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# Line 1063 | Line 1063 | unless the line integrals consider enclosed geometry.
1063          Real arguments to this material may define additional
1064          diffuse components that augment the BSDF data.
1065          String arguments are used to define thickness for proxied
1066 <        surfaces and the "up" orientation for the material.
1066 >        surfaces and the &quot;up&quot; orientation for the material.
1067  
1068   <pre>
1069          mod BSDF id
# Line 1076 | Line 1076 | unless the line integrals consider enclosed geometry.
1076   </pre>
1077  
1078   <p>
1079 <        The first string argument is a "thickness" parameter that may be used
1079 >        The first string argument is a &quot;thickness&quot; parameter that may be used
1080          to hide detail geometry being proxied by an aggregate BSDF material.
1081          If a view or shadow ray hits a BSDF proxy with non-zero thickness,
1082          it will pass directly through as if the surface were not there.
# Line 1092 | Line 1092 | unless the line integrals consider enclosed geometry.
1092          a parallel BSDF surface may be
1093          placed slightly less than the given thickness away from the front surface
1094          to enclose the complex geometry on both sides.
1095 +        The sign of the thickness is important, as it indicates
1096 +        whether the proxied geometry is behind the BSDF
1097 +        surface (when thickness is positive) or in front (when
1098 +        thickness is negative).
1099   <p>
1100 <        The second string argument is the name of the BSDF file, which is
1101 <        found in the usual auxiliary locations.
1102 <        The following three string parameters name variables for an "up" vector,
1103 <        which together with the surface normal, define the
1104 <        local coordinate system that orients the BSDF.
1105 <        These variables, along with the thickness, are defined in a function
1106 <        file given as the next string argument.
1107 <        An optional transform is used to scale the thickness and reorient the up vector.
1100 >        The second string argument is the name of the BSDF file,
1101 >        which is found in the usual auxiliary locations.  The
1102 >        following three string parameters name variables for an
1103 >        &quot;up&quot; vector, which together with the surface
1104 >        normal, define the local coordinate system that orients the
1105 >        BSDF.  These variables, along with the thickness, are defined
1106 >        in a function file given as the next string argument.  An
1107 >        optional transform is used to scale the thickness and
1108 >        reorient the up vector.
1109   <p>
1110 <        If no real arguments are given, the BSDF is used by itself to determine
1111 <        reflection and transmission.
1112 <        If there are at least 3 real arguments, the first triplet is an
1113 <        additional diffuse reflectance for the front side.
1114 <        At least 6 real arguments adds diffuse reflectance to the rear side of the surface.
1115 <        If there are 9 real arguments, the final triplet will be taken as an additional
1116 <        diffuse transmittance.
1117 <        All diffuse components as well as the non-diffuse transmission are
1118 <        modified by patterns applied to this material.
1119 <        The non-diffuse reflection from either side are unaffected.
1120 <        Textures perturb the effective surface normal in the usual way.
1110 >        If no real arguments are given, the BSDF is used by itself
1111 >        to determine reflection and transmission.  If there are at
1112 >        least 3 real arguments, the first triplet is an additional
1113 >        diffuse reflectance for the front side.  At least 6 real
1114 >        arguments adds diffuse reflectance to the rear side of the
1115 >        surface.  If there are 9 real arguments, the final triplet
1116 >        will be taken as an additional diffuse transmittance.  All
1117 >        diffuse components as well as the non-diffuse transmission
1118 >        are modified by patterns applied to this material.  The
1119 >        non-diffuse reflection from either side are unaffected.
1120 >        Textures perturb the effective surface normal in the usual
1121 >        way.
1122   <p>
1123 <        The surface normal of this type is not altered to face the incoming ray,
1124 <        so the front and back BSDF reflections may differ.
1125 <        (Transmission is identical front-to-back by physical law.)\0
1126 <        If back visibility is turned off during rendering and there is no
1127 <        transmission or back-side reflection, only then the surface will be
1128 <        invisible from behind.
1129 <        Unlike other data-driven material types, the BSDF type is fully
1130 <        supported and all parts of the distribution are properly sampled.
