| 1 |
.TH "LTPICT" "1" "08/04/14" "RADIANCE" "" |
| 2 |
.SH "NAME" |
| 3 |
ltpict \- render a four\-view image of a light source |
| 4 |
.SH "SYNOPSIS" |
| 5 |
.B ltpict |
| 6 |
[ |
| 7 |
.B \-i |
| 8 |
][ |
| 9 |
.B "\-d dimensions" |
| 10 |
] |
| 11 |
input |
| 12 |
.SH "DESCRIPTION" |
| 13 |
.I ltpict |
| 14 |
is a script that renders a four\-view HDR image of a Radiance luminaire |
| 15 |
or IES photometric file. The |
| 16 |
.I \-i |
| 17 |
option tells it that the file name given is |
| 18 |
an IES photometry file rather then a Radiance description of a |
| 19 |
luminiare. In this case, Radiance's |
| 20 |
.I ies2rad(1) |
| 21 |
is called with its default settings to convert the IES file to a |
| 22 |
Radiance object. |
| 23 |
.PP |
| 24 |
The four projections presented are the lower hemisphere |
| 25 |
(displayed in the upper left quadrant), the upper hemisphere |
| 26 |
(upper right), the C0\-C180 plane (lower left) and the |
| 27 |
C90\-C270 plane (lower right). |
| 28 |
.PP |
| 29 |
Only one Radiance luminaire description or IES photometry file |
| 30 |
may be given. No input is accepted on STDIN. |
| 31 |
.PP |
| 32 |
The output image in HDR format is produced on STDOUT with |
| 33 |
the default dimensions of 1024 by 1024 pixels. The dimensions |
| 34 |
may be overwritten with the |
| 35 |
.I "\-d dimensions |
| 36 |
option which takes an integer that is divisible by two. |
| 37 |
.SH "EXAMPLES" |
| 38 |
To render a four\-view image of photometry file ABC123.ies |
| 39 |
and save the result to luminaire.hdr |
| 40 |
.IP "" .2i |
| 41 |
ltpict \-i ABC123.ies > luminaire.hdr |
| 42 |
.PP |
| 43 |
To render a small four\-view HDR image of the |
| 44 |
RADIANCE luminaire XYZ456.rad to STDOUT, and display it with ximage |
| 45 |
.IP "" .2i |
| 46 |
ltpict \-d 400 XYZ456.rad | ximage |
| 47 |
.SH "AUTHOR" |
| 48 |
Axel Jacobs |
| 49 |
.SH "SEE ALSO" |
| 50 |
objline(1), objview(1), objpict(1), ies2rad(1), ltview(1) |
