1 .TH "LTPICT" "1" "11/03/14" "RADIANCE" ""

     2 .SH "NAME"

     3 ltpict \- render a four\-view image of 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 into 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), at the C0\-C180 plane (lower left) and at 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 options 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)