1123 >        The surface normal of this type is not altered to face the
1124 >        incoming ray, so the front and back BSDF reflections may
1125 >        differ.  (Transmission is identical front-to-back by physical
1126 >        law.) If back visibility is turned off during rendering and
1127 >        there is no transmission or back-side reflection, only then
1128 >        the surface will be invisible from behind.  Unlike other
1129 >        data-driven material types, the BSDF type is fully supported
1130 >        and all parts of the distribution are properly sampled.
1131   <p>
1132  
1133   <dt>
# Line 1851 | Line 1857 | are met:
1857        nor may &quot;Radiance&quot; appear in their name, without prior written
1858        permission of Lawrence Berkeley National Laboratory.
1859  
1860 < THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
1860 > THIS SOFTWARE IS PROVIDED ``AS IS&quot; AND ANY EXPRESSED OR IMPLIED
1861   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1862   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1863   DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
# Line 1890 | Line 1896 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1896   </h2>
1897   <p>
1898   <ul>
1899 +    <li>Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson,
1900 +        &quot;Simulating the Daylight Performance of Complex Fenestration Systems
1901 +        Using Bidirectional Scattering Distribution Functions within Radiance&quot;
1902 +        <em>Journal of the Illuminating Engineering Soc. of North America</em>,
1903 +        April 2011.
1904      <li>Cater, Kirsten, Alan Chalmers, Greg Ward,
1905          &quot;<a href="http://www.anyhere.com/gward/papers/egsr2003.pdf">Detail to Attention:
1906          Exploiting Visual Tasks for Selective Rendering</a>,&quot;
1907          <em>Eurographics Symposium
1908          on Rendering 2003</em>, June 2003.
1909      <li>Ward, Greg, Elena Eydelberg-Vileshin,
1910 <        ``<a HREF="http://www.anyhere.com/gward/papers/egwr02/index.html">Picture Perfect RGB
1911 <        Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>,''
1910 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/egwr02/index.html">Picture Perfect RGB
1911 >        Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>,&quot;
1912          Thirteenth Eurographics Workshop on Rendering (2002),
1913          P. Debevec and S. Gibson (Editors), June 2002.
1914      <li>Ward, Gregory,
1915 <        ``<a HREF="http://www.anyhere.com/gward/papers/cic01.pdf">High Dynamic Range Imaging</a>,''
1915 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/cic01.pdf">High Dynamic Range Imaging</a>,&quot;
1916          Proceedings of the Ninth Color Imaging Conference, November 2001.
1917      <li>Ward, Gregory and Maryann Simmons,
1918 <        ``<a HREF="http://www.anyhere.com/gward/papers/tog99.pdf">
1918 >        &quot;<a HREF="http://www.anyhere.com/gward/papers/tog99.pdf">
1919          The Holodeck Ray Cache: An Interactive Rendering System for Global Illumination in Nondiffuse
1920 <        Environments</a>,'' ACM Transactions on Graphics, 18(4):361-98, October 1999.
1921 <    <li>Larson, G.W., ``<a HREF="http://www.anyhere.com/gward/papers/ewp98.pdf">The Holodeck: A Parallel
1922 <        Ray-caching Rendering System</a>,'' Proceedings of the Second
1920 >        Environments</a>,&quot; ACM Transactions on Graphics, 18(4):361-98, October 1999.
1921 >    <li>Larson, G.W., &quot;<a HREF="http://www.anyhere.com/gward/papers/ewp98.pdf">The Holodeck: A Parallel
