[ViewVC] Diff of: radiance/ray/doc/ray.html

Comparing ray/doc/ray.html (file contents):
Revision 1.24 by greg, Sat Aug 26 16:07:22 2017 UTC vs.
Revision 1.26 by greg, Tue Jun 26 14:42:18 2018 UTC

+<p>
+<dt>
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+        <a NAME="aBSDF">
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+        <b>aBSDF</b>
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+        </a>
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+<dd>
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+        The aBSDF material is identical to the BSDF type with two
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+        important differences.  First, proxy geometry is not
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+        supported, so there is no thickness parameter.  Second, an
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+        aBSDF is assumed to have some specular through component
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+        (the &rsquo;a&rsquo; stands for &quot;aperture&quot;),
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+        which is treated specially during the direct calculation
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+        and when viewing the material.  Based on the BSDF data, the
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+        coefficient of specular transmission is determined and used
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+        for modifying unscattered shadow and view rays.
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+<pre>
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+        mod aBSDF id
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++ BSDFfile ux uy uz funcfile transform
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+|3|6|9
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+             rfdif gfdif bfdif
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+             rbdif gbdif bbdif
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+             rtdif gtdif btdif
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+</pre>
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+<p>
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+        If a material has no specular transmitted component, it is
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+        much better to use the BSDF type with a zero thickness
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+        than to use aBSDF.
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+<p>
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+<dt>
+        <a NAME="Antimatter">
+        <b>Antimatter</b>
+        </a>

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