[Radiance-general] Illuminance values

[G V DEEPAK]

Thank you very much,

I just wanted to know this.

Thank you

On Wed Mar 18 11:15:30 EDT 2009, "Lars O. Grobe" 
<lars.grobe at nus.edu.sg> wrote:

> Hi...
>> I am simulating to find illuminance values for different angles 
>> of
>> Venetian blinds, Using Mkillum.. Do we need to consider Blinds 
>> as part
>> of the Luminous plane generated by mkillum..? We are getting 
>> better
>> results when using just a plane polygon as Luminous secondary 
>> source
>> as compared to when we include Blinds in the fenestration system 
>> as
>> luminous plane. ( comparing two different systems of blinds of 
>> similar
>> angles and characteristics.)
> If I understand you right - are you asking wether to replace the 
> each
> blind's surface by a mkillum-generated illum??? This makes no 
> sense -
> you have aluminium blinds, and no light will pass through a 
> blind. This
> must lead to really funny results.
> 
> Mkillum has been written to precalculate the effect of compex
> fenestration such as blinds. You calculate a light source on the 
> inside
> of the complex fenestration using mkillum, so that during your 
> (rpict or
> rtrace) rendering, the light source for ambient calculations is 
> not
> obstructed. The reasons for this are explained in detail in the 
> book
> "Rendering with Radiance".
> 
> In your case there are only two reasonable options as far as I
> understood so far. Either render without mkillum, but very(!!!)  
> high
> quality settings for ad, as, aa, ab (which will take a long 
> time), or
> seal your complete fenestration system with mkillum-generated 
> illum
> surface(s) as explained in the book.
> 
> 
> CU Lars.
> 
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> 



G V DEEPAK
Graduate Research Assistant
M.E. Rinker, Sr. School of Building Construction.
University Of Florida.