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

[Sandi Sirikhanchai]

Thanks Greg,

I am going through Sarith’s Tutorial at the moment trying to work out what might be done incorrectly. The link you pasted only has 20 slides and doesn’t have much introduction on rfluxmtx.

Many thanks,
Sandi

From: Greg Ward<mailto:gregoryjward at gmail.com>
Sent: Wednesday, 24 January 2018 6:31 AM
To: Radiance general discussion<mailto:radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Two windows different directions Three Phase simulation

Hi Sandi,

The output of gendaymtx has 146 columns because the first column corresponds to the ground plane, and this is needed for a full calculation.  However, you need to create your daylight matrix in the right way to make use of this.  I believe this is explained in Sarith's tutorial, and also in my 2013 rfluxmtx introduction, below.  Pay special attention to slide 42:

https://www.radiance-online.org/community/workshops/2013-golden-co/Ward-RadianceImprovements.pdf

It can also help to give a -y option in your view matrix calculation, corresponding to the number of sensor points (-y 13).  I don't think it's required the way you are doing things, but rmtxop (for example) requires the number of rows and columns to be spelled out in the header.  Note that this overrides the actual line breaks in the file, making files like the output of gendaymtx a little more readable.  (8760x3 columns are a bit much for some line-based editors.)

Cheers,
-Greg



From: Sandi Sirikhanchai <Sandi.Sirikhanchai at hotmail.co.nz<mailto:Sandi.Sirikhanchai at hotmail.co.nz>>

Date: January 22, 2018 11:32:50 PM PST



Hi Greg,



I am using 5.2, I will try with “klems_full.cal” and the windows are defined as “glow”.



I will definitely give the multiplication and addition a good go myself first but thank you for letting me know.



Yes, I am going between Sarith’s tutorial and Andy’s gitbook tutorial.



Your explanation to my final questions is incredibly helpful!



In regards to the multiplication of matrices, I am just testing with one window at the moment and I have an error that says “unexpected column count in header”.

The view matrix has 13 rows and 145 columns

The daylight matrix has 145 rows and 2306 columns

The sky matrix has 146 rows and 8760 columns (but there is only 3 columns (RGB) and many many rows)

And the BTDF is in its own different format.



Should the sky matrix say 146? Or 145? My command to create a smx is: “gendaymtx albany.wea > albany.smx”.



Thank you for your help.



Kind regards,

Sandi



From: Gregory J. Ward <gregoryjward at gmail.com<mailto:gregoryjward at gmail.com>>
Sent: Tuesday, January 23, 2018 4:20:26 PM

P.S.  Forgot to answer your final question.  You can place your receiver surface slightly in front of your window -- you are right that you don't want it in the same plane as another surface with a different material.  This would definitely mess things up.  You can re-use the same inward-facing surface as used for the view matrix receiver as a sender in the rfluxmtx command, and the material type will be ignored.  Having this surface a little inside the window will include the window in the daylight matrix.  If you want its influence in the view matrix, you can put your glow/light surface just outside the window, still with its surface normal facing into the room.  This would be appropriate if you wanted to use a BTDF for an exterior shading system, for example.
_______________________________________________

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20180126/c12e36da/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 314BE6160AAE47EF88A0CA95B7131C6C.png
Type: image/png
Size: 159 bytes
Desc: 314BE6160AAE47EF88A0CA95B7131C6C.png
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20180126/c12e36da/attachment-0001.png>