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.\" RCSid $Id$ |
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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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][ |
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.B "\-b boxsize" |
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][ |
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.B "\-o output device" |
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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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. This program is merely a shell script that calls |
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.I rad(1) |
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to make an octree and view the scene interactively. |
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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 file name given is |
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an IES photometry file rather then a Radiance description of a |
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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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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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.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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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 default behaviour for |
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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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is to scale the luminaire or output from |
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.I ies2rad(1) |
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so that the largest dimension of the fitting is unity, centered at the origin. |
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This scaled representation of the original fitting is then placed inside a |
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square box 10 units in length. The \-y face of the box is left open so that |
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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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If it is desirable to keep the original luminaire in both its original size, |
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and its original location, the |
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.I "\-r roomsize" |
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option may be used to fix the room size to a certain |
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.I roomsize. |
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In this case, the size and location of the fitting is not adjusted, and |
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it is up to the user to decide on appropriate room dimensions. Note that |
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when |
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.I \-r |
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and |
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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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are combined, then the dimensions of the luminaire and intesity of its |
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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. |
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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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.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 \-r 5000 XYZ_batten.rad |
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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" |
