| 10 |
|
.B "\-n nproc" |
| 11 |
|
][ |
| 12 |
|
.B "\-s symmetry" |
| 13 |
+ |
][ |
| 14 |
+ |
.B "\-g angle | 'A'" |
| 15 |
|
] |
| 16 |
|
.B "meas1 meas2 .." |
| 17 |
|
.SH DESCRIPTION |
| 18 |
|
.I Pabopto2bsdf |
| 19 |
|
takes two or more pab-opto |
| 20 |
|
.I Mountain |
| 21 |
< |
files, each corresponding |
| 22 |
< |
to a different incident beam angle, and produces a |
| 23 |
< |
Scattering Interpolant Representation (SIR) |
| 21 |
> |
files, each nominally containing |
| 22 |
> |
different incident beam angles or sampling patterns, |
| 23 |
> |
and produces a Scattering Interpolant Representation (SIR) |
| 24 |
|
on the standard output for further processing. |
| 25 |
|
The binary SIR contains a Radial Basis Function fitting |
| 26 |
|
each incident BSDF data file |
| 27 |
< |
and a "transport plan" between neighboring RBF |
| 27 |
> |
and a "transport plan" matrix for each pair of neighboring RBF |
| 28 |
|
directions in a spherical Delaunay mesh. |
| 29 |
|
.PP |
| 30 |
|
The SIR provides a complete 4-dimensional |
| 98 |
|
.I \-s |
| 99 |
|
option must be specified if the default mirroring is not appropriate. |
| 100 |
|
.PP |
| 101 |
+ |
If a |
| 102 |
+ |
.I \-g |
| 103 |
+ |
option is present, it will cull scattered measurements that are nearer |
| 104 |
+ |
to grazing than the given angle in degrees. |
| 105 |
+ |
If the word "auto" (which can be abbreviated as 'a' or 'A') is given |
| 106 |
+ |
instead of an angle, then the near-grazing angle will be determined |
| 107 |
+ |
by the lowest incident angle measurement present in the input data. |
| 108 |
+ |
This is sometimes necessary to eliminate noise and edge effects that |
| 109 |
+ |
some measurements exhibit near grazing. |
| 110 |
+ |
.PP |
| 111 |
|
The |
| 112 |
|
.I Mountain |
| 113 |
|
software operates the pg2 goniophotometer to |
| 122 |
|
.TP |
| 123 |
|
.BR #sample_name |
| 124 |
|
A double-quoted string containing the name associated with this sample. |
| 125 |
< |
If input files contain different sample names, the one read |
| 126 |
< |
will be the sample name passed to the SIR output. |
| 125 |
> |
If input files contain different sample names, the final sample name read |
| 126 |
> |
will be the one passed to the SIR output. |
| 127 |
|
.TP |
| 128 |
|
.BR #format: |
| 129 |
|
The data format, typically one of "theta phi DSF" or "theta phi BSDF". |
| 264 |
|
utility, the world coordinate system follows trigonometric |
| 265 |
|
conventions with theta=0 aligning to the Z-axis, |
| 266 |
|
the X-axis matches (theta,phi)=(90,0), and the Y-axis |
| 267 |
< |
is has (theta,phi)=(90,90). |
| 267 |
> |
corresponds to (theta,phi)=(90,90). |
| 268 |
|
The latter is thought of as the "up" direction for the sample. |
| 269 |
|
This usually needs to be rotated into position, since most |
| 270 |
|
RADIANCE models use the Z-axis as the world "up" direction. |
