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Journal articles on the topic 'Raytracer'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Vasiljević, Ivana, and Lidija Krstanović. "TEORIJSKE OSNOVE I IMPLEMENTACIJA RAYTRACER ALGORITMA ZA RENDEROVANjE." Zbornik radova Fakulteta tehničkih nauka u Novom Sadu 34, no. 05 (May 2, 2019): 978–81. http://dx.doi.org/10.24867/02sa01vasiljevic.

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Raytracer je algoritam globalnog osvetljenja koji se u današnje vreme koristi za kreiranje (renderovanje, eng. rendering) slika visokog stepena realističnosti. U osnovi, ideja je imitirati način realnog prostiranja svetlosti kroz prostor. Ako je prostor kroz koji se svetlost kreće homogen i izotropan, putanje svetlosti su prave linije. Dakle, problemu bi mogli pristupiti ovako: krenuvši od nekog izvora svetlosti pratili bismo kretanje jednog od zraka. Prilikom kretanja kroz prostor u jednom trenutku zrak bi došao do dioptrijskih površina i pritom se jedan njegov deo reflektuje, drugi prelama, a treći apsorbuje. U slučaju da površina nije dioptrijska jednostavno bismo zanemarili prelamanje svetlosti. Sada bi pratili novonastale zrake i ponavljali postupak za svako presecanje zraka sa površinom dok zrak ne bi došao do sočiva kamere ili oka promatrača. Samo takve zrake koje u konačnici prolaze kroz povšinu sočiva ili oka doprinose generisanju slike. Postupak bi trebalo ponoviti za svaki zrak poslat od odgovarajućeg izvora svetlosti, i isto uraditi za sve ostale izvore svetlosti (ukoliko postoje) na sceni.

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2

Winchen, Tobias. "RadioPropa — A Modular Raytracer for In-Matter Radio Propagation." EPJ Web of Conferences 216 (2019): 03002. http://dx.doi.org/10.1051/epjconf/201921603002.

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Experiments for radio detection of UHE particles such as e.g. ARA/ARIANNA or NuMoon require detailed understanding of the propagation of radio waves in the surrounding matter. The index of refraction in e.g. polar ice or lunar rock may have a complex spatial structure that makes detailed simulations of the radio propagation necessary to design the respective experiments and analyse their data. Here, we present RadioPropa as a new modular ray tracing code that solves the eikonal equation with a Runge-Kutta method in arbitrary refractivity fields. RadioPropa is based on the cosmic ray propagation code CRPropa, which has been forked to allow efficient incorporation of the required data structures for ray tracing while retaining its modular design. This allows for the setup of versatile simulation geometries as well as the easy inclusion of additional physical effects such as e.g. partial reflection on boundary layers in the simulations. We discuss the principal design of the code as well as its performance in example applications.

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3

Pontoppidan, Klaus M., Rowin Meijerink, Cornelis P. Dullemond, and Geoffrey A. Blake. "A NEW RAYTRACER FOR MODELING AU-SCALE IMAGING OF LINES FROM PROTOPLANETARY DISKS." Astrophysical Journal 704, no. 2 (October 2, 2009): 1482–94. http://dx.doi.org/10.1088/0004-637x/704/2/1482.

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4

Henke, Michael, and Gerhard H. Buck-Sorlin. "Using a Full Spectral Raytracer for Calculating Light Microclimate in Functional-Structural Plant Modelling." Computing and Informatics 36, no. 6 (2017): 1492–522. http://dx.doi.org/10.4149/cai_2017_6_1492.

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5

Finger, Larry W., Martin Kroeker, and Brian H. Toby. "DRAWxtl, an open-source computer program to produce crystal structure drawings." Journal of Applied Crystallography 40, no. 1 (January 12, 2007): 188–92. http://dx.doi.org/10.1107/s0021889806051557.

