| 36 |
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front reflection, back reflection, front transmission, |
| 37 |
|
and back transmission. |
| 38 |
|
Theoretically, only one transmission direction is required, |
| 39 |
< |
but it is often safest to measure both if they |
| 39 |
> |
but it is often safest to measure both if they are to |
| 40 |
|
be used in a simulation. |
| 41 |
|
(See |
| 42 |
|
.I bsdf2klems(1) |
| 252 |
|
utility, the world coordinate system follows trigonometric |
| 253 |
|
conventions with theta=0 aligning to the Z-axis, |
| 254 |
|
the X-axis matches (theta,phi)=(90,0), and the Y-axis |
| 255 |
< |
is has (theta,phi)=(90,90). |
| 255 |
> |
corresponds to (theta,phi)=(90,90). |
| 256 |
|
The latter is thought of as the "up" direction for the sample. |
| 257 |
|
This usually needs to be rotated into position, since most |
| 258 |
|
RADIANCE models use the Z-axis as the world "up" direction. |
| 260 |
|
Greg Ward |
| 261 |
|
.SH "SEE ALSO" |
| 262 |
|
bsdf2klems(1), bsdf2rad(1), bsdf2ttree(1), bsdfview(1), genBSDF(1), |
| 263 |
< |
pabopto2xyz(1) |
| 263 |
> |
pabopto2xyz(1) |
