[Radiance-general] trans or glass material, rectangular luminous opening problem

[Rob Guglielmetti]

Gregory J. Ward wrote:

>> 2. I have .ies data of a rectangular flood light and convert it  into 
>> a radiance file. Although the resulting Polygon is glowing,    the 
>> light output  seems to come from the middle of the polygon and  not 
>> from the whole area. Is this correct?
>
> That is correct.  If you set the -dj option to something between 0.5  
> and 0.8, you will sample over a larger subregion.  (A setting of -dj  
> 1 is allowed, but only works if all the sources in your scene are  
> rectangular.)


Christian, are you referring to the appearance of the illuminance patch 
on a surface near the source, or rather the apparent brightness of the 
source polygon?  If the former, this could be the result of having -ds 
set too low.

- Rob Guglielmetti
www.rumblestrip.org