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The computer programDRAWxtlproduces crystal structure drawings in the form of an interactive screen representation, as well as VRML files for use on web pages and in classroom teaching, and creates input files for the popularPersistence of Vision Raytracer(POV-Ray) rendering program for publication-quality graphics, including generation of stereo pairs.DRAWxtloutput produces the standard kinds of graphical representations: spheres, ellipsoids, bonds and polyhedra of any complexity. In addition, it can draw arrows to represent magnetic moments, show capped cones to indicate the location of lone-pair electrons and display Fourier contours in three dimensions. A unique feature of this program is the ability to plot incommensurately modulated and composite structures. This open-source program can be used with operating systems as diverse as Windows (9X, NT, 2000 and XP), Mac OS X, Linux and most other varieties of Unix.

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6

Walder, Cordula. "Optical modeling of thin-film silicon solar cells by combination of the transfer-matrix method and the raytracer algorithm." Optical Engineering 51, no. 7 (July 6, 2012): 073801. http://dx.doi.org/10.1117/1.oe.51.7.073801.

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7

Sun, Mengyao, Jie Zhang, and Wei Zhang. "Alternating first-arrival traveltime tomography and waveform inversion for near-surface imaging." GEOPHYSICS 82, no. 4 (July 1, 2017): R245—R257. http://dx.doi.org/10.1190/geo2016-0576.1.

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Near-surface seismic imaging often plays a significant role in producing quality data processing results for the deep subsurface in land and shallow marine environments. First-arrival traveltime tomography is a common approach for near-surface imaging due to its high efficiency and simplicity. However, the method faces issues of missing hidden layers and resolving the structures with low resolution. On the other hand, waveform inversion should offer better solutions for dealing with these issues, but it may suffer from the cycle-skipping problem. We intend to use the advantages and reduce the disadvantages of the two methods by developing a new strategy of alternately applying traveltime tomography and waveform inversion through iterations. First-arrival traveltime tomography applies a wavefront raytracer and a nonlinear inversion approach. Waveform inversion is a multiscale approach in which a wavelet transform is applied in the data domain to better handle the cycle-skipping problem. By alternating the two inversions rather than performing a joint inversion, we reduce the memory requirements and avoid nonphysical scaling problems between the two approaches. Using one synthetic and two real data examples, we determine that alternating inversions minimize two separate objective functions at the same time and constrain the near-surface structures fairly well compared with the waveform inversion method alone. For the field examples, the new method avoids generating the obvious artifacts and provides results consistent with the geology analysis of those areas.

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8

Baglivo, Cristina, Marina Bonomolo, and Paolo Maria Congedo. "Modeling of Light Pipes for the Optimal Disposition in Buildings." Energies 12, no. 22 (November 13, 2019): 4323. http://dx.doi.org/10.3390/en12224323.

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A light pipe is an excellent solution to transport and distribute daylight into environments without or with little lighting, guaranteeing comfort inside the rooms. As stated in the literature, the evaluation of the performances of light pipes presents numerous complexities, making the work very difficult for technicians and designers. This study is aimed to present a methodology that is able to identify the potential of light pipes using indices such as daylight autonomy (DA), continuous daylight autonomy (DAc), and useful daylight illuminance (UDI). This paper presents an analysis of daylight obtained by several configurations of simple models of light pipes installed into a 5 × 5 m plant area room. All simulations are carried out in a DAYSIM environment, which allows calculating the annual availability of daylight based on a RADIANCE raytracer backward. Several daylight conditions were analyzed for different light pipe configurations, considering different pipe lengths and a variable number of light pipes. The light pipes are tested also in the horizontal position, for different orientations. The results of all the combinations were compared with the performances of a window with dimensions equal to 1/8 of the internal surface, which was in accordance with the minimum value to be guaranteed by the Italian Regulation (D.M. 5 July 1975 n. 190) for different orientations. The results indicated a difference in daylight distribution, showing a strong correlation between the percentage levels of DA and DAc with the length and number of pipes, during different periods of the year. The simulated model is strongly influenced by the aspect ratio (R = diameter/length). The results show that the illuminance levels decrease drastically, increasing the length.

