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<!-- RCSid $Id$ --> |
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<head> |
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<title> |
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The RADIANCE 5.1 Synthetic Imaging System |
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The RADIANCE 6.0 Synthetic Imaging System |
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</title> |
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</head> |
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<body> |
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<p> |
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<h1> |
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The RADIANCE 5.1 Synthetic Imaging System |
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The RADIANCE 6.0 Synthetic Imaging System |
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</h1> |
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<p> |
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(ovals). |
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The central program is <i>rpict</i>, which produces a picture from a scene |
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description. |
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<i>Rview</i> is a variation of rpict that computes and displays images |
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<i>Rvu</i> is a variation of rpict that computes and displays images |
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interactively, and rtrace computes single ray values. |
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Other programs (not shown) connect many of these elements together, |
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such as the executive programs |
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Also, rather than roughness, specular power is used, which has no |
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physical meaning other than larger numbers are equivalent to a smoother |
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surface. |
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Unlike other material types, total reflectance is the sum of |
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diffuse and specular colors, and should be adjusted accordingly. |
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<pre> |
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mod ashik2 id |
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4+ ux uy uz funcfile transform |
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<p> |
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<dt> |
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<a NAME="aBSDF"> |
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<b>aBSDF</b> |
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</a> |
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<dd> |
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The aBSDF material is identical to the BSDF type with two |
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important differences. First, proxy geometry is not |
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supported, so there is no thickness parameter. Second, an |
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aBSDF is assumed to have some specular through component |
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(the ’a’ stands for "aperture"), |
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which is treated specially during the direct calculation |
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and when viewing the material. Based on the BSDF data, the |
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coefficient of specular transmission is determined and used |
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for modifying unscattered shadow and view rays. |
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|
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<pre> |
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mod aBSDF id |
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5+ BSDFfile ux uy uz funcfile transform |
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0 |
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0|3|6|9 |
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rfdif gfdif bfdif |
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rbdif gbdif bbdif |
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rtdif gtdif btdif |
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</pre> |
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|
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<p> |
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If a material has no specular transmitted component, it is |
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much better to use the BSDF type with a zero thickness |
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than to use aBSDF. |
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<p> |
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|
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<dt> |
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<a NAME="Antimatter"> |
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<b>Antimatter</b> |
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</a> |
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A section of text meant to depict a picture, perhaps using a special purpose font such as hexbit4x1.fnt, calls for uniform spacing. |
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Reasonable magnitudes for proportional spacing are between 0.1 (for tightly spaced characters) and 0.3 (for wide spacing). |
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<p> |
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<dt> |
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<a NAME="Spectrum"> |
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<b>Spectrum</b> |
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</a> |
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|
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<dd> |
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The spectrum primitive is the most basic type for introducing spectral |
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color to a material. |
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Since materials only provide RGB parameters, spectral patterns |
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are the only way to superimpose wavelength-dependent behavior. |
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|
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<pre> |
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mod spectrum id |
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0 |
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0 |
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5+ nmA nmB s1 s2 .. sN |
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</pre> |
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|
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<p> |
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The first two real arguments indicate the extrema of the |
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spectral range in nanometers. |
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Subsequent real values correspond to multipliers at each wavelength. |
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The nmA wavelength may be greater or less than nmB, |
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but they may not be equal, and their ordering matches |
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the order of the spectral values. |
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A minimum of 3 values must be given, which would act |
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more or less the same as a constant RGB multiplier. |
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As with RGB values, spectral quantities normally range between 0 |
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and 1 at each wavelength, or average to 1.0 against a standard |
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sensitivity functions such as V(lambda). |
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The best results obtain when the spectral range and number |
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of samples match rendering options, though resampling will handle |
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any differences, zero-filling wavelenths outside the nmA to nmB |
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range. |
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A warning will be issued if the given wavelength range does not |
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adequately cover the visible spectrum. |
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|
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<p> |
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|
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<dt> |
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<a NAME="Specfile"> |
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<b>Specfile</b> |
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</a> |
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<dd> |
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The specfile primitive is equivalent to the spectrum type, but |
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the wavelength range and values are contained in a 1-dimensional |
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data file. |
