NAME

       genblinds - generate a RADIANCE description of venetian blinds

SYNOPSIS

       genblinds mat name depth width height nslats angle [ -r|+r rcurv ]

DESCRIPTION

       Genblinds produces a RADIANCE scene description of a set of venetian blinds.  The depth of
       the blinds (X dimension) is given first, followed by the width (Y dimension), followed  by
       the height (Z dimension).  The number of slats to place evenly within this height is given
       as nslats.  The angle of the blind, where zero is  perfectly  horizontal  and  a  positive
       angle  tilts  the  positive X edge upwards, is given in degrees.  The blinds are initially
       situated so that the corner of the bottom blind is height/nslats/2 above the XY plane, and
       all  coordinates  are  positive.  Each new slat is placed height/nslats above the previous
       one, until the top slat is at height - height/nslats/2 .  The  blinds  may  of  course  be
       moved from this starting point with the xform(1) command.

       If curved blinds are desired, a radius of curvature may be given with the +/-r option.  If
       given as +r, The curvature is upward (which is the usual configuration).  If the option is
       given  as -r, then the curvature is downward.  The radius indicates how far from each slat
       its effective cylindrical center resides.  Each slat will be broken into as many  polygons
       as  is necessary to keep the delta changes in angle less than 10 degrees.  (Note that this
       may result in a rather large number of polygons.)

EXAMPLE

       To produce a curved set of blinds with 25 slats at 15 degrees:

         genblinds white blind 1 46 88 25 15 -r 1 > blinds.rad

AUTHOR

       Jean-Louis Scartezzini and Greg Ward

SEE ALSO

       genrbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rvu(1), xform(1)