[Radiance-general] Radiance 5.0 installation on ubuntu 14.04

[Humberto Antunes]

Thanks Greg, that definitely helped.

So we really need to be careful about the surface normal, if the objective
is to get illuminance values on the work plane inside a room the normal of
the window should face the interior, is that it?

There is just something i cant't understand, defining the up-direction, in
the windows located in vertical surfaces the up-direction is allways "u=Z"
no matter the orientation of the window, while in the ground or sky surface
in the daylight matrix receiver file up-direction is "u=Y", right?

It may be import to say that my model is a simple office room with only a
window, a lot like Axel's model on the rcontrib lesson, and i will have to
analyse the illuminance at the work plane for the four different
orientations of the window with different control parameters for the
shading device applied to that same window.

Best regards
Humberto A.


2016-03-18 23:50 GMT+00:00 Greg Ward <gregoryjward at gmail.com>:

> Oh, but I did neglect to mention a critical point, which is that rfluxmtx
> figures out the hemisphere orientation(s) from the surface or surfaces you
> specify in your source and receiver files.  So, it's very important that
> surface normals are directed in a certain way -- specifically, receiver
> normals point in the direction of the sampled hemisphere, and source
> normals point *away* from the hemisphere we want to sample.
>
> Though this may seem counter-intuitive, it follows naturally from the
> typical orientation of windows in Radiance, whose normals face the
> interior.  When the windows are acting as the receivers in a matrix
> calculation, such as for a view or illuminance value matrix, their normal
> is looking towards the interior hemisphere being sampled.  When their role
> changes to make them the source surfaces, as when you calculate the
> exterior daylight matrix, they are still facing the correct direction to
> have their opposite-side hemisphere send out samples to the exterior.
>
> In this way, rfluxmtx allows you to re-use your receiver description in
> one run as the source description in another run.
>
> I'm hoping this makes sense, because I mention it in the man page, but
> it's not quite obvious and I did it the wrong way around the last time I
> used the tools, myself(!)
>
> Best,
> -Greg
>
> rfluxmtx.pdf
> <http://www.radiance-online.org/learning/documentation/manual-pages/pdfs/rfluxmtx.pdf/at_download/file>
>
> *From: *"Gregory J. Ward" <gregoryjward at gmail.com>
>
> *Subject: *Re: [Radiance-general] Radiance 5.0 installation on ubuntu
> 14.04
>
> *Date: *March 18, 2016 4:40:09 PM PDT
>
>
> Hi Humberto,
>
> The rfluxmtx command takes over for genklemsamp and calls rcontrib with
> the options needed for correct operation.  You don't need to specify the
> bin or the .cal file(s), as rfluxmtx takes care of that part.  You do need
> to set both the "u=Z" (or whatever) up-direction and the desired
> hemispherical sampling type (e.g., "h=r4") in your Radiance scene
> description handed to rfluxmtx as the source or receiver(s).
>
> The reinhartb.cal file is more general than the original reinhart.cal
> file, and uses slightly different mechanisms (hence the need for a new
> name).
>
> I hope this helps, and thanks to everyone for pitching in.  I realize that
> the changes made post-tutorial have caused a good deal of confusion, but we
> hope to get it all sorted out in the end.
>
> Cheers,
> -Greg
>
> *From: *Humberto Antunes <hs.antunes at campus.fct.unl.pt>
>
> *Subject: *Re: [Radiance-general] Radiance 5.0 installation on ubuntu
> 14.04
>
> *Date: *March 18, 2016 2:49:55 PM PDT
>
>
> Hello again everybody,
>
> I have a question related to the command rfluxmtx.
> While using rcontrib to generate the view matrix we had to set the window
> orientation with the command -b kbinS or (N,E or W), how do we do that in
> the rfluxmtx? Is it set by the "u" variable or it is not needed to do this
> with the rfluxmtx command?
>
> Also, as reinhart.cal file been replaced for the reinhartb.cal?
>
> Best regards
> Humberto A.
>
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20160319/88ea9c35/attachment.html>