[Radiance-general] Help - Radiance / LEED

[Lars O. Grobe]

Hi Ignacio!

It is always a bit confusing when folks think they ask about Radiance, 
but actually have questions related to Ecotect's user interface. So 
without knowing Ecotect, I try to help a bit:

> - The first is how to specify Radiance calculate irradiance
>
> I was searching where to specify -I (the capitol i) to rtrace in
> Radiance to calculate irradiance instead radiance and I found in
> Autodesk Ecotect Calculation wizard - Radiance Analysis (step 10-11) the
> -I blank, but i dont know what to do because is already wrote and have a
> blank beside. Others command have diferents values. I´m in the right
> place to specify?

Probably the blank is because "-I" is a switch to get irradiance instead 
of radiance as output. So you do not pass any value (and thus there also 
cannot be a default). Basically rtrace -I interpretes input 
coordinates/directions as sensor locations (coordinate) and sensor view 
directions (directions). So 0 0 0 0 0 1 would be location (0,0,0) 
pointing up (0,0,1).

> - My second doubt is in what place i need to "mutiply the rgb
> irrandiance values by V lambda" I need to be in Analysis Grid Management
> - Edit Grid Data in Ecotect ?

No idea, usually you need to weigh the RGB (unless you do everything 
with grey values) and multiply with the luminous efficacy in Radiance to 
get from radiometric to photometric units, but I have no clue where this 
is hidden in Ecotect.

Cheers, Lars.