Radiance genblinds program

GENBLINDS(1)                                                      GENBLINDS(1)

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 posi-
       tive 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

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

RADIANCE                           10/10/94                       GENBLINDS(1)