Article
Computer Science, Software Engineering
Fujia Su, Sheng Li, Guoping Wang
Summary: This paper introduces a new method SPCBPT for accelerating bidirectional path tracing by constructing a light selection distribution. The method divides the sub-paths into multiple subspaces and uses a subspace-based two-stage sampling method to select the light sub-paths, achieving efficient light selection. Additionally, the method considers the Multiple Importance Sampling (MIS) term to optimize the upper bound of the combined estimator's variance.
ACM TRANSACTIONS ON GRAPHICS
(2022)
Article
Optics
David Blinder, Maksymilian Chlipala, Tomasz Kozacki, Peter Schelkens
Summary: Computer-generated holography algorithms come in various forms, each with different trade-offs in visual quality and calculation speed. None of these algorithms can accurately capture all 3D visual cues simultaneously. A novel algorithm combining point-based CGH precision with ray-tracing accurate shading has been proposed.
Article
Computer Science, Software Engineering
Fuyan Liu, Junwen Gan
Summary: In this paper, a novel approach for sampling indirect illumination using bidirectional path tracing and world space resampling reservoir is proposed. Light subpaths with high contribution are cached in a world space grid, allowing for sampling at any vertices along the eye path. Optimal samples are found by continuously updating the reservoirs stored in each cell based on resampling principles. Experimental results show that the algorithm achieves noticeable noise reduction in scenes lit by indirect light compared to path tracing, while maintaining interactive frame rates, albeit with additional time and memory consumption. In some special cases, the method even outperforms a plain bidirectional path tracer in terms of both image quality and performance.
COMPUTERS & GRAPHICS-UK
(2023)
Article
Computer Science, Artificial Intelligence
S. Sivasankari, G. Vadivu
Summary: The study implemented a novel method to learn discriminative features from tweets and Facebook posts, constructing a social network graph for identifying fake news propagation. By removing neighbors connected to fake news sources, the propagation of fake news was effectively reduced.
Article
Computer Science, Interdisciplinary Applications
Changgeng Li, Xia Huang, Jun Ding, Kun Song, Shiqing Lu
Summary: This paper proposes an improved A* algorithm to address the issues of long calculation time, large turning angles, and unsmoothed path in traditional A* algorithm. By introducing bidirectional alternating search, exponential attenuation weighted heuristic function, path node filtering function, and the use of Bezier curves, the algorithm achieves improved search efficiency and smoothness in robot path planning.
COMPUTERS & INDUSTRIAL ENGINEERING
(2022)
Article
Environmental Sciences
Ying Liu, Caihui Yan, Junlian Gao, Xiaofang Wu, Bo Zhang
Summary: This study examines the consumption-based perspectives and their temporal changes from 2000 to 2014, finding that the Agriculture and Construction sectors were the major contributors to global CH4 emission increases. Along global supply chains, Agriculture and Mining accounted for the majority of CH4 trade at the final consumption stage, while Food and Heavy manufacturing were significant contributors to embodied CH4 emissions in the trade of intermediate goods or services. Furthermore, China surpassed the United States as the largest importer of embodied CH4 emissions in 2014, and India surpassed China as the largest direct emitter for producing final goods or services.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Optics
Haoqiang Wang, Yi Luo, Hongtao Li, Zihan Zang, Yunpeng Xu, Yanjun Han, Changzheng Sun, Zhibiao Hao, Lai Wang, Bing Xiong, Jian Wang, Lin Gan
Summary: In this paper, an extended ray-mapping method is proposed that incorporates differentiable ray-tracing into the design pipeline, allowing for accurate surface construction and efficient shape correction. The method involves two optimization stages and has successfully designed non-paraxial and off-axis illumination lenses in a short time. Simulation results demonstrate the effectiveness and robustness of the approach.
Article
Engineering, Petroleum
Tsubasa Onishi, Hongquan Chen, Jiang Xie, Shusei Tanaka, Dongjae Kam, Zhiming Wang, Xian-huan Wen, Akhil Datta-Gupta
Summary: This study presents a robust streamline tracing algorithm for dual-porosity and dual-permeability (DPDK) models and applies it to rate allocation optimization in a waterflood reservoir. The proposed method accurately describes interactions between matrix and fracture, reduces numerical artifacts, and offers better representation of reservoir heterogeneity and well connectivity. The results show significant improvements in recovery factor, net present value (NPV), and sweep efficiency compared to the base scenario using equal rate injection and production. The proposed algorithm is computationally efficient and has potential applications in flow diagnostics and rate allocation optimization for field-scale reservoir models.
Article
Computer Science, Software Engineering
Daniel Jonsson, Joel Kronander, Jonas Unger, Thomas B. Schon, Magnus Wrenninge
Summary: Evaluating the transmittance in heterogeneous participating media is crucial for solving light transport problems. We introduce a new class of unbiased estimators that outperform traditional algorithms in performance.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2022)
Article
Geochemistry & Geophysics
Qiang Liu, Zhen-Chun Li, Jian-En Xiao, Xue-Cheng Xu
Summary: The article discusses the importance of prestack depth migration and current methods based on ray tracing and wave equations. It proposes an anisotropic reverse time migration using Gaussian beams to account for the influence of anisotropy on seismic migration. By considering the impact of anisotropy on the propagation direction and optimizing correlation coefficients in dynamic ray tracing, the method simplifies calculations and improves applicability.
