[Radiance-general] Two windows different directions Three Phase simulation

[Greg Ward]

Hi Sandi,

I'm not spotting anything obvious wrong with your Radiance commands.  I would also expect your first rcontrib command to generate two view matrix files.  The "klems_int.cal" file has been superseded in recent years by "klems_full.cal", which should have the same functionality in this application.  Which version of Radiance are you using? (I.e., what does "rcontrib -version" say?)    If you are not on 5.1, you might download the latest installer from NREL.

Are your window surface normals both facing into the room, and are windowsouth and windownorth defined as "glow" or "light" materials?

To combine the north and south window contributions, you want to run dctimestep on each, combining your sky matrix or vector with the appropriate BTDF per window to obtain the partial irradiance values at your sensor points.  These may then be added together and converted to illuminance using rmtxop.  If you are having trouble with this part, send the list of commands and file names you have working, and we can put together the final bits.

Are you working from Sarith's tutorial <https://www.radiance-online.org/learning/tutorials/matrix-based-methods> ?  This is the most comprehensive directions we have available.

Best,
-Greg

> From: Sandi Sirikhanchai <sandi.sirikhanchai at hotmail.co.nz>
> Date: January 22, 2018 3:14:41 PM PST
> 
> Hello everyone,
>  
> I am working through re-simulating existing radiance models that were created in another programme and wanted to check if I am using the right method.
>  
> The files that I have received are 1 radiance model, 2 material files, and a range of bsdf files. (There are no window glow files for creating a view matrix or sky.rad files). The model has two windows, one faces north and one south and having these two windows is tripping me up a bit.
>  
> So overall, I have to create one sky matrix, two view matrices and two daylight matrices? Is this correct?
>  
> To make the view matrix I am using the command:
> rcontrib -f klems_int.cal -bn Nkbins -fo -o results\photocells_%s.vmx -b kbinS -m windowsouth -b kbinN -m windownorth -I+ -ab 12 -ad 5000 -lw 2e-5 model2windows.oct < points.pts
>  
> in which %s should generate two files, but when I run it only generates one. Because of this I ran the command twice – one for the north window and one for the south window.
>  
> To make the daylight matrix for each window I used two commands to make each matrix:   
> rfluxmtx north.rad sky.rad material_detailed.rad materialsAliasesDetailed.rad radmodel.rad > north_dmx.dmx
>  
> rfluxmtx south.rad sky.rad material_detailed.rad materialsAliasesDetailed.rad radmodel.rad > south_dmx.dmx
>  
> Then I combine the matrices for the north window together and then south window together and then add together?
>  
> I would also like to know whether the window glow that needs to be inwards facing to create a view matrix can be in the same plane as the windows in the radiance model or if I can have it a couple millimetres in front of the radiance model window. It will mean I have two material directly on each other.
>  
> Any clarifications/comments would be very much appreciated.
>  
> Many thanks,
> Sandi
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