| 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> |
| 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> |
| 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="sBSDF"> |
| 1158 |
+ |
<b>sBSDF</b> |
| 1159 |
+ |
</a> |
| 1160 |
+ |
|
| 1161 |
+ |
<dd> |
| 1162 |
+ |
The sBSDF 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 |
+ |
sBSDF is assumed to have some specular through component, |
| 1166 |
+ |
which is treated specially during the direct calculation |
| 1167 |
+ |
and when viewing the material. Based on the BSDF data, the |
| 1168 |
+ |
coefficient of specular transmission is determined and used |
| 1169 |
+ |
for modifying unscattered shadow and view rays. |
| 1170 |
+ |
|
| 1171 |
+ |
<pre> |
| 1172 |
+ |
mod sBSDF id |
| 1173 |
+ |
5+ BSDFfile ux uy uz funcfile transform |
| 1174 |
+ |
0 |
| 1175 |
+ |
0|3|6|9 |
| 1176 |
+ |
rfdif gfdif bfdif |
| 1177 |
+ |
rbdif gbdif bbdif |
| 1178 |
+ |
rtdif gtdif btdif |
| 1179 |
+ |
</pre> |
| 1180 |
+ |
|
| 1181 |
+ |
<p> |
| 1182 |
+ |
If a material has no specular transmitted component, it is |
| 1183 |
+ |
much better to use the BSDF type with a zero thickness |
| 1184 |
+ |
than to use sBSDF. |
| 1185 |
|
<p> |
| 1186 |
|
|
| 1187 |
|
<dt> |
