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Revision 1.21 by greg, Fri Sep 25 23:01:12 2015 UTC

# Line 1 | Line 1
1   <html>
2 + <!-- RCSid $Id$ -->
3   <head>
4   <title>
5 < The RADIANCE 3.8 Synthetic Imaging System
5 > The RADIANCE 5.1 Synthetic Imaging System
6   </title>
7   </head>
8   <body>
# Line 9 | Line 10 | The RADIANCE 3.8 Synthetic Imaging System
10   <p>
11  
12   <h1>
13 < The RADIANCE 3.8 Synthetic Imaging System
13 > The RADIANCE 5.1 Synthetic Imaging System
14   </h1>
15  
16   <p>
# Line 1053 | Line 1054 | unless the line integrals consider enclosed geometry.
1054   <p>
1055  
1056   <dt>
1057 +        <a NAME="BSDF">
1058 +        <b>BSDF</b>
1059 +        </a>
1060 +
1061 + <dd>
1062 +        The BSDF material type loads an XML (eXtensible Markup Language)
1063 +        file describing a bidirectional scattering distribution function.
1064 +        Real arguments to this material may define additional
1065 +        diffuse components that augment the BSDF data.
1066 +        String arguments are used to define thickness for proxied
1067 +        surfaces and the &quot;up&quot; orientation for the material.
1068 +
1069 + <pre>
1070 +        mod BSDF id
1071 +        6+ thick BSDFfile ux uy uz funcfile transform
1072 +        0
1073 +        0|3|6|9
1074 +                rfdif gfdif bfdif
1075 +                rbdif gbdif bbdif
1076 +                rtdif gtdif btdif
1077 + </pre>
1078 +
1079 + <p>
1080 +        The first string argument is a &quot;thickness&quot; parameter that may be used
1081 +        to hide detail geometry being proxied by an aggregate BSDF material.
1082 +        If a view or shadow ray hits a BSDF proxy with non-zero thickness,
1083 +        it will pass directly through as if the surface were not there.
1084 +        Similar to the illum type, this permits direct viewing and
1085 +        shadow testing of complex geometry.
1086 +        The BSDF is used when a scattered (indirect) ray hits the surface,
1087 +        and any transmitted sample rays will be offset by the thickness amount
1088 +        to avoid the hidden geometry and gather samples from the other side.
1089 +        In this manner, BSDF surfaces can improve the results for indirect
1090 +        scattering from complex systems without sacrificing appearance or
1091 +        shadow accuracy.
1092 +        If the BSDF has transmission and back-side reflection data,
1093 +        a parallel BSDF surface may be
1094 +        placed slightly less than the given thickness away from the front surface
1095 +        to enclose the complex geometry on both sides.
1096 +        The sign of the thickness is important, as it indicates
1097 +        whether the proxied geometry is behind the BSDF
1098 +        surface (when thickness is positive) or in front (when
1099 +        thickness is negative).
1100 + <p>
1101 +        The second string argument is the name of the BSDF file,
1102 +        which is found in the usual auxiliary locations.  The
1103 +        following three string parameters name variables for an
1104 +        &quot;up&quot; vector, which together with the surface
1105 +        normal, define the local coordinate system that orients the
1106 +        BSDF.  These variables, along with the thickness, are defined
1107 +        in a function file given as the next string argument.  An
1108 +        optional transform is used to scale the thickness and
1109 +        reorient the up vector.
1110 + <p>
1111 +        If no real arguments are given, the BSDF is used by itself
1112 +        to determine reflection and transmission.  If there are at
1113 +        least 3 real arguments, the first triplet is an additional
1114 +        diffuse reflectance for the front side.  At least 6 real
1115 +        arguments adds diffuse reflectance to the rear side of the
1116 +        surface.  If there are 9 real arguments, the final triplet
1117 +        will be taken as an additional diffuse transmittance.  All
1118 +        diffuse components as well as the non-diffuse transmission
1119 +        are modified by patterns applied to this material.  The
1120 +        non-diffuse reflection from either side are unaffected.