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9

Kowalski, S. B., and H. A. Enge. "The ion-optical program raytrace." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 258, no. 3 (August 1987): 407. http://dx.doi.org/10.1016/0168-9002(87)90921-1.

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10

Khonkar, H. E. I., and A. A. M. Sayigh. "Raytrace for compound parabolic concentrator." Renewable Energy 5, no. 1-4 (August 1994): 376–83. http://dx.doi.org/10.1016/0960-1481(94)90400-6.

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11

Ferretti, G., D. Spallarossa, D. Bindi, P. Augliera, and M. Cattaneo. "Comparison of two “pseudo-bending” raytracers." Physics of the Earth and Planetary Interiors 123, no. 2-4 (April 2001): 115–26. http://dx.doi.org/10.1016/s0031-9201(00)00205-3.

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12

García-Botella, Angel, Lun Jiang, and Roland Winston. "Flowline Optical Simulation to Refractive/Reflective 3D Systems: Optical Path Length Correction." Photonics 6, no. 4 (September 28, 2019): 101. http://dx.doi.org/10.3390/photonics6040101.

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Nonimaging optics is focused on the study of techniques to design optical systems for the purpose of energy transfer instead of image forming. The flowline optical design method, based on the definition of the geometrical flux vector J, is one of these techniques. The main advantage of the flowline method is its capability to visualize and estimate how radiant energy is transferred by the optical systems using the concepts of vector field theory, such as field line or flux tube, which overcomes traditional raytrace methods. The main objective this paper is to extend the flowline method to analyze and design real 3D concentration and illumination systems by the development of new simulation techniques. In this paper, analyzed real 3D refractive and reflective systems using the flowline vector potential method. A new constant term of optical path length is introduced, similar and comparable to the gauge invariant, which produces a correction to enable the agreement between raytrace- and flowline-based computations. This new optical simulation methodology provides traditional raytrace results, such as irradiance maps, but opens new perspectives to obtaining higher precision with lower computation time. It can also provide new information for the vector field maps of 3D refractive/reflective systems.

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13

Dantzler, Andrew A. "Encircled energy correction method for raytrace programs." Applied Optics 27, no. 24 (December 15, 1988): 5001. http://dx.doi.org/10.1364/ao.27.005001.

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14

Greivenkamp, John E., and Jim Schwiegerling. "Modeling Soft Contact Lenses in Raytrace Code." Applied Optics 34, no. 34 (December 1, 1995): 8076. http://dx.doi.org/10.1364/ao.34.008076.

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15

Lindlein, Norbert. "Simulation of micro-optical array systems with RAYTRACE." Optical Engineering 37, no. 6 (June 1, 1998): 1809. http://dx.doi.org/10.1117/1.601725.

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16

Eik, M., and H. Herrmann. "Raytraced images for testing the reconstruction of fibre orientation distributions." Proceedings of the Estonian Academy of Sciences 61, no. 2 (2012): 128. http://dx.doi.org/10.3176/proc.2012.2.05.

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17

Zawdie, K. A., J. D. Huba, D. P. Drob, and P. A. Bernhardt. "A coupled ionosphere-raytrace model for high-power HF heating." Geophysical Research Letters 42, no. 22 (November 23, 2015): 9650–56. http://dx.doi.org/10.1002/2015gl066673.

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18

Leviton, Douglas B., and James W. Leitch. "Experimental and raytrace results for throat-to-throat compound parabolic concentrators." Applied Optics 25, no. 16 (August 15, 1986): 2821. http://dx.doi.org/10.1364/ao.25.002821.

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19

YANAGAWA, Takumi, Hitoshi SAKAGAMI, Atsushi SUNAHARA, and Hideo NAGATOMO. "Implosion Simulation by Hydro Code Coupled with Laser Absorption using New Raytrace Algorithm." Plasma and Fusion Research 9 (2014): 3404090. http://dx.doi.org/10.1585/pfr.9.3404090.

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20

Liner, Christopher L. "Theory of a 2.5-D acoustic wave equation for constant density media." GEOPHYSICS 56, no. 12 (December 1991): 2114–17. http://dx.doi.org/10.1190/1.1443025.

