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greg |
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.\" RCSid $Id$ |
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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) |
