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

[Greg Ward]

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, 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 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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