| 1154 |
|
<p> |
| 1155 |
|
|
| 1156 |
|
<dt> |
| 1157 |
< |
<a NAME="sBSDF"> |
| 1158 |
< |
<b>sBSDF</b> |
| 1157 |
> |
<a NAME="aBSDF"> |
| 1158 |
> |
<b>aBSDF</b> |
| 1159 |
|
</a> |
| 1160 |
|
|
| 1161 |
|
<dd> |
| 1162 |
< |
The sBSDF material is identical to the BSDF type with two |
| 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 |
< |
sBSDF is assumed to have some specular through component, |
| 1165 |
> |
aBSDF is assumed to have some specular through component |
| 1166 |
> |
(the ’a’ stands for "aperture"), |
| 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 sBSDF id |
| 1173 |
> |
mod aBSDF id |
| 1174 |
|
5+ BSDFfile ux uy uz funcfile transform |
| 1175 |
|
0 |
| 1176 |
|
0|3|6|9 |
| 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 sBSDF. |
| 1185 |
> |
than to use aBSDF. |
| 1186 |
|
<p> |
| 1187 |
|
|
| 1188 |
|
<dt> |
