Table of Contents
genblinds - generate a RADIANCE description of venetian
blinds
genblinds mat name depth width height nslats angle [ -r|+r
rcurv ]
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 downward (which is the usual configuration). If the
option is given as +r, then the curvature is upward. 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.)
To produce a curved set of blinds with 15 slats:
genblinds white blind 1 46 88 118 15 -r 1 > blinds.rad
Jean-Louis Scartezzini and Greg Ward
genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1),
rview(1), xform(1)
Header and Footer
GENBLINDS(1) RADIANCE (10/10/94) GENBLINDS(1)
Page 1 (printed 7/17/96)
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