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       genklemsamp - generate ray samples over surfaces using Klems BSDF basis


       genklemsamp [ -c N ][ -f{a|f|d} ] [ view opts ] [ geom.rad ..  ]


       Genklemsamp generates ray  origins  and  directions  to  sample  planar
       surfaces   needed   to   determine   incident   radiances  or  daylight
       coefficients.  This command  is  typically  used  in  conjunction  with
       rtcontrib(1)  to  analyze  exterior daylight coefficients for an annual

       The view options are needed to specify (at minimum) the view direction,
       which  corresponds  to the orientation of the surfaces, and the view up
       vector, which corresponds to  the  azimuth=90-degree  position  on  the
       Klems  sampling  hemisphere.   The  view fore clipping distance is also
       quite useful, as it provides a means to pass through some thickness  in
       a  fenestration system before samples are sent out.  Other view options
       such as the view type and  aft  clipping  distance  are  overridden  or

       If  no  Radiance  scene files are provided, then the specified parallel
       view defines the width, height, center, and orientation of  the  window
       or  facade of interest.  If one or more scene files are given, they are
       presumed  to  contain  planar  surfaces  over  which  genklemsamp  will
       originate  samples.  The sampled surface normals must correspond to the
       specified view direction, and unaligned surfaces are silently  ignored.

       The  -c  option  specifies  the  number  of  rays  to  sample per Klems
       direction.   These  samples  will  be  distributed  evenly   over   the
       surface(s).  The default setting is 1000.

       The -ff option specifies that output rays should be generated as 32-bit
       IEEE binary float  values.   This  may  be  more  efficient  if  passed
       directly to rtcontrib or rtrace(1) with the same option.  Likewise, the
       -fd option specifies 64-bit IEEE binary  double  values.   The  default
       setting of -fa produces ASCII floating point values.


       To  generate  500  samples  per  direction  over  a set of south-facing
       windows and pass to rtcontrib to compute  daylight  coefficients  in  a

         genklemsamp -c 500 -vd 0 -1 0 -vu 0 0 1 south_windows.rad | rtcontrib
         -c 500 -e MF:1 -f -b  rbin  -bn  Nrbins  exterior.oct  >


       Greg Ward


       dctimestep(1),   genskyvec(1),   mkillum(1),  rtcontrib(1),  rtrace(1),