[Radiance-general] Compute direct component from sky only

[Thomas Bleicher]

On 22.09.2005, at 13:19, nick devlin wrote:

> Thomas,
>
> thanks for that. I had tried it in the past but rtrace returns
> values of zero!!
>
> I was confused about this, until I remember that for a uniform, or  
> overcast sky (the types I am testing), the sky is a glow source,  
> which I believe is not tested in the direct calculation.
> which means I am back to the drawing board.

You could probably replace your windows with illums
using mkillum and a higher -ab value. For your final
rtrace calculations you can use -ab 0 again and only
get the "direct" contribution of the window illum.

I have to admit that I don't know what causes your
problems and therefore this approche may fail as well.


Thomas