1922 >        Ray-caching Rendering System</a>,&quot; Proceedings of the Second
1923          Eurographics Workshop on Parallel Graphics and Visualisation,
1924          September 1998.
1925      <li>Larson, G.W. and R.A. Shakespeare,
# Line 1916 | Line 1927 | Ecole  Polytechnique  Federale de Lausanne (EPFL Unive
1927          the Art and Science of Lighting Visualization</em></a>,
1928          Morgan Kaufmann Publishers, 1998.
1929      <li>Larson, G.W., H. Rushmeier, C. Piatko,
1930 <        ``<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility
1930 >        &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility
1931          Matching Tone Reproduction Operator for
1932 <        High Dynamic Range Scenes</a>,'' LBNL Technical Report 39882,
1932 >        High Dynamic Range Scenes</a>,&quot; LBNL Technical Report 39882,
1933          January 1997.
1934 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making
1935 <        Global Illumination User-Friendly</a>,'' Sixth
1934 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making
1935 >        Global Illumination User-Friendly</a>,&quot; Sixth
1936          Eurographics Workshop on Rendering, Springer-Verlag,
1937          Dublin, Ireland, June 1995.</li>
1938      <li>Rushmeier, H., G. Ward, C. Piatko, P. Sanders, B. Rust,
1939 <        ``<a HREF="http://radsite.lbl.gov/mgf/compare.html">
1939 >        &quot;<a HREF="http://radsite.lbl.gov/mgf/compare.html">
1940          Comparing Real and Synthetic Images: Some Ideas about
1941 <        Metrics</a>,'' Sixth Eurographics Workshop on Rendering,
1941 >        Metrics</a>,&quot; Sixth Eurographics Workshop on Rendering,
1942          Springer-Verlag, Dublin, Ireland, June 1995.</li>
1943 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE
1944 <        Lighting Simulation and Rendering System</a>,'' <em>Computer
1943 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE
1944 >        Lighting Simulation and Rendering System</a>,&quot; <em>Computer
1945          Graphics</em>, July 1994.</li>
1946 <    <li>Rushmeier, H., G. Ward, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy
1947 <        Preserving Non-Linear Filters</a>,'' <em>Computer
1946 >    <li>Rushmeier, H., G. Ward, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy
1947 >        Preserving Non-Linear Filters</a>,&quot; <em>Computer
1948          Graphics</em>, July 1994.</li>
1949 <    <li>Ward, G., ``A Contrast-Based Scalefactor for Luminance
1950 <        Display,'' <em>Graphics Gems IV</em>, Edited by Paul Heckbert,
1949 >    <li>Ward, G., &quot;A Contrast-Based Scalefactor for Luminance
1950 >        Display,&quot; <em>Graphics Gems IV</em>, Edited by Paul Heckbert,
1951          Academic Press 1994.</li>
1952 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and
1953 <        Modeling Anisotropic Reflection</a>,'' <em>Computer
1952 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and
1953 >        Modeling Anisotropic Reflection</a>,&quot; <em>Computer
1954          Graphics</em>, Vol. 26, No. 2, July 1992. </li>
1955 <    <li>Ward, G., P. Heckbert, ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance
1956 <        Gradients</a>,'' Third Annual Eurographics Workshop on
1955 >    <li>Ward, G., P. Heckbert, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance
1956 >        Gradients</a>,&quot; Third Annual Eurographics Workshop on
1957          Rendering, Springer-Verlag, May 1992. </li>
1958 <    <li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow
1959 <        Testing for Ray Tracing</a>'' Photorealistic Rendering in
1958 >    <li>Ward, G., &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow
1959 >        Testing for Ray Tracing</a>&quot; Photorealistic Rendering in
1960          Computer Graphics, proceedings of 1991 Eurographics
1961          Rendering Workshop, edited by P. Brunet and F.W. Jansen,
1962          Springer-Verlag. </li>
1963 <    <li>Ward, G., ``Visualization,'' <em>Lighting Design and
1963 >    <li>Ward, G., &quot;Visualization,&quot; <em>Lighting Design and
1964          Application</em>, Vol. 20, No. 6, June 1990. </li>
1965 <    <li>Ward, G., F. Rubinstein, R. Clear, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for
1966 <        Diffuse Interreflection</a>,'' <em>Computer Graphics</em>,
1965 >    <li>Ward, G., F. Rubinstein, R. Clear, &quot;<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for
1966 >        Diffuse Interreflection</a>,&quot; <em>Computer Graphics</em>,
1967          Vol. 22, No. 4, August 1988. </li>
1968 <    <li>Ward, G., F. Rubinstein, ``A New Technique for Computer
1969 <        Simulation of Illuminated Spaces,'' <em>Journal of the
1968 >    <li>Ward, G., F. Rubinstein, &quot;A New Technique for Computer
1969 >        Simulation of Illuminated Spaces,&quot; <em>Journal of the
1970          Illuminating Engineering Society</em>, Vol. 17, No. 1,
1971          Winter 1988. </li>
1972   </ul>

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