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This may be a more convenient way to specify a spectral color, |
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especially one corresponding to a standard illuminant such as D65 |
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or a library of measured spectra. |
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|
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<pre> |
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mod specfile id |
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1 datafile |
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0 |
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0 |
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</pre> |
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<p> |
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As with the spectrum type, rendering wavelengths outside the defined |
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range will be zero-filled. |
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Unlike the spectrum type, the file may contain non-uniform samples. |
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<p> |
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|
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<dt> |
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<a NAME="Specfunc"> |
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<b>Specfunc</b> |
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</a> |
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|
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<dd> |
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The specfunc primitive offers dynamic control over a spectral |
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pattern, similar to the colorfunc type. |
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|
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<pre> |
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mod specfunc id |
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2+ sval funcfile transform |
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0 |
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2+ nmA nmB A3 .. |
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</pre> |
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|
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<p> |
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Like the spectrum primitive, the wavelength range is specified |
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in the first two real arguments, and additional real values are |
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set in the evaluation context. |
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This function is fed a wavelenth sample |
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between nmA and nmB as its only argument, |
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and it returns the corresponding spectral intensity. |
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|
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</dl> |
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|
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<p> |
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directs the use of a scene description. |
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<ul> |
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<li> |
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< |
<a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rview</b></a> is ray-tracing program for viewing a scene interactively. |
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<a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rvu</b></a> is ray-tracing program for viewing a scene interactively. |
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When the user specifies a new perspective, rvu quickly displays a rough image on the terminal, |
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then progressively increases the resolution as the user looks on. |
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He can select a particular section of the image to improve, or move to a different view and start over. |
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or converted a standard image format using one of the following |
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<b>translators</b>: |
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<ul> |
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<li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b> |
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<li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b></a> |
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converts to and from BMP image format. |
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<li> <a HREF="../man_html/ra_ppm.1.html"><b>Ra_ppm</b></a> |
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converts to and from Poskanzer Portable Pixmap formats. |
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<pre> |
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The Radiance Software License, Version 1.0 |
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|
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< |
Copyright (c) 1990 - 2014 The Regents of the University of California, |
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Copyright (c) 1990 - 2021 The Regents of the University of California, |
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through Lawrence Berkeley National Laboratory. All rights reserved. |
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|
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Redistribution and use in source and binary forms, with or without |
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</h2> |
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<p> |
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<ul> |
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<li>Ward, Gregory J., Bruno Bueno, David Geisler-Moroder, |
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Lars O. Grobe, Jacob C. Jonsson, Eleanor |
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S. Lee, Taoning Wang, Helen Rose Wilson, |
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"<a href="https://doi.org/10.1016/j.enbuild.2022.111890">Daylight |
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Simulation Workflows Incorporating Measured Bidirectional |
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Scattering Distribution Functions</a>" |
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<em>Energy & Buildings</em>, Vol. 259, No. 11890, 2022. |
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<li>Wang, Taoning, Gregory Ward, Eleanor Lee, |
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"<a href="https://authors.elsevier.com/a/1XQ0a1M7zGwT7v">Efficient |
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modeling of optically-complex, non-coplanar exterior shading: |
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Validation of matrix algebraic methods</a>" |
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<em>Energy & Buildings</em>, vol. 174, pp. 464-83, Sept. 2018. |
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<li>Lee, Eleanor S., David Geisler-Moroder, Gregory Ward, |
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"<a href="https://eta.lbl.gov/sites/default/files/publications/solar_energy.pdf">Modeling |
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the direct sun component in buildings using matrix |
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algebraic approaches: Methods and |
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validation</a>," <em>Solar Energy</em>, |
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vol. 160, 15 January 2018, pp 380-395. |
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<li>Narain, Rahul, Rachel A. Albert, Abdullah Bulbul, |
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Gregory J. Ward, Marty Banks, James F. O'Brien, |
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"<a href="http://graphics.berkeley.edu/papers/Narain-OPI-2015-08/index.html">Optimal |
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Presentation of Imagery with Focus |
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Cues on Multi-Plane Displays</a>," |
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<em>SIGGRAPH 2015</em>. |
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<li>Ward, Greg, Murat Kurt, and Nicolas Bonneel, |
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"<a href="papers/WMAM14_Tensor_Tree_Representation.pdf">Reducing |
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Anisotropic BSDF Measurement to Common Practice</a>," |
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<em>Workshop on Material Appearance Modeling</em>, 2014. |
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<li>Banks, Martin, Abdullah Bulbul, Rachel Albert, Rahul Narain, |
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James F. O'Brien, Gregory Ward, |
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"<a href="http://graphics.berkeley.edu/papers/Banks-TPO-2014-05/index.html">The |
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Perception of Surface Material from Disparity and Focus Cues</a>," |
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<em>VSS 2014</em>. |
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<li>McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee, |
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"<a href="http://gaia.lbl.gov/btech/papers/4414.pdf"> |
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A validation of a ray-tracing tool used to generate |
