohibitively expensive for interactive applications.…”

Section: Problem and Contributionmentioning

confidence: 99%

“…In particular, we want to avoid the explicit generation of an illumination volume as, in the context of refraction, such a discretization is problematic since the curved light rays greatly complicate sampling on a regular grid. For noninteractive applications, techniques such as volumetric photon mapping [2,32] have been employed to render scalar fields with refractive media. These techniques are, however, prohibitively expensive for interactive applications as the amount of photons needed for the result to appear continuous is too large.…”

Section: Chaptermentioning

confidence: 99%

Interactive Dynamic Volume Illumination with Refraction and Caustics

Magnus

Brückner

2018

IEEE Trans. Visual. Comput. Graphics

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1 AcknowledgmentsI would like to thank Professor Stefan Bruckner for supervising this thesis and for the great discussions we frequently had giving rise to the solutions presented in this thesis. I would also like to thank Itai Kallos for informative discussions giving insight in the physics behind our light model. In recent years, significant progress has been made in developing high-quality interactive methods for realistic volume illumination. However, refractiondespite being an important aspect of light propagation in participating media -has so far only received little attention. In this thesis, we present a novel approach for refractive volume illumination including caustics capable of interactive frame rates. By interleaving light and viewing ray propagation, our technique avoids memory-intensive storage of illumination information and does not require any precomputation. Propagation of refracted illumination is realized by employing a Semi-Lagrangian backward integration scheme, inspired by texture advection from the field of texture-based flow visualization. It is fully dynamic and all parameters such as light position and transfer function can be modified interactively without a performance penalty.

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“…Gutierrez, et al [4] proposed a single wavelength photon model, where each photon has a different single wavelength. They rendered fluorescent materials taking into account dispersion of light.…”

Section: Related Workmentioning

confidence: 99%

Performance Improvement of Physically Based Spectral Rendering Using Stochastic Sampling

Watanabe

Kanamori

Ikeda

et al. 2013

Lecture Notes in Computer Science

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Abstract. In recent years, many researchers in computer graphics pay attention to spectral rendering where light transport is modeled with multiple wavelengths instead of just using the red, green and blue components. This paper discusses some of the advantages of spectral rendering compared to traditional RGB rendering. For the practical use of spectral rendering, it is important to improve the performance of calculating the spectral distribution of light. The paper also proposes a method for efficiently sampling the wavelength of light in photon mapping-based rendering.

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Non-linear volume photon mapping

Cited by 18 publications

References 0 publications

Perceptual rendering of participating media

Perceptual rendering of participating media

Interactive Dynamic Volume Illumination with Refraction and Caustics

Performance Improvement of Physically Based Spectral Rendering Using Stochastic Sampling

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