.TH "LTPICT" "1" "08/04/14" "RADIANCE" ""

.SH "NAME"

ltpict \- render a four\-view image of a light source

.SH "SYNOPSIS"

.B ltpict

[

.B \-i

][

.B "\-d dimensions"

]

input

.SH "DESCRIPTION"

.I ltpict

is a script that renders a four\-view HDR image of a Radiance luminaire

or IES photometric file.  The

.I \-i

option tells it that the file name given is 

an IES photometry file rather then a Radiance description of a 

luminiare.  In this case, Radiance's

.I ies2rad(1)

is called with its default settings to convert the IES file to a 

Radiance object.

.PP 

The four projections presented are the lower hemisphere

(displayed in the upper left quadrant), the upper hemisphere

(upper right), the C0\-C180 plane (lower left) and the

C90\-C270 plane (lower right).

.PP 

Only one Radiance luminaire description or IES photometry file

may be given.  No input is accepted on STDIN.

.PP 

The output image in HDR format is produced on STDOUT with

the default dimensions of 1024 by 1024 pixels.  The dimensions

may be overwritten with the 

.I "\-d dimensions

option which takes an integer that is divisible by two.

.SH "EXAMPLES"

To render a four\-view image of photometry file ABC123.ies

and save the result to luminaire.hdr

.IP "" .2i

ltpict \-i ABC123.ies > luminaire.hdr

.PP 

To render a small four\-view HDR image of the 

RADIANCE luminaire XYZ456.rad to STDOUT, and display it with ximage

.IP "" .2i

ltpict \-d 400 XYZ456.rad | ximage

.SH "AUTHOR"

Axel Jacobs

.SH "SEE ALSO"

objline(1), objview(1), objpict(1), ies2rad(1), ltview(1)