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# Line 2 | Line 2
2   <!-- RCSid $Id$ -->
3   <head>
4   <title>
5 < The RADIANCE 5.1 Synthetic Imaging System
5 > The RADIANCE 5.4 Synthetic Imaging System
6   </title>
7   </head>
8   <body>
# Line 10 | Line 10 | The RADIANCE 5.1 Synthetic Imaging System
10   <p>
11  
12   <h1>
13 < The RADIANCE 5.1 Synthetic Imaging System
13 > The RADIANCE 5.4 Synthetic Imaging System
14   </h1>
15  
16   <p>
# Line 83 | 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 798 | 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 810 | 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 + <pre>
826 +        mod ashik2 id
827 +        4+ ux uy uz funcfile transform
828 +        0
829 +        8 dred dgrn dblu sred sgrn sblu u-power v-power
830 + </pre>
831 +
832 + <p>
833 +
834 + <dt>
835          <a NAME="Dielectric">
836          <b>Dielectric</b>
837          </a>
# Line 1132 | Line 1154 | unless the line integrals consider enclosed geometry.
1154   <p>
1155  
1156   <dt>
1157 +        <a NAME="aBSDF">
1158 +        <b>aBSDF</b>
1159 +        </a>
1160 +
1161 + <dd>
1162 +        The aBSDF material is identical to the BSDF type with two
1163 +        important differences.  First, proxy geometry is not
1164 +        supported, so there is no thickness parameter.  Second, an
1165 +        aBSDF is assumed to have some specular through component
1166 +        (the &rsquo;a&rsquo; stands for &quot;aperture&quot;),
1167 +        which is treated specially during the direct calculation
1168 +        and when viewing the material.  Based on the BSDF data, the
1169 +        coefficient of specular transmission is determined and used
1170 +        for modifying unscattered shadow and view rays.
1171 +
1172 + <pre>
1173 +        mod aBSDF id
1174 +        5+ BSDFfile ux uy uz funcfile transform
1175 +        0
1176 +        0|3|6|9
1177 +             rfdif gfdif bfdif
1178 +             rbdif gbdif bbdif
1179 +             rtdif gtdif btdif
1180 + </pre>
1181 +
1182 + <p>
1183 +        If a material has no specular transmitted component, it is
1184 +        much better to use the BSDF type with a zero thickness
1185 +        than to use aBSDF.
1186 + <p>
1187 +
1188 + <dt>
1189          <a NAME="Antimatter">
1190          <b>Antimatter</b>
1191          </a>
# Line 1415 | Line 1469 | or:
1469   </h4>
1470  
1471   A mixture is a blend of one or more materials or textures and patterns.
1472 + Blended materials should not be light source types or virtual source types.
1473   The basic types are given below.
1474  
1475   <p>
# Line 1487 | Line 1542 | A mixfunc mixes  two  modifiers  procedurally.   It  i
1542          arguments, the red, green and blue values
1543          corresponding to the pixel at (u,v).
1544  
1490 – </dl>
1545   <p>
1546  
1547   <dt>
# Line 1753 | Line 1807 | The details of this process  are  not  important, but
1807   directs the use of a scene description.
1808   <ul>
1809   <li>
1810 < <a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rview</b></a>  is  ray-tracing  program  for  viewing  a  scene interactively.  
1810 > <a NAME="rvu" HREF="../man_html/rvu.1.html"><b>Rvu</b></a>  is  ray-tracing  program  for  viewing  a  scene interactively.  
1811   When  the user specifies a new perspective, rvu quickly displays a rough image on the  terminal,  
1812   then progressively increases the resolution as the user looks on.
1813   He can select a particular section of the image to  improve, or  move  to  a different view and start over.  
# Line 1789 | Line 1843 | Pictures may be displayed directly under X11 using the
1843   or converted a standard image format using one of the following
1844   <b>translators</b>:
1845          <ul>
1846 <        <li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b>
1846 >        <li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b></a>
1847                  converts to and from BMP image format.
1848          <li> <a HREF="../man_html/ra_ppm.1.html"><b>Ra_ppm</b></a>
1849                  converts to and from Poskanzer Portable Pixmap formats.
# Line 1818 | Line 1872 | or converted a standard image format using one of the
1872   <pre>
1873   The Radiance Software License, Version 1.0
1874  
1875 < Copyright (c) 1990 - 2014 The Regents of the University of California,
1875 > Copyright (c) 1990 - 2021 The Regents of the University of California,
1876   through Lawrence Berkeley National Laboratory.   All rights reserved.
1877  
1878   Redistribution and use in source and binary forms, with or without
# Line 1891 | Line 1945 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1945   </h2>
1946   <p>
1947   <ul>
1948 +    <li>Wang, Taoning, Gregory Ward, Eleanor Lee,
1949 +      &quot;<a href="https://authors.elsevier.com/a/1XQ0a1M7zGwT7v">Efficient
1950 +      modeling of optically-complex, non-coplanar exterior shading:
1951 +      Validation of matrix algebraic methods</a>&quot;
1952 +      <em>Energy & Buildings</em>, vol. 174, pp. 464-83, Sept. 2018.
1953 +    <li>Lee, Eleanor S., David Geisler-Moroder, Gregory Ward,
1954 +      &quot;<a href="https://eta.lbl.gov/sites/default/files/publications/solar_energy.pdf">Modeling
1955 +      the direct sun component in buildings using matrix
1956 +      algebraic approaches: Methods and
1957 +      validation</a>,&quot; <em>Solar Energy</em>,
1958 +      vol. 160, 15 January 2018, pp 380-395.
1959 +    <li>Narain, Rahul, Rachel A. Albert, Abdullah Bulbul,
1960 +       Gregory J. Ward, Marty Banks, James F. O'Brien,
1961 +       &quot;<a href="http://graphics.berkeley.edu/papers/Narain-OPI-2015-08/index.html">Optimal
1962 +       Presentation of Imagery with Focus
1963 +       Cues on Multi-Plane Displays</a>,&quot;
1964 +       <em>SIGGRAPH 2015</em>.
1965 +    <li>Ward, Greg, Murat Kurt, and Nicolas Bonneel,
1966 +        &quot;<a href="papers/WMAM14_Tensor_Tree_Representation.pdf">Reducing
1967 +        Anisotropic BSDF Measurement to Common Practice</a>,&quot;
1968 +        <em>Workshop on Material Appearance Modeling</em>, 2014.
1969 +    <li>Banks, Martin, Abdullah Bulbul, Rachel Albert, Rahul Narain,
1970 +        James F. O'Brien, Gregory Ward,
1971 +        &quot;<a href="http://graphics.berkeley.edu/papers/Banks-TPO-2014-05/index.html">The
1972 +        Perception of Surface Material from Disparity and Focus Cues</a>,&quot;
1973 +        <em>VSS 2014</em>.
1974      <li>McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee,
1975          &quot;<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">
1976          A validation of a ray-tracing tool used to generate

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