| 1 |
< |
.\" RCSid "$Id" |
| 1 |
> |
.\" RCSid "$Id$" |
| 2 |
|
.\" Print using the -ms macro package |
| 3 |
< |
.DA 2/17/2011 |
| 3 |
> |
.DA 07/10/2016 |
| 4 |
|
.LP |
| 5 |
< |
.tl """Copyright \(co 2011 Regents, University of California |
| 5 |
> |
.tl """Copyright \(co 2016 Regents, University of California |
| 6 |
|
.sp 2 |
| 7 |
|
.TL |
| 8 |
|
The |
| 622 |
|
8 red green blue spec urough vrough trans tspec |
| 623 |
|
.DE |
| 624 |
|
.LP |
| 625 |
+ |
.UL Ashik2 |
| 626 |
+ |
.PP |
| 627 |
+ |
Ashik2 is the anisotropic reflectance model by Ashikhmin & Shirley. |
| 628 |
+ |
The string arguments are the same as for plastic2, but the real |
| 629 |
+ |
arguments have additional flexibility to specify the specular color. |
| 630 |
+ |
Also, rather than roughness, specular power is used, which has no |
| 631 |
+ |
physical meaning other than larger numbers are equivalent to a smoother |
| 632 |
+ |
surface. |
| 633 |
+ |
.DS |
| 634 |
+ |
mod ashik2 id |
| 635 |
+ |
4+ ux uy uz funcfile transform |
| 636 |
+ |
0 |
| 637 |
+ |
8 dred dgrn dblu sred sgrn sblu u-power v-power |
| 638 |
+ |
.DE |
| 639 |
+ |
.LP |
| 640 |
|
.UL Dielectric |
| 641 |
|
.PP |
| 642 |
|
A dielectric material is transparent, and it refracts light |
| 961 |
|
The first modifier will also be used to shade the area leaving the |
| 962 |
|
antimatter volume and entering the regular volume. |
| 963 |
|
If mod1 is void, the antimatter volume is completely invisible. |
| 964 |
< |
Antimatter does not work properly with the material type "trans", |
| 965 |
< |
and multiple antimatter surfaces should be disjoint. |
| 964 |
> |
If shading is desired at antimatter surfaces, it is important |
| 965 |
> |
that the related volumes are closed with outward-facing normals. |
| 966 |
> |
Antimatter surfaces should not intersect with other antimatter boundaries, |
| 967 |
> |
and it is unwise to use the same modifier in nested antimatter volumes. |
| 968 |
|
The viewpoint must be outside all volumes concerned for a correct |
| 969 |
|
rendering. |
| 970 |
|
.NH 3 |
| 1172 |
|
Mixtures |
| 1173 |
|
.PP |
| 1174 |
|
A mixture is a blend of one or more materials or textures and patterns. |
| 1175 |
+ |
Blended materials should not be light source types or virtual source types. |
| 1176 |
|
The basic types are given below. |
| 1177 |
|
.LP |
| 1178 |
|
.UL Mixfunc |
| 1570 |
|
.NH 1 |
| 1571 |
|
References |
| 1572 |
|
.LP |
| 1573 |
+ |
Ward, G., M. Kurt & N. Bonneel, |
| 1574 |
+ |
``Reducing Anisotropic BSDF Measurement to Common Practice,'' |
| 1575 |
+ |
.I Workshop on Material Appearance Modeling, |
| 1576 |
+ |
2014. |
| 1577 |
+ |
.LP |
| 1578 |
+ |
McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee, |
| 1579 |
+ |
``A validation of a ray-tracing tool used to generate |
| 1580 |
+ |
bi-directional scattering distribution functions for |
| 1581 |
+ |
complex fenestration systems,'' |
| 1582 |
+ |
.I "Solar Energy", |
| 1583 |
+ |
98, 404-14, November 2013. |
| 1584 |
+ |
.LP |
| 1585 |
|
Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson, |
| 1586 |
|
``Simulating the Daylight Performance of Complex Fenestration Systems |
| 1587 |
< |
Using Bidirectional Scattering Distribution Functions within Radiance'' |
| 1588 |
< |
.I "Journal of the Illuminating Engineering Soc. of North America", |
| 1587 |
> |
Using Bidirectional Scattering Distribution Functions within Radiance,'' |
| 1588 |
> |
.I "Leukos", |
| 1589 |
> |
7(4), |
| 1590 |
|
April 2011. |
| 1591 |
|
.LP |
| 1592 |
|
Cater, K., A. Chalmers, G. Ward, |
