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.\" RCSid "$Id: genblinds.1,v 1.3 2004/01/01 19:31:44 greg Exp $"
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.TH GENBLINDS 1 10/10/94 RADIANCE
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.SH NAME
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genblinds - generate a RADIANCE description of venetian blinds
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.SH SYNOPSIS
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.B "genblinds mat name depth width height nslats angle"
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[
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.B "\-r|+r rcurv"
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]
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.SH DESCRIPTION
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.I Genblinds
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produces a RADIANCE scene description of a set of venetian blinds.
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The
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.I depth
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of the blinds (X dimension) is given first, followed by the
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.I width
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(Y dimension), followed by the
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.I height
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(Z dimension).
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The number of slats to place evenly within this height is given as
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.I nslats.
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The
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.I angle
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of the blind, where zero is perfectly horizontal and a
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positive angle tilts the positive X edge upwards, is
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given in degrees.
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The blinds are initially situated so that the corner of the bottom blind is
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.I "height/nslats/2"
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above the XY plane, and all coordinates are positive.
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Each new slat is placed
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.I "height/nslats"
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above the previous one, until the top slat is at
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.I "height - height/nslats/2".
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The blinds may of course be moved from this starting point with the
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.I "xform(1)"
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command.
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.PP
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If curved blinds are desired, a radius of curvature may be given
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with the
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.I "+/-r"
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option.
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If given as
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.I +r,
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The curvature is upward (which is the usual configuration).
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If the option is given as
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.I -r,
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then the curvature is downward.
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The radius indicates how far from each slat its effective
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cylindrical center resides.
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Each slat will be broken into as many polygons as is necessary to
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keep the delta changes in angle less than 10 degrees.
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(Note that this may result in a rather large number of polygons.)\0
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.SH EXAMPLE
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To produce a curved set of blinds with 15 slats:
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.IP "" .2i
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genblinds white blind 1 46 88 118 15 -r 1 > blinds.rad
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.SH AUTHOR
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Jean-Louis Scartezzini and Greg Ward
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.SH "SEE ALSO"
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genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rvu(1), xform(1)
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