GEOPHYSICAL PROSPECTING
(2022)
Article
Engineering, Mechanical
Maurizio Lazzaro
Summary: This paper presents a numerical comparison between DBI and focused shadowgraph imaging techniques for characterizing a multi-hole GDI spray, finding that diffuse backlighting can significantly bias measurements of optical thickness and spray parameters.
EXPERIMENTS IN FLUIDS
(2021)
Article
Computer Science, Software Engineering
Jose A. Iglesias-Guitian, Prajita Mane, Bochang Moon
Summary: This study proposes an image-based denoising method for denoising volumetric path tracing (VPT) images. Unlike existing denoisers for surface models, this method does not rely on noise-free auxiliary geometry buffers and preserves high-frequency details by exploiting temporal coherence between frames.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2022)
Article
Engineering, Electrical & Electronic
Jiachi Zhang, Liu Liu, Zhenhui Tan, Kai Wang, Tao Zhou
Summary: This paper proposes a 3-dimensional channel model based on ray-tracing for beamforming in millimeter-wave communication. The distribution of angles between reflection rays and the line-of-sight path is studied through channel simulation with omnidirectional antennas. The results show that the gamma distribution is a better fit for the quasiarrival angular distribution. Additionally, a Gaussian mixture model and expectation-maximization algorithm are used to characterize the relationship between departure and arrival angles.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Fabrizio Martelli, Federico Tommasi, Angelo Sassaroli, Lorenzo Fini, Stefano Cavalieri
Summary: This work presents a method for verifying the accuracy of Monte Carlo codes by using the law of average path length invariance. The method can assess the effectiveness of the code in complex media and detect inaccuracies in boundary treatment. It is applicable to various scattering and geometrical properties of the medium, providing a fundamental tool for code verification in specific geometries.
SCIENTIFIC REPORTS
(2021)
Article
Computer Science, Software Engineering
S. V. Ershov, E. D. Birukov, A. G. Voloboy, V. A. Galaktionov
Summary: The paper explores the issue of noise in ray tracing, proposes a calculation method, and demonstrates that it is possible to predict the noise variance for different numbers of rays, thereby finding the optimal parameter set to minimize noise.
PROGRAMMING AND COMPUTER SOFTWARE
(2021)
Article
Computer Science, Software Engineering
Adrien Gruson, Mickael Ribardiere, Martin Sik, Jiri Vorba, Remi Cozot, Kadi Bouatouch, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2017)
Article
Computer Science, Software Engineering
Pascal Grittmann, Arsene Perard-Gayot, Philipp Slusallek, Jaroslav Krivanek
COMPUTER GRAPHICS FORUM
(2018)
Article
Computer Science, Software Engineering
Petr Vevoda, Ivo Kondapaneni, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2018)
Article
Computer Science, Software Engineering
Sebastian Herholz, Yangyang Zhao, Oskar Elek, Derek Nowrouzezahrai, Hendrik P. A. Lensch, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2019)
Article
Computer Science, Software Engineering
Ivo Kondapaneni, Petr Vevoda, Pascal Grittmann, Tomas Skrivan, Philipp Slusallek, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2019)
Article
Computer Science, Software Engineering
Denis Sumin, Tobias Rittig, Vahid Babaei, Thomas Nindel, Alexander Wilkie, Piotr Didyk, Bernd Bickel, Jaroslav Krivanek, Karol Myszkowski, Tim Weyrich
ACM TRANSACTIONS ON GRAPHICS
(2019)
Article
Physics, Applied
Bart van Dam, Benjamin Bruhn, Ivo Kondapaneni, Gejza Dohnal, Alexander Wilkie, Jaroslav Krivanek, Jan Valenta, Yvo D. Mudde, Peter Schall, Katerina Dohnalova
PHYSICAL REVIEW APPLIED
(2019)
Article
Computer Science, Software Engineering
Ondrej Karlik, Martin Sik, Petr Vevoda, Tomas Skrivan, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2019)
Article
Computer Science, Software Engineering
Martin Sik, Jaroslav Krivanek
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2020)
Article
Computer Science, Software Engineering
Alexander Rath, Pascal Grittmann, Sebastian Herholz, Petr Vevoda, Philipp Slusallek, Jaroslav Krivanek
ACM TRANSACTIONS ON GRAPHICS
(2020)
Article
Computer Science, Software Engineering
Alexander Wilkie, Petr Vevoda, Thomas Bashford-Rogers, Lukas Hosek, Tomas Iser, Monika Kolarova, Tobias Rittig, Jaroslav Krivanek
Summary: The model significantly enhances visual realism compared to existing clear sky models by using scatterer distribution data from atmospheric measurements. It also introduces new features not found in fitted models, such as radiance patterns for post-sunset conditions.
ACM TRANSACTIONS ON GRAPHICS
(2021)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Asen Atanasov, Vladimir Koylazov, Blagovest Taskov, Alexander Soklev, Vassillen Chizhov, Jaroslav Krivanek
SIGGRAPH'18: ACM SIGGRAPH 2018 TALKS
(2018)