[Radiance-general] mkillum parameters

[Greg Ward]

Hi Marija,

I missed this e-mail, but I guess everyone else did, too....

The compamb script only computes the ambient value for rpict and rvu  
in rad, not mkillum.  To get this, you are best off using the value  
given by gensky (assuming you're using gensky).  For example, "gensky  
8 10 15" spits out:

# gensky 8 10 15
# Local solar time: 14.77
# Solar altitude and azimuth: 47.3 70.4
# Ground ambient level: 18.1
(etc.)

For exterior calculations including mkillum, -av 18.1 18.1 18.1 would  
be appropriate.

As to the rest of the mkillum parameters, you have to think about how  
many bounces are important and set this yourself.  Rad is not smart  
enough to figure it out (and neither am I unless I know your geometry).

-Greg

> From: "Marija Cvetkovic" <cveleglg at bankerinter.net>
> Date: November 22, 2005 5:21:46 AM PST
>
> Hi,
> I am trying to use mkillum program, for window definition, from  
> rad. If I understood well I should have 2 lines in .rif file: illum  
> and mkillum.
>
> -illum line
> Should the file defined in this line contain both glazing material  
> and surface definition or it can contain only one of them?
>
> -mkillum line parameters:
> -ab 2 - I suppose this is enough since the environment is clear (no  
> obstructions)
> -as and -ad can be the default for rtrace
> -av - What exactly represents this -av value for mkillum?   How  
> could I compute it?  Would the calculation be accurate if this is 0?
>
> I am simulating simple room with a window on the South wall.
>
> If I run compamb with rif file containing this mkillum, would it  
> use the illum material data? I am asking this because in the book  
> it said that rad would take care for all changes in illum files,  
> but I am not sure if compamb would do that too.
>
> Thanks,
> Marija