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.\"
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.TH "LTVIEW" "1" "08/04/14" "RADIANCE" ""
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.SH "NAME"
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ltview \- view photometry of a light source
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.SH "SYNOPSIS"
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.B ltview
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[
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.B \-i
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][
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.B "\-b boxsize"
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][
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.B "\-o device"
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]
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input
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.SH "DESCRIPTION"
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.I ltview
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renders a Radiance luminiare or IES photometry interactively using
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.I rad(1).
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.PP
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.I ltview
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accepts exactly one Radiance object or IES photometry
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file as input. No input is taken from STDIN. The
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.I \-i
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option tells it that the input file contains
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IES photometry 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 into a
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Radiance object.
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.PP
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Unlike
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.I objpict(1)
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or
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.I objview(1),
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no additional light sources are added to the scene, since it is
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assumed that the object is a luminaire.
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.PP
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.I ltview
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relies on Radiance's
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.I rad(1)
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command to compile an octree using
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.I oconv(1)
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and to call
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.I rvu(1)
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to display an interactive preview of the luminaire.
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The luminaire, or output from
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.I ies2rad(1),
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is moved so that its center is at world origin.
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.I ltview
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then generates an open box around the fitting that is ten times
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as big as the largest axis\-aligned dimension of the fitting.
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The \-y face of the box is left open so that
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the camera can look inside, facing +y.
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The overall dimensions of the enclosing box may be overwritten with the
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.I "\-b boxsize"
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option. Note that both the fitting and the box are always centred at the
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origin.
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.PP
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When
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.I ltview
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is run with the
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.I \-i
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option, i.e. the file is an IES photometry file,
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then the dimensions of the luminaire and intesity of its
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output are determined by
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.I ies2rad(1)'s
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default settings. If this is not acceptable, then it is best to run
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.I ies2rad(1)
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manually, and to feed
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.I ltview
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the hand\-crafted fitting, rather than the IES photometry. In any case,
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it is likely that the initial exposure within the
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.I rvu(1)
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window window needs to be adjusted before the distribution of the fitting
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can be fully appreciated.
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.PP
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The default
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.I rvu(1)
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output device is
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.I x11
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on all platforms except for Windows, where it is set to
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.I qt.
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This may be overwritten with the
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.I "\-o output"
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option.
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.SH "EXAMPLES"
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To query available output devices
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.IP "" .2i
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rvu \-devices
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.PP
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To visualise an IES file with the qt driver
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.IP "" .2i
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ltview \-o qt ABC123.ies
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.PP
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To look at a typical fluorescent fitting that is modelled in millimeters
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.IP "" .2i
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ltview \-b 5000 XYZ_batten.rad
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.SH "AUTHOR"
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Axel Jacobs
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.SH "SEE ALSO"
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ltpict(1), ies2rad(1), oconv(1), rad(1), rvu(1)
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