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.\" RCSid "$Id: vwright.1,v 1.8 2009/06/14 00:33:15 greg Exp $"
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.TH VWRIGHT 1 8/29/96 RADIANCE
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.SH NAME
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vwright - normalize a RADIANCE view, shift it to the right
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.SH SYNOPSIS
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.B vwright
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.B "[ view options ]"
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.B distance
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.br
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.B vwright
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.B "[ view options ]"
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.B name
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.SH DESCRIPTION
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In the first form,
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.I vwright
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shifts a RADIANCE view
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the specified distance to the right, putting out a complete set of
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view parameters in a single line on the standard output.
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This utility is most often used to compute a right-eyed view from
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a left-eye view for stereo imaging.
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.PP
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If no options are specified on the command line,
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.I vwright
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reads a view from its standard input.
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.PP
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The
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.I distance
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given is in world coordinate units.
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A negative value indicates a shift to the left rather than the
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right.
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.PP
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The second form substitutes a name prefix in place of the shift
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distance, and produces constant assignments on the standard output
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suitable for passing directly to
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.I rcalc(1).
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For a given prefix
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.I N,
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the constant names are as follows:
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.sp
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.nf
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Nt: view type ('v'==1,'l'==2,'a'==3,'h'==4,'c'==5,'s'==6)
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Npx: view point x value
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Npy: view point y value
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Npz: view point z value
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Ndx: view direction x value (normalized)
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Ndy: view direction y value (normalized)
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Ndz: view direction z value (normalized)
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Nd: view focal distance
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Nux: view up vector x value (normalized)
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Nuy: view up vector y value (normalized)
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Nuz: view up vector z value (normalized)
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Nh: view horizontal size
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Nv: view vertical size
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Ns: view shift
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Nl: view lift
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No: view fore clipping distance
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Na: view aft clipping distance
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Nhx: derived horizontal image vector x value (normalized)
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Nhy: derived horizontal image vector y value (normalized)
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Nhz: derived horizontal image vector z value (normalized)
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Nhn: derived horizontal image vector multiplier
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Nvx: derived vertical image vector x value (normalized)
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Nvy: derived vertical image vector y value (normalized)
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Nvz: derived vertical image vector z value (normalized)
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Nvn: derived vertical image vector multiplier
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.fi
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.SH EXAMPLES
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To start
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.I rpict(1)
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on a view .06 meters left of the view in the file "right.vf":
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.IP "" .2i
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rpict `vwright -.06 < right.vf` scene.oct > right.hdr &
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.PP
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To move the
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.I rad(1)
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view named "left" 2.5 inches to the right
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and render from there:
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.IP "" .2i
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rad \-v "right `rad \-n \-s \-V \-v left examp.rif | vwright 2.5`" examp.rif &
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.PP
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To pass a view to
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.I rcalc
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for conversion to some other view:
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.IP "" .2i
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rcalc \-n \-e `vwright orig < orig.vf` \-f viewmod.cal \-o view.fmt > new.vf
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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pdfblur(1), rad(1), rcalc(1), rpict(1), rvu(1)
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