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The theory of 2.5-dimensional (2.5-D) wave propagation (Bleistein, 1986) allows efficient computation of 3-D wavefields in c(x, z) acoustic media when the source and receivers lie in a common y-plane (assumed to be y = 0 in this paper). It is really a method of efficiently computing an inplane 3-D wavefield in media with one symmetry axis. The idea is to raytrace the wavefield in the (x, z)-plane while allowing for out‐of‐plane spreading. In this way 3-D amplitude decay is honored without 3-D ray tracing. This theory has its conceptual origin in work by Ursin (1978) and Hubral (1978). Bleistein (1986) gives an excellent overview and detailed reference to earlier work.

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21

Koch, Jeffrey A., Thomas P. Bernat, Gilbert W. Collins, Bruce A. Hammel, Andrew J. MacKinnon, Charles H. Still, James D. Sater, and Donald N. Bittner. "Numerical Raytrace Verification of Optical Diagnostics of Ice Surface Roughness for Inertial Confinement Fusion Experiments." Fusion Science and Technology 43, no. 1 (January 2003): 55–66. http://dx.doi.org/10.13182/fst03-a249.

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22

Autio, Hanna, Nikolaos-Georgios Vardaxis, and Delphine Bard Hagberg. "The Influence of Different Scattering Algorithms on Room Acoustic Simulations in Rectangular Rooms." Buildings 11, no. 9 (September 17, 2021): 414. http://dx.doi.org/10.3390/buildings11090414.

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Raytracing is a widespread tool for room acoustic simulations, and one of its main advantages is the inclusion of surface scattering. Although surface scattering has been acknowledged as a central aspect of accurate raytracing simulations for many years, there is ongoing research into its effects and how to implement it better. This study evaluates three different algorithms for surface scattering in raytracers, referred to as on–off scattering, perturbation scattering, and diffuse field scattering. Their theoretical foundation is discussed, and the physical accuracy of the resulting simulations is evaluated by comparing simulated room acoustic parameters to measurements. It is found that the choice of surface scattering algorithm has a significant impact on the simulation outcomes, both in terms of physical accuracy and in terms of usability. Additionally, there are differences in the parametrization of surface scattering depending on the algorithm chosen. Of the three tested algorithms, the most commonly used algorithm (on–off scattering) seems to have the best properties for simulations.

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23

Vogel, J. K., M. J. Pivovaroff, B. Kozioziemski, C. C. Walton, J. Ayers, P. Bell, D. Bradley, et al. "Design and raytrace simulations of a multilayer-coated Wolter x-ray optic for the Z machine at Sandia National Laboratories." Review of Scientific Instruments 89, no. 10 (October 2018): 10G113. http://dx.doi.org/10.1063/1.5038811.

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24

Donovan, Benjamin D., Randall L. McEntaffer, Casey T. DeRoo, James H. Tutt, Fabien Grisé, Chad M. Eichfeld, Oren Z. Gall, et al. "Performance Testing of a Large-Format X-ray Reflection Grating Prototype for a Suborbital Rocket Payload." Journal of Astronomical Instrumentation 09, no. 04 (November 27, 2020): 2050017. http://dx.doi.org/10.1142/s2251171720500178.

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The soft X-ray grating spectrometer on board the Off-plane Grating Rocket Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum of an astrophysical object when it is launched via suborbital rocket. Paramount to the success of the spectrometer are the performance of the [Formula: see text] reflection gratings populating its reflection grating assembly. To test current grating fabrication capabilities, a grating prototype for the payload was fabricated via electron-beam lithography at The Pennsylvania State University’s Materials Research Institute and was subsequently tested for performance at Max Planck Institute for Extraterrestrial Physics’ PANTER X-ray Test Facility. Bayesian modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling indicated that the grating achieved the OGRE single-grating resolution requirement of [Formula: see text] at the 94% confidence level. The resulting [Formula: see text] posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite [Formula: see text] parameter space was sampled and the model could not constrain the upper bound of [Formula: see text] to less than infinity. Raytrace simulations of the tested system found that the observed data can be reproduced with a grating performing at [Formula: see text]. It is therefore postulated that the behavior of the obtained [Formula: see text] posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on [Formula: see text]. Implications of these results and improvements to the test setup are discussed.

