[Radiance-general] gendaymtx axis convention and -O 1 option.

[Germán Molina Larrain]

Dear Greg,

I think I will elaborate what I am trying to do first using the "gendaylit
| genskyvec", and see if it works, then I may ask these kind of things.

My idea was, indeed, to emulate a single-channel mode, as I did when I used
genBSDF for solar transmission. Of course, the materials wil have to be
adapted: I was planning to use spectrally averaged solar properties (grey
world), and I have no intention of obtaining lighting information out of
these calculatons.

As you might guess, I am not quite sure I know what I am doing, haha, but
my understanding is that it should work, right? My idea is to validate all
these, though.

THANKS

German


2013/3/11 Greg Ward <gregoryjward at gmail.com>

> Hi Germán,
>
> I am not quite sure how the new gendaylit -O option, which changes the
> incorporated spectrum, is supposed to interact with RGB colors in a
> Radiance scene.  You would have to redefine your materials to incorporate a
> different set of wavelengths and define what those are to really be
> consistent about it.  Doing everything in single-channel mode introduces
> another type of inaccuracy, one that is potentially greater than the
> difference between total flux and visible flux.  You really have to know
> what you're doing.
>
> -Greg
>
> *From: *Germán Molina Larrain <gmolina1 at uc.cl>
>
> *Date: *March 11, 2013 7:45:14 PM PDT
>
> *
> *
>
> Dear list,
>
> My bad, the convention is as I thought; and everything seem to work
> correctly.
>
> Still wondering about the -O option though.
>
> THANKS ANYWAY TO ALL
>
> German
>
> 2013/3/11 Germán Molina Larrain <gmolina1 at uc.cl>
>
>>
>> I heard that the link didn't contain the picture, so please try THESE ONE<https://df877ad7-a-62cb3a1a-s-sites.googlegroups.com/site/sunliteproject/comments/Captura%20de%20pantalla%202013-03-11%20a%20la%28s%29%2016.16.50.png?attachauth=ANoY7co5cT3MUan0PSt8V1eXcQFsQP07XGvfJTzgjR7-MHqlTTWcSbXshg7Q5EKnGMP0mBbaR16kG1xFkhx28qh8W95qwjlPh4WR8lh-C0u9AJMs4H-Ue8vYlhaUtznf5lWSpO1cNNhpsVnUkinVJh3mRSKFKCl67qiqi3ERF2Oplxb7_XRvBJQtkgmLEFAi4V89T2uTpHgesZbLGC0Y65L2XwdPxALmBC7lttmMM0xm7vONNM_0r8h84jI6JcrdIKW0r42XgdamQPHOwSP2QYuhkzoxhvDICA%3D%3D&attredirects=0>,
>>> and let me know if it does not work, to figure out something.
>>>
>>> THANKS
>>>
>>> German
>>>
>>>
>>> 2013/3/11 Germán Molina Larrain <germolinal at gmail.com>
>>>
>>>> Dear list,
>>>>
>>>> I was trying gendaymtx and the new dctimestep (it works excelent,
>>>> thanks to the developers), and noticed the following.
>>>>
>>>> I modeled a big cube, and set sensors pointing north, south, east and
>>>> west (the idea is that the cubes shades). Then, I made a DC matrix, created
>>>> the sky matrix; and dctimesteped all together (the weather used is
>>>> Montreal), and got THESE<https://sites.google.com/site/sunliteproject/comments>results.
>>>>
>>>> The sensors were defined (North, South, East and West, respectively)
>>>>
>>>> 0 3.1 1 0 1 0
>>>> 0 -3.1 1 0 -1 0
>>>> 3.1 0 1 1 0 0
>>>> -3.1 0 1 -1 0 0
>>>>
>>>> Anyway; North and South seem to be ok to me (simetric along the day,
>>>> and the south has more "sun" than north). But West and East seem to be
>>>> inverted...? and the east is more insolated in the afternoon? (I havent
>>>> really looked at the numbers themselves, but just to the tendency). *Can
>>>> there be a bug in the program??*
>>>>
>>>> On the other hand... is there any plan on adding the -O option to
>>>> gendaymtx, to get the solar intensities?
>>>>
>>>> THANKS TO EVERYONE IN ADVANCE
>>>>
>>>> German
>>>>
>>>>
>>>>
>>>
>>
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