1121 +        Textures perturb the effective surface normal in the usual
1122 +        way.
1123 + <p>
1124 +        The surface normal of this type is not altered to face the
1125 +        incoming ray, so the front and back BSDF reflections may
1126 +        differ.  (Transmission is identical front-to-back by physical
1127 +        law.) If back visibility is turned off during rendering and
1128 +        there is no transmission or back-side reflection, only then
1129 +        the surface will be invisible from behind.  Unlike other
1130 +        data-driven material types, the BSDF type is fully supported
1131 +        and all parts of the distribution are properly sampled.
1132 + <p>
1133 +
1134 + <dt>
1135          <a NAME="Antimatter">
1136          <b>Antimatter</b>
1137          </a>
# Line 1365 | Line 1444 | A mixfunc mixes  two  modifiers  procedurally.   It  i
1444          which serves as a form of opacity control when used with a material.)
1445          Vname is the coefficient defined in funcfile that determines  the  influence  of  foreground.  
1446          The background coefficient is always (1-vname).  
1368 –        Since the references are not resolved until run-time,  the  last  definitions  of  the modifier id's will be used.  
1369 –        This can result in modifier loops, which are detected by the renderer.
1447  
1448   <p>
1449  
# Line 1528 | Line 1605 | If no file is needed by a given primitive because all
1605   the  required  variables  are global,  
1606   a  period  (`.')  can be given in place of the file name.  
1607   It is also possible to give an expression instead
1608 < of a  straight  variable  name  in  a scene file,
1609 < although such expressions should be kept
1533 < simple if possible.
1534 < Also, functions (requiring parameters) must be given
1608 > of a  straight  variable  name  in  a scene file.
1609 > Functions (requiring parameters) must be given
1610   as names and not as expressions.
1611  
1612   <p>
# Line 1714 | Line 1789 | Pictures may be displayed directly under X11 using the
1789   or converted a standard image format using one of the following
1790   <b>translators</b>:
1791          <ul>
1792 <        <li> <b>Ra_avs</b>
1793 <                converts to and from AVS image format.
1719 <        <li> <a HREF="../man_html/ra_pict.1.html"><b>Ra_pict</b></a>
1720 <                converts to Macintosh 32-bit PICT2 format.
1792 >        <li> <a HREF="../man_html/ra_bmp.1.html"><b>Ra_bmp</b>
1793 >                converts to and from BMP image format.
1794          <li> <a HREF="../man_html/ra_ppm.1.html"><b>Ra_ppm</b></a>
1795                  converts to and from Poskanzer Portable Pixmap formats.
1723 –        <li> <a HREF="../man_html/ra_pr.1.html"><b>Ra_pr</b></a>
1724 –                converts to and from Sun 8-bit rasterfile format.
1725 –        <li> <a HREF="../man_html/ra_pr24.1.html"><b>Ra_pr24</b></a>
1726 –                converts to and from Sun 24-bit rasterfile format.
1796          <li> <a HREF="../man_html/ra_ps.1.html"><b>Ra_ps</b></a>
1797                  converts to PostScript color and greyscale formats.
1798          <li> <a HREF="../man_html/ra_rgbe.1.html"><b>Ra_rgbe</b></a>
# Line 1749 | Line 1818 | or converted a standard image format using one of the
1818   <pre>
1819   The Radiance Software License, Version 1.0
1820  
1821 < Copyright (c) 1990 - 2006 The Regents of the University of California,
1821 > Copyright (c) 1990 - 2014 The Regents of the University of California,
1822   through Lawrence Berkeley National Laboratory.   All rights reserved.
1823  
1824   Redistribution and use in source and binary forms, with or without
# Line 1783 | Line 1852 | are met:
1852        nor may &quot;Radiance&quot; appear in their name, without prior written
1853        permission of Lawrence Berkeley National Laboratory.
