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.TH "LTPICT" "1" "08/04/14" "RADIANCE" ""
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.SH "NAME"
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ltpict \- render a four\-view image of a light source
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.SH "SYNOPSIS"
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.B ltpict
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[
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.B \-i
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][
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.B "\-d dimensions"
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]
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input
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.SH "DESCRIPTION"
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.I ltpict
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is a script that renders a four\-view HDR image of a Radiance luminaire
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or IES photometric file. The
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.I \-i
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option tells it that the file name given is
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an IES photometry file rather then a Radiance description of a
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luminiare. In this case, Radiance's
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.I ies2rad(1)
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is called with its default settings to convert the IES file to a
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Radiance object.
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.PP
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The four projections presented are the lower hemisphere
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(displayed in the upper left quadrant), the upper hemisphere
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(upper right), the C0\-C180 plane (lower left) and the
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C90\-C270 plane (lower right).
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.PP
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Only one Radiance luminaire description or IES photometry file
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may be given. No input is accepted on STDIN.
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.PP
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The output image in HDR format is produced on STDOUT with
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the default dimensions of 1024 by 1024 pixels. The dimensions
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may be overwritten with the
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.I "\-d dimensions
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option which takes an integer that is divisible by two.
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.SH "EXAMPLES"
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To render a four\-view image of photometry file ABC123.ies
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and save the result to luminaire.hdr
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.IP "" .2i
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ltpict \-i ABC123.ies > luminaire.hdr
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.PP
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To render a small four\-view HDR image of the
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RADIANCE luminaire XYZ456.rad to STDOUT, and display it with ximage
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.IP "" .2i
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ltpict \-d 400 XYZ456.rad | ximage
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.SH "AUTHOR"
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Axel Jacobs
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.SH "SEE ALSO"
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objline(1), objview(1), objpict(1), ies2rad(1), ltview(1)
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