| 20 |
|
generates ray origins and directions to sample planar surfaces |
| 21 |
|
needed to determine incident radiances or daylight coefficients. |
| 22 |
|
This command is typically used in conjunction with |
| 23 |
< |
.I rtcontrib(1) |
| 23 |
> |
.I rcontrib(1) |
| 24 |
|
to analyze exterior daylight coefficients |
| 25 |
|
for an annual simulation. |
| 26 |
|
.PP |
| 28 |
|
which corresponds to the orientation of the surfaces, and the view up |
| 29 |
|
vector, which corresponds to the azimuth=90-degree position on the Klems |
| 30 |
|
sampling hemisphere. |
| 31 |
+ |
The view fore clipping distance is also quite useful, as it provides |
| 32 |
+ |
a means to pass through some thickness in a fenestration system before |
| 33 |
+ |
samples are sent out. |
| 34 |
+ |
Other view options such as the view type and aft |
| 35 |
+ |
clipping distance are overridden or ignored. |
| 36 |
|
.PP |
| 37 |
|
If no Radiance scene files are provided, then the specified parallel |
| 38 |
|
view defines the width, height, center, and orientation of the window |
| 55 |
|
option specifies that output rays should be generated as 32-bit IEEE binary |
| 56 |
|
float values. |
| 57 |
|
This may be more efficient if passed directly to |
| 58 |
< |
.I rtcontrib |
| 58 |
> |
.I rcontrib |
| 59 |
|
or |
| 60 |
|
.I rtrace(1) |
| 61 |
|
with the same option. |
| 68 |
|
.SH EXAMPLE |
| 69 |
|
To generate 500 samples per direction over a set of south-facing windows and |
| 70 |
|
pass to |
| 71 |
< |
.I rtcontrib |
| 71 |
> |
.I rcontrib |
| 72 |
|
to compute daylight coefficients in a matrix: |
| 73 |
|
.IP "" .2i |
| 74 |
|
genklemsamp -c 500 -vd 0 -1 0 -vu 0 0 1 south_windows.rad |
| 75 |
< |
| rtcontrib -c 500 -f tregenza.cal -b tbin -bn 146 exterior.oct > Dsouth.dat |
| 75 |
> |
| rcontrib -c 500 -e MF:1 -f reinhart.cal -b rbin -bn Nrbins exterior.oct > Dsouth.dat |
| 76 |
|
.SH AUTHOR |
| 77 |
|
Greg Ward |
| 78 |
|
.SH "SEE ALSO" |
| 79 |
< |
mkillum(1), rtcontrib(1), rtrace(1), vwrays(1) |
| 79 |
> |
dctimestep(1), genBSDF(1), genskyvec(1), mkillum(1), |
| 80 |
> |
rcontrib(1), rtrace(1), vwrays(1) |
