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genblinds - generate a RADIANCE description of venetian blinds

genblindsmatnamedepthwidthheightnslatsangle[-r|+rrcurv]

Genblindsproduces a RADIANCE scene description of a set of venetian blinds. Thedepthof the blinds (X dimension) is given first, followed by thewidth(Y dimension), followed by theheight(Z dimension). The number of slats to place evenly within this height is given asnslats.Theangleof 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 isheight/nslats/2above the XY plane, and all coordinates are positive. Each new slat is placedheight/nslatsabove the previous one, until the top slat is atheight-height/nslats/2.The blinds may of course be moved from this starting point with thexform(1)command. If curved blinds are desired, a radius of curvature may be given with the+/-roption. 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.)

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

Jean-Louis Scartezzini and Greg Ward

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