GENBLINDS(1)                                                      GENBLINDS(1)



NNAAMMEE
       genblinds - generate a RADIANCE description of venetian blinds

SSYYNNOOPPSSIISS
       ggeennbblliinnddss mmaatt nnaammee ddeepptthh wwiiddtthh hheeiigghhtt nnssllaattss aannggllee [ --rr||++rr rrccuurrvv ]

DDEESSCCRRIIPPTTIIOONN
       _G_e_n_b_l_i_n_d_s  produces  a  RADIANCE scene description of a set of venetian
       blinds.  The _d_e_p_t_h of the blinds (X dimension) is given first, followed
       by  the _w_i_d_t_h (Y dimension), followed by the _h_e_i_g_h_t (Z dimension).  The
       number of slats to place evenly within this height is given as  _n_s_l_a_t_s_.
       The  _a_n_g_l_e 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
       _h_e_i_g_h_t_/_n_s_l_a_t_s_/_2 above the XY plane, and all coordinates  are  positive.
       Each new slat is placed _h_e_i_g_h_t_/_n_s_l_a_t_s above the previous one, until the
       top slat is at _h_e_i_g_h_t _- _h_e_i_g_h_t_/_n_s_l_a_t_s_/_2 _.  The blinds may of course  be
       moved from this starting point with the _x_f_o_r_m_(_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.)

EEXXAAMMPPLLEE
       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

AAUUTTHHOORR
       Jean-Louis Scartezzini and Greg Ward

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



RADIANCE                           10/10/94                       GENBLINDS(1)
