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# Line 1 | Line 1
1   <html>
2 + <!-- RCSid $Id$ -->
3   <head>
4   <title>
5 < The RADIANCE 4.1 Synthetic Imaging System
5 > The RADIANCE 5.4 Synthetic Imaging System
6   </title>
7   </head>
8   <body>
# Line 9 | Line 10 | The RADIANCE 4.1 Synthetic Imaging System
10   <p>
11  
12   <h1>
13 < The RADIANCE 4.1 Synthetic Imaging System
13 > The RADIANCE 5.4 Synthetic Imaging System
14   </h1>
15  
16   <p>
# Line 82 | Line 83 | The diagram in Figure 1 shows the flow between program
83   (ovals).  
84   The central program is <i>rpict</i>, which produces a picture from a scene
85   description.
86 < <i>Rview</i> is a  variation  of  rpict  that  computes  and displays images
86 > <i>Rvu</i> is a  variation  of  rpict  that  computes  and displays images
87   interactively, and rtrace computes single ray values.
88   Other programs (not shown) connect many of these elements together,
89   such as the executive programs
# Line 797 | Line 798 | unless the line integrals consider enclosed geometry.
798  
799   <dd>
800          Trans2 is the anisotropic version of <a HREF="#Trans">trans</a>.  
801 <        The string arguments  are  the same as for plastic2, and the real arguments are the same as  for  trans  but  with  an  additional roughness value.
801 >        The string arguments  are  the same as for <a HREF="#Plastic2">plastic2</a>,
802 >        and the real arguments are the same as  for  trans  but  with  an  additional roughness value.
803  
804   <pre>
805          mod trans2 id
# Line 809 | Line 811 | unless the line integrals consider enclosed geometry.
811   <p>
812  
813   <dt>
814 +        <a NAME="Ashik2">
815 +        <b>Ashik2</b>
816 +        </a>
817 +
818 + <dd>
819 +        Ashik2 is the anisotropic reflectance model by Ashikhmin & Shirley.
820 +        The string arguments are the same as for <a HREF="#Plastic2">plastic2</a>, but the real
821 +        arguments have additional flexibility to specify the specular color.
822 +        Also, rather than roughness, specular power is used, which has no
823 +        physical meaning other than larger numbers are equivalent to a smoother
824 +        surface.
825 +        Unlike other material types, total reflectance is the sum of
826 +        diffuse and specular colors, and should be adjusted accordingly.
827 + <pre>
828 +        mod ashik2 id
829 +        4+ ux uy uz funcfile transform
830 +        0
831 +        8 dred dgrn dblu sred sgrn sblu u-power v-power
832 + </pre>
833 +
834 + <p>
835 +
836 + <dt>
837          <a NAME="Dielectric">
838          <b>Dielectric</b>
839          </a>
# Line 1131 | Line 1156 | unless the line integrals consider enclosed geometry.
1156   <p>
1157  
1158   <dt>
1159 +        <a NAME="aBSDF">
1160 +        <b>aBSDF</b>
1161 +        </a>
1162 +
1163 + <dd>
1164 +        The aBSDF material is identical to the BSDF type with two
1165 +        important differences.  First, proxy geometry is not
1166 +        supported, so there is no thickness parameter.  Second, an
1167 +        aBSDF is assumed to have some specular through component
1168 +        (the &rsquo;a&rsquo; stands for &quot;aperture&quot;),
1169 +        which is treated specially during the direct calculation
1170 +        and when viewing the material.  Based on the BSDF data, the
1171 +        coefficient of specular transmission is determined and used
1172 +        for modifying unscattered shadow and view rays.
1173 +
1174 + <pre>
1175 +        mod aBSDF id
1176 +        5+ BSDFfile ux uy uz funcfile transform
1177 +        0
1178 +        0|3|6|9
1179 +             rfdif gfdif bfdif
1180 +             rbdif gbdif bbdif
1181 +             rtdif gtdif btdif
1182 + </pre>
1183 +
1184 + <p>
1185 +        If a material has no specular transmitted component, it is
1186 +        much better to use the BSDF type with a zero thickness
1187 +        than to use aBSDF.
1188 + <p>
1189 +
1190 + <dt>
1191          <a NAME="Antimatter">
1192          <b>Antimatter</b>
1193          </a>
# Line 1414 | Line 1471 | or:
1471   </h4>
1472  
1473   A mixture is a blend of one or more materials or textures and patterns.
1474 + Blended materials should not be light source types or virtual source types.
1475   The basic types are given below.
1476  
1477   <p>
# Line 1486 | Line 1544 | A mixfunc mixes  two  modifiers  procedurally.   It  i
1544          arguments, the red, green and blue values
1545          corresponding to the pixel at (u,v).
1546  
1489 – </dl>
1547   <p>
1548  
1549   <dt>
# Line 1752 | Line 1809 | The details of this process  are  not  important, but
1809   directs the use of a scene description.
1810   <ul>
1811   <li>
1812 < <a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rview</b></a>  is  ray-tracing  program  for  viewing  a  scene interactively.  
1812 > <a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rvu</b></a>  is  ray-tracing  program  for  viewing  a  scene interactively.  
