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.\" RCSid "$Id: rtpict.1,v 1.1 2018/03/20 02:40:38 greg Exp $"
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.TH RTPICT 1 3/19/2018 RADIANCE
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.SH NAME
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rtpict - generate a RADIANCE picture using rtrace
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.SH SYNOPSIS
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.B rtpict
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.B "-n nproc"
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[
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.B "rpict options"
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]
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[
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.B @file
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]
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.B octree
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.SH DESCRIPTION
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.I Rtpict
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is a script that generates a picture from the RADIANCE scene given in
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.I octree
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and sends it to the standard output, or to a file specified with the
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.I \-o
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option.
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Most options and defaults are the same as
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.I rpict(1),
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although a few switches are silently ignored.
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Options incompatible with multi-processing can generate an error.
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.PP
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The
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.I rtrace(1)
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tool is called with
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.I vwrays(1)
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to perform the actual work.
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This enables the
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.I \-n
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option for multiprocessing on platforms that support it.
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If the
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.I \-n
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option is not specified or is set to 1, then
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.I rpict
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is called directly.
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There is no benefit in setting the number of processes to anything
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greater than the number of virtual cores available on your machine.
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Also, it is very important to set the
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.I \-af
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option if an irradiance cache is being generated;
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otherwise, your speed-up will be far from linear.
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.SH EXAMPLE
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To render a scene with four processes:
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.IP "" .2i
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rtpict -n 4 -vf mypers.vf -ab 1 -af scene.amb scene.oct > scene_pers.hdr
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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getinfo(1), lookamb(1), mkpmap(1), oconv(1), pdfblur(1), pfilt(1),
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pinterp(1), pmblur(1), printf(3), ra_rgbe(1), rad(1), rpiece(1),
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rpict(1), rtrace(1), rvu(1) vwrays(1),
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