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In article <3A1D4DE9.BBB7C7CC@xlstudio.com>, gemelli david
<d.g### [at] xlstudio com> wrote:
> 0.4 ??? I always used 0.6 ! oups ! need to change this in my last
> scenes to see the result... I'll post them again...
It would vary quite a bit with the exact kind of concrete, whether it is
wet, how weathered it is, if it is freshly cut or broken, how dirty it
is, whether vehicles with rubber tires have driven on it...you get the
idea, the range definitely covers both 0.4 and 0.6. And the color also
affects the result...halving the color would require doubling the
diffuse.
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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On Thu, 23 Nov 2000 19:15:51 +0200, Kari Kivisalo <kar### [at] kivisalonet>
wrote:
>That 0.4 was from a list describing "typical" reflectances. I bet there
>are construction companies that do 0.6 concrete :)
Any hint as of the location of this list? I am *very* interested.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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Peter Popov wrote:
>
> >That 0.4 was from a list describing "typical" reflectances. I bet there
> >are construction companies that do 0.6 concrete :)
>
> Any hint as of the location of this list? I am *very* interested.
I don't remember where this short list was.
specular aluminum 95%,
new snow 74%,
concrete 40%,
vegetation (mean) 25%,
asphalt 7%.
From here you get the full spectral data for materials.
http://www.cs.utah.edu/~bes/graphics/spectra/
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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