[Radiance-general] 3-phase method daylight matrix

[Eleonora Brembilla]

Thanks Greg, it does help!

It is like I thought and did at the end. And the xform line will be a nice addition to my script.

A warning message could probably be useful for newbies like me.

Cheers
Eleonora


On 12 Mar 2015, at 17:38, radiance-general-request at radiance-online.org<mailto:radiance-general-request at radiance-online.org> wrote:

From: Greg Ward <gregoryjward at gmail.com<mailto:gregoryjward at gmail.com>>
Subject: Re: [Radiance-general] 3-phase method daylight matrix
Date: 12 March 2015 15:17:00 GMT
To: Radiance general discussion <radiance-general at radiance-online.org<mailto:radiance-general at radiance-online.org>>
Reply-To: Radiance general discussion <radiance-general at radiance-online.org<mailto:radiance-general at radiance-online.org>>


Hi Eleanora,

I'm not sure I'm understanding your question fully, but you can have multiple *receivers* in the same file to generate multiple matrices using rfluxmtx.  However, if you wish to use those receivers (i.e., your window surfaces) as *senders* in a subsequent run (i.e., for the exterior daylight coefficients), then you must have them in separate files for multiple runs of rfluxmtx.

It is probably poor program design on my part, but currently, rfluxmtx ignores the materials in a sender file, and just puts them all together as a single "average" surface.  This gives unintended results if you give it two well-separated windows of different orientations, and this is possibly the source of your errors.

For optimal efficiency using rfluxmtx for 3-phase, it is better to have separate files for your different elevation windows, with different modifiers in each.  For example, you might have:

east_windows.rad (using "east_window_mat" to modify all the surfaces)
west_windows.rad (using "west_window_mat")
south_windows.rad (using "south_window_mat")

This would allow you to do the necessary 3 separate runs of rfluxmtx to compute the contribution from each elevation's windows for the external daylight coefficients.  Then, you could have a combined "receivers.rad" file that contains the following single line:

!xform east_windows.rad west_windows.rad south_windows.rad

You would give this one-line file to a single run of rfluxmtx to compute the three interior flux transform matrix for your sensors.

Does this help?

Cheers,
-Greg

P.S.  I will see if I can add a warning message for sender files with multiple modifiers, as this seems such an easy mistake to make!

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