1854  
1855 < THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
1855 > THIS SOFTWARE IS PROVIDED ``AS IS&quot; AND ANY EXPRESSED OR IMPLIED
1856   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1857   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1858   DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
# Line 1822 | Line 1891 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1891   </h2>
1892   <p>
1893   <ul>
1894 +    <li>McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee,
1895 +        &quot;<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">
1896 +        A validation of a ray-tracing tool used to generate
1897 +        bi-directional scattering distribution functions for
1898 +        complex fenestration systems</a>,&quot;
1899 +        <em>Solar Energy</em>, 98, 404-14,
1900 +        November 2013.
1901 +    <li>Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson,
1902 +        &quot;<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">Simulating
1903 +        the Daylight Performance of Complex Fenestration Systems
1904 +        Using Bidirectional Scattering Distribution Functions within
1905 +        Radiance</a>,&quot;
1906 +        <em>Leukos</em>, 7(4)
1907 +        April 2011.
1908      <li>Cater, Kirsten, Alan Chalmers, Greg Ward,
1909 <        &quot;<a href="papers/egsr2003.pdf">Detail to Attention:
1909 >        &quot;<a href="http://www.anyhere.com/gward/papers/egsr2003.pdf">Detail to Attention:
1910          Exploiting Visual Tasks for Selective Rendering</a>,&quot;
1911          <em>Eurographics Symposium
1912          on Rendering 2003</em>, June 2003.
1913      <li>Ward, Greg, Elena Eydelberg-Vileshin,
1914 <        ``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/egwr02/index.html">Picture Perfect RGB
1915 <        Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>,''
1914 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/egwr02/index.html">Picture Perfect RGB
1915 >        Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>,&quot;
1916          Thirteenth Eurographics Workshop on Rendering (2002),
1917          P. Debevec and S. Gibson (Editors), June 2002.
1918      <li>Ward, Gregory,
1919 <        ``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/cic01.pdf">High Dynamic Range Imaging</a>,''
1919 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/cic01.pdf">High Dynamic Range Imaging</a>,&quot;
1920          Proceedings of the Ninth Color Imaging Conference, November 2001.
1921      <li>Ward, Gregory and Maryann Simmons,
1922 <        ``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/tog99.pdf">
1922 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/tog99.pdf">
1923          The Holodeck Ray Cache: An Interactive Rendering System for Global Illumination in Nondiffuse
1924 <        Environments</a>,'' ACM Transactions on Graphics, 18(4):361-98, October 1999.
1925 <    <li>Larson, G.W., ``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/ewp98.pdf">The Holodeck: A Parallel
1926 <        Ray-caching Rendering System</a>,'' Proceedings of the Second
1924 >        Environments</a>,&quot; ACM Transactions on Graphics, 18(4):361-98, October 1999.
1925 >    <li>Larson, G.W., &quot;<a HREF="http://www.anyhere.com/gward/papers/ewp98.pdf">The Holodeck: A Parallel
1926 >        Ray-caching Rendering System</a>,&quot; Proceedings of the Second
1927          Eurographics Workshop on Parallel Graphics and Visualisation,
1928          September 1998.
1929      <li>Larson, G.W. and R.A. Shakespeare,
# Line 1848 | Line 1931 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1931          the Art and Science of Lighting Visualization</em></a>,
