[Radiance-general] Daylight matrix - vu

[Andrew McNeil]

Hi Vayia,

Unfortunately genBSDF assumes that the two apertures of your system are
parrallel and rectangular, so i don't think your light pipe BSDF will be
valid. Greg has written a new tool, rfluxmtx, that will allow you to
generate a coefficient matrix for a relationship between arbitrary
polygons. Your model is a good example of what wasn't possible before that
is enabled by the new tools.

Unfortunately there's not much documentation of rfluxmtx other than the man
page. I'm working on providing a three-phase simulation example using
rfluxmtx hopefully ready by the workshop in September.

Best,
Andy


On Thu, Jul 31, 2014 at 4:53 AM, Vayia Koukouvayia <vaia13 at msn.com> wrote:

> Hello all,
>
>
>  I am trying to simulate light pipes with the three phase method. Since
> the pipes are not straight I need to be sure that the vectors I set are
> correct and I am a bit confused about what the "vu" vector stands for. So
> here is what I did.
>
>
> The room with the pipes is oriented towards the northeast and the pipe
> bending is towards the southwest. I generated the BSDF through a model
> where the pipe bending part is facing towards the -y axis.  I attached a
> small picture to make it clearer. So here are some of my questions.
>
>
> What should the "vu" be at the daylight matrix? I am not sure which axis
> of the BSDF corresponds to the "vu". My guess is that "vu" should be 1,
> 1, 0 or 1, -1, 0? Should the pipe model from which I generate the BSDF be
> correctly oriented as well?
>
>
>
> Is there any way to have the model of the room oriented towards the north
> (y axis) and then set the correct orientation via the "vu" or some other
> way?
>
>
> I thank you in advance,
>
>
> Vayia
>
> _______________________________________________
> 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/20140731/b7c5de27/attachment.html>