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       dctimestep   -   compute   annual   simulation   time-step  via  matrix


       dctimestep Vspec Tbsdf.xml Dmat.dat [ tregvec ]


       Dctimestep takes four input files, forming a  matrix  expression.   The
       first argument is the View matrix file that specifies how window output
       directions are related to some set of measured values, such as an array
       of  illuminance  points  or images.  This matrix is usually computed by
       rtcontrib(1) for a particular set of windows or skylight openings.  The
       second  argument is the window transmission matrix, or BSDF, given as a
       standard XML description.  The third argument is  the  Daylight  matrix
       file  that  defines  how  sky patches relate to input directions on the
       same opening.  This  is  usually  computed  using  genklemsamp(1)  with
       rtcontrib  in  a  separate run for each window or skylight orientation.
       The final input is the sky contribution  vector,  usually  computed  by
       genskyvec(1),  which  may  be  passed on the standard input.  This data
       must be in ASCII format, whereas the View  and  Daylight  matrices  are
       more efficiently represented as binary float data if machine byte-order
       is not an issue.

       Sent to the standard output of dctimestep  is  either  an  ASCII  color
       vector  with as many RGB triplets as there are rows in the View matrix,
       or a combined Radiance picture.  Which output is  produced  depends  on
       the Vspec argument.  A regular file name will be loaded and interpreted
       as a matrix to generate a color results vector.  A  file  specification
       containing  a  ā€™%dā€™  format  string  will  be  interpreted as a list of
       Radiance component pictures, which will  be  summed  according  to  the
       computed vector.


       To  compute  a  set  of  illuminance  contributions for Window 1 on the
       Winter solstice at 2pm:

         gensky 12 21 14 |  genskyvec  |  dctimestep  IllPts.vmx  Blinds20.xml
         Window1.dmx > Ill_12-21-14.dat

       To compute Window2ā€™s contribution to an interior view at 12 noon on the
       Summer solstice:

         gensky 6 21 12 | genskyvec  |  dctimestep  view%03d.hdr  Blinds30.xml
         Window2.dmx > view_6-21-12.hdr


       Greg Ward


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