[Radiance-general] Radiance and road design

[Phillip Greenup]

Hi Pillo,

I don't know much about most of your question, but i can point you in the 
direction of an example application of the brtdfunc.  have a look at 
he.cal.  it doesn't actually work as well as it could (problems in 
calculation of z0 and Dsum2 which i had to fix up), but it is a working 
function file and example of application of brtdfunc.

good luck,
Phil.

At 08:44 pm 4/06/02 +0200, you wrote:
>Hi,
>here pillo (me, superBEGINNER, may be spiderBEGINNER)
>  with some questions about road design with Radiance:
>
>i would like to use UNI's r-tables (UNI 10489),
>where  r=[(luminance/illuminance)*cos3(g)],
>to describe asphalt behavior.
>i think BRDF is the way.
>but i need some advices:
>
>where i can found some examples of BRDF usage?
>is it possible only with r tables ?
>
>best regards,
>pillo
>
>PS r coefficients are measured at point P in function of the angle (g) 
>between source rays (looking at P) and  surface normal, and the horizontal 
>angle (b) between source rays and observation direction (looking at P).
>The observation direction has a vertical, fixed, angle of 1�.
>the source is tought punctual.