xenial (1) genklemsamp.1.gz

NAME

       genklemsamp - generate ray samples over surfaces using Klems BSDF basis

SYNOPSIS

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

DESCRIPTION

       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 simulation.

       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 ignored.

       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.

EXAMPLE

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

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

AUTHOR

       Greg Ward

SEE ALSO

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