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Revision 1.23 by greg, Sun Jul 10 23:41:37 2016 UTC vs.
Revision 1.26 by greg, Tue Jun 26 14:42:18 2018 UTC

# Line 2 | Line 2
2   <!-- RCSid $Id$ -->
3   <head>
4   <title>
5 < The RADIANCE 5.1 Synthetic Imaging System
5 > The RADIANCE 5.2 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 5.2 Synthetic Imaging System
14   </h1>
15  
16   <p>
# Line 1151 | Line 1151 | unless the line integrals consider enclosed geometry.
1151          the surface will be invisible from behind.  Unlike other
1152          data-driven material types, the BSDF type is fully supported
1153          and all parts of the distribution are properly sampled.
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>

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