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)