1813   When  the user specifies a new perspective, rvu quickly displays a rough image on the  terminal,  
1814   then progressively increases the resolution as the user looks on.
1815   He can select a particular section of the image to  improve, or  move  to  a different view and start over.  
# Line 1788 | Line 1845 | Pictures may be displayed directly under X11 using the
1845   or converted a standard image format using one of the following
1846   <b>translators</b>:
1847          <ul>
1848 <        <li> <b>Ra_avs</b>
1849 <                converts to and from AVS image format.
1793 <        <li> <a HREF="../man_html/ra_pict.1.html"><b>Ra_pict</b></a>
1794 <                converts to Macintosh 32-bit PICT2 format.
1848 >        <li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b></a>
1849 >                converts to and from BMP image format.
1850          <li> <a HREF="../man_html/ra_ppm.1.html"><b>Ra_ppm</b></a>
1851                  converts to and from Poskanzer Portable Pixmap formats.
1797 –        <li> <a HREF="../man_html/ra_pr.1.html"><b>Ra_pr</b></a>
1798 –                converts to and from Sun 8-bit rasterfile format.
1799 –        <li> <a HREF="../man_html/ra_pr24.1.html"><b>Ra_pr24</b></a>
1800 –                converts to and from Sun 24-bit rasterfile format.
1852          <li> <a HREF="../man_html/ra_ps.1.html"><b>Ra_ps</b></a>
1853                  converts to PostScript color and greyscale formats.
1854          <li> <a HREF="../man_html/ra_rgbe.1.html"><b>Ra_rgbe</b></a>
# Line 1823 | Line 1874 | or converted a standard image format using one of the
1874   <pre>
1875   The Radiance Software License, Version 1.0
1876  
1877 < Copyright (c) 1990 - 2010 The Regents of the University of California,
1877 > Copyright (c) 1990 - 2021 The Regents of the University of California,
1878   through Lawrence Berkeley National Laboratory.   All rights reserved.
1879  
1880   Redistribution and use in source and binary forms, with or without
# Line 1896 | Line 1947 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1947   </h2>
1948   <p>
1949   <ul>
1950 +    <li>Wang, Taoning, Gregory Ward, Eleanor Lee,
1951 +      &quot;<a href="https://authors.elsevier.com/a/1XQ0a1M7zGwT7v">Efficient
1952 +      modeling of optically-complex, non-coplanar exterior shading:
1953 +      Validation of matrix algebraic methods</a>&quot;
1954 +      <em>Energy & Buildings</em>, vol. 174, pp. 464-83, Sept. 2018.
1955 +    <li>Lee, Eleanor S., David Geisler-Moroder, Gregory Ward,
1956 +      &quot;<a href="https://eta.lbl.gov/sites/default/files/publications/solar_energy.pdf">Modeling
1957 +      the direct sun component in buildings using matrix
1958 +      algebraic approaches: Methods and
1959 +      validation</a>,&quot; <em>Solar Energy</em>,
1960 +      vol. 160, 15 January 2018, pp 380-395.
1961 +    <li>Narain, Rahul, Rachel A. Albert, Abdullah Bulbul,
1962 +       Gregory J. Ward, Marty Banks, James F. O'Brien,
1963 +       &quot;<a href="http://graphics.berkeley.edu/papers/Narain-OPI-2015-08/index.html">Optimal
1964 +       Presentation of Imagery with Focus
1965 +       Cues on Multi-Plane Displays</a>,&quot;
1966 +       <em>SIGGRAPH 2015</em>.
1967 +    <li>Ward, Greg, Murat Kurt, and Nicolas Bonneel,
1968 +        &quot;<a href="papers/WMAM14_Tensor_Tree_Representation.pdf">Reducing
1969 +        Anisotropic BSDF Measurement to Common Practice</a>,&quot;
1970 +        <em>Workshop on Material Appearance Modeling</em>, 2014.
1971 +    <li>Banks, Martin, Abdullah Bulbul, Rachel Albert, Rahul Narain,
1972 +        James F. O'Brien, Gregory Ward,
1973 +        &quot;<a href="http://graphics.berkeley.edu/papers/Banks-TPO-2014-05/index.html">The
1974 +        Perception of Surface Material from Disparity and Focus Cues</a>,&quot;
1975 +        <em>VSS 2014</em>.
1976 +    <li>McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee,
1977 +        &quot;<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">
1978 +        A validation of a ray-tracing tool used to generate
1979 +        bi-directional scattering distribution functions for
1980 +        complex fenestration systems</a>,&quot;
1981 +        <em>Solar Energy</em>, 98, 404-14,
1982 +        November 2013.
1983      <li>Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson,
1984          &quot;<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">Simulating
1985          the Daylight Performance of Complex Fenestration Systems
1986          Using Bidirectional Scattering Distribution Functions within
1987          Radiance</a>,&quot;
1988 <        <em>Journal of the Illuminating Engineering Soc. of North America</em>,
1988 >        <em>Leukos</em>, 7(4)
1989          April 2011.
1990      <li>Cater, Kirsten, Alan Chalmers, Greg Ward,
1991          &quot;<a href="http://www.anyhere.com/gward/papers/egsr2003.pdf">Detail to Attention:

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