[Radiance-general] soft edged shadows

[Greg Ward]

Hi Kai,

Try rendering with -dj 0.7 or so.  If you are using rad, this can be  
done by setting PENUMBRA=True.

Best,
-Greg

> From: "Kai Babetzki" <babetzki at transsolar.com>
> Date: March 11, 2008 8:31:30 AM PDT
> Dear Radiance Community,
> I'm more a faithful reader (than writer) of this newsgroup due to  
> more common problems I had to deal with in the past.
> But in my current project the architect wants a horizontally fully  
> glazed roof for his atria. The roof height
> is 35m and due to sun protection reasons the roof should be fritted.
>
> The main design criteria is, that the fritting should be realized  
> in a way, that you can distinguish between shaded
> and alight areas on the floor.
>
> We did some very rough experiments and saw very weak edges between  
> shaded
> and alight areas. For the distance of 35 meters a shading element  
> has be at least 40cm wide to produce a distinguishable
>
> shadow on the floor.
>
> If I model this with Radiance the results show always very strong  
> shadows with very sharp edges and I can't see any expected  
> diffraction effects.
>
> Sorry for the long introduction but my question is very short: Is  
> it possible to model this effect with Radiance?
>
> Best regards,
> Kai