1932          Morgan Kaufmann Publishers, 1998.
1933      <li>Larson, G.W., H. Rushmeier, C. Piatko,
1934 <        ``<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility
1934 >        &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility
1935          Matching Tone Reproduction Operator for
1936 <        High Dynamic Range Scenes</a>,'' LBNL Technical Report 39882,
1936 >        High Dynamic Range Scenes</a>,&quot; LBNL Technical Report 39882,
1937          January 1997.
1938 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making
1939 <        Global Illumination User-Friendly</a>,'' Sixth
1938 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making
1939 >        Global Illumination User-Friendly</a>,&quot; Sixth
1940          Eurographics Workshop on Rendering, Springer-Verlag,
1941          Dublin, Ireland, June 1995.</li>
1942      <li>Rushmeier, H., G. Ward, C. Piatko, P. Sanders, B. Rust,
1943 <        ``<a HREF="http://radsite.lbl.gov/mgf/compare.html">
1943 >        &quot;<a HREF="http://radsite.lbl.gov/mgf/compare.html">
1944          Comparing Real and Synthetic Images: Some Ideas about
1945 <        Metrics</a>,'' Sixth Eurographics Workshop on Rendering,
1945 >        Metrics</a>,&quot; Sixth Eurographics Workshop on Rendering,
1946          Springer-Verlag, Dublin, Ireland, June 1995.</li>
1947 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE
1948 <        Lighting Simulation and Rendering System</a>,'' <em>Computer
1947 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE
1948 >        Lighting Simulation and Rendering System</a>,&quot; <em>Computer
1949          Graphics</em>, July 1994.</li>
1950 <    <li>Rushmeier, H., G. Ward, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy
1951 <        Preserving Non-Linear Filters</a>,'' <em>Computer
1950 >    <li>Rushmeier, H., G. Ward, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy
1951 >        Preserving Non-Linear Filters</a>,&quot; <em>Computer
1952          Graphics</em>, July 1994.</li>
1953 <    <li>Ward, G., ``A Contrast-Based Scalefactor for Luminance
1954 <        Display,'' <em>Graphics Gems IV</em>, Edited by Paul Heckbert,
1953 >    <li>Ward, G., &quot;A Contrast-Based Scalefactor for Luminance
1954 >        Display,&quot; <em>Graphics Gems IV</em>, Edited by Paul Heckbert,
1955          Academic Press 1994.</li>
1956 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and
1957 <        Modeling Anisotropic Reflection</a>,'' <em>Computer
1956 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and
1957 >        Modeling Anisotropic Reflection</a>,&quot; <em>Computer
1958          Graphics</em>, Vol. 26, No. 2, July 1992. </li>
1959 <    <li>Ward, G., P. Heckbert, ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance
1960 <        Gradients</a>,'' Third Annual Eurographics Workshop on
1959 >    <li>Ward, G., P. Heckbert, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance
1960 >        Gradients</a>,&quot; Third Annual Eurographics Workshop on
1961          Rendering, Springer-Verlag, May 1992. </li>
1962 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow
1963 <        Testing for Ray Tracing</a>'' Photorealistic Rendering in
1962 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow
1963 >        Testing for Ray Tracing</a>&quot; Photorealistic Rendering in
1964          Computer Graphics, proceedings of 1991 Eurographics
1965          Rendering Workshop, edited by P. Brunet and F.W. Jansen,
1966          Springer-Verlag. </li>
1967 <    <li>Ward, G., ``Visualization,'' <em>Lighting Design and
1967 >    <li>Ward, G., &quot;Visualization,&quot; <em>Lighting Design and
1968          Application</em>, Vol. 20, No. 6, June 1990. </li>
1969 <    <li>Ward, G., F. Rubinstein, R. Clear, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for
1970 <        Diffuse Interreflection</a>,'' <em>Computer Graphics</em>,
1969 >    <li>Ward, G., F. Rubinstein, R. Clear, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for
1970 >        Diffuse Interreflection</a>,&quot; <em>Computer Graphics</em>,
1971          Vol. 22, No. 4, August 1988. </li>
1972 <    <li>Ward, G., F. Rubinstein, ``A New Technique for Computer
1973 <        Simulation of Illuminated Spaces,'' <em>Journal of the
1972 >    <li>Ward, G., F. Rubinstein, &quot;A New Technique for Computer
1973 >        Simulation of Illuminated Spaces,&quot; <em>Journal of the
1974          Illuminating Engineering Society</em>, Vol. 17, No. 1,
1975          Winter 1988. </li>
1976   </ul>
# Line 1925 | Line 2008 | SURFACES       MATERIALS       TEXTURES        PATTERNS        MIXTURES</h4>
2008                  <a HREF="#Plasdata">Plasdata</a>
2009                  <a HREF="#Metdata">Metdata</a>
2010                  <a HREF="#Transdata">Transdata</a>
2011 +                <a HREF="#BSDF">BSDF</a>
2012                  <a HREF="#Antimatter">Antimatter</a>
2013                                  
2014   </pre>

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