| 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> |
| 1188 |
|
<a NAME="Antimatter"> |
| 1189 |
|
<b>Antimatter</b> |
| 1190 |
|
</a> |
