Radiance and road design

radiance-general
1

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.

2

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.

3

thanks a lot!!!!!!!
i had some problem with my mail server, so my thanks arrive late, but: thanks a lot again.
pillo

PS.
UNI stands for Italian comitee for standardization of norms.
http://www.uni.com/eng/index.shtml

···

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.

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