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25

"Technology Tips: Creating Three-Dimensional Scenes." Mathematics Teacher 98, no. 6 (February 2005): 394–98. http://dx.doi.org/10.5951/mt.98.6.0394.

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In this month's “Technology Tips,” Norm Krumpe introduces readers to Persistence of Vision Raytracer (POV–Ray), a free computer program for creating photo–realistic, three–dimensional scenes. The first version of POVRay was created fifteen years ago, and the current version 3.6 is now available for most computer platforms, including Macintosh, Windows, and Linux. You can download the software for free, or you can order a CD–ROM copy from POV–Ray's main Web site, at povray.org.

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26

Sobota, Branislav, Štefan Korečko, Csaba Szabó, and František Hrozek. "Acceleration of ray tracing method using predictive evaluation and GPGPU technology." Open Computer Science 4, no. 3 (January 1, 2014). http://dx.doi.org/10.2478/s13537-014-0221-6.

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AbstractRay tracing is one of computer graphics methods for achieving the most realistic outputs. Its main disadvantage is high computation demands. Removal of this disadvantage is possible using parallelization due to the fact that the ray tracing method is inherently parallel. Solution presented in this article uses GPGPU (general-purpose computing on graphics processing units) technology and a predictive evaluation for the acceleration of ray tracing method. The CUDA C was selected as a GPGPU language and it was used for a conversion of a raytracer core. The main reason for choosing this language was usage of the Tesla C1060 graphics card. The predictive evaluation of a scene was based on the fact that total computation time increases proportionally with resolution. This evaluation allows selection of the optimal scene division for the parallel ray tracing. In tests, proposed GPGPU solution reached accelerations up to 28.3× comparing to CPU.

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27

Geißendörfer, Stefan, Karsten von Maydell, and Carsten Agert. "Numerical 3D-Simulation of Micromorph Silicon Thin Film Solar Cells." MRS Proceedings 1321 (2011). http://dx.doi.org/10.1557/opl.2011.934.

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ABSTRACTIn this contribution 1, 2 and 3-dimensional simulations of micromorph silicon solar cells are presented. In order to simulate solar cells with rough interfaces, the surface topographies were measured via atomic force microscopy (AFM) and transferred into the commercial software Sentaurus TCAD (Synopsys). The model of the structure includes layer thicknesses and optoelectronic parameters like complex refractive index and defect structure. Results of the space resolved optical generation rates by using of the optical solver Raytracer are presented. The space resolved optical generation rate inside the semiconductor layers depends on the structure of the transparent conductive oxides (TCO) interface. In this contribution the influence of different optical generation rates on the electrical characteristics of the solar cell device are investigated. Furthermore, the optical and electrical results of the 1D, 2D and 3D structures, which have equal layer thicknesses and optoelectronic parameters, are compared.

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28

Do-Duc, Hao, and Vinh Ngo-Quang. "Analyzing Data Reusability of Raytrace Application in Splash2 Benchmark." International Journal of Advanced Computer Science and Applications 7, no. 7 (2016). http://dx.doi.org/10.14569/ijacsa.2016.070762.

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29

"STUDY OF SOLAR BASED VERTICAL FARMING SYSTEMS WITH RAYTRACED DAYLIGHTING ANALYSIS AND VISUALIZATIONS." Carpathian Journal of Food Science and Technology, December 31, 2020, 21–30. http://dx.doi.org/10.34302/crpjfst/2020.12.4.3.

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30

"STUDY OF SOLAR BASED VERTICAL FARMING SYSTEMS WITH RAYTRACED DAYLIGHTING ANALYSIS AND VISUALIZATIONS." Carpathian Journal of Food Science and Technology, December 31, 2020, 21–30. http://dx.doi.org/10.34302/crpjfst/2020.12.4.3.

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