materials in radiance software

Hi,
Do you khow any websites that gives many examples of materials defined by their roughness and specularity fractions and RGB reflectance (examples carpet, mdf, aluminium, marble....) ? how can we choose the RGB colors in radiance when we have multicolor matérial like carpet?
thank you
imène SLAMA
National School of architecture of Tunis

···

___________________________________________________________
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Hi Imene

Do you khow any websites that gives many examples of materials defined by their roughness and specularity fractions and RGB reflectance (examples carpet, mdf, aluminium, marble....) ? how can we choose the RGB colors in radiance when we have multicolor mat?rial like carpet?

Somewhere within the Radiance src tree, there is a materials file of
typical building materials, including spec and rough. This has been
integrated in the Colour Picker for Radiance which you can find here:
http://www.jaloxa.eu/resources/radiance/colour_picker.shtml
Go Chooser > Building Materials

Multi-coloured materials are trickier and require some cal file. This
can be quite complicated to work out. Carsten Bauer developed some
mindbogglingly complicated examples for granit and other materials.
They were somewhere on his Radzilla web site (which is no longer
actively developed):
http://www.cb-d.de/radzilla.html

Unfortunately, all Radzilla download have been removed because the
code was getting too old. I might still have the Radzilla materials on
my hard disk at home. I shall try to get permission from Carsten and
send them to you, if you like. Please contact me off-list if you are
interested.

Determining spec and rough to any degree of accuracy is nighly
impossible. Your best bet is to do some test renders and compare them
to physical samples of the materials that you are trying to match.

Regards

Axel

Hi Imene,

> Multi-coloured materials are trickier and require some cal file. This
> can be quite complicated to work out. Carsten Bauer developed some
> mindbogglingly complicated examples for granit and other materials.
> They were somewhere on his Radzilla web site (which is no longer
> actively developed):
> http://www.cb-d.de/radzilla.html
>
> Unfortunately, all Radzilla download have been removed because the
> code was getting too old. I might still have the Radzilla materials on
> my hard disk at home. I shall try to get permission from Carsten and
> send them to you, if you like. Please contact me off-list if you are
> interested.

Carsten has just reminded me that his fancy materials collection is still available on radiance-online.org. He gave a presentation titled "Designer's Radiance" at the first Radiance workshop. You can find his material here:
http://www.radiance-online.org/radiance-workshop1/cd/Bauer/index.html
Thanks, Carsten!

What you want is the file desradaux.tar which is linked at the very bottom of that page.

I also forgot to mention that there are some very simple examples of material cal files in my Radiance tutorial, available from this page:
http://www.jaloxa.eu/resources/radiance/documentation/index.shtml

The examples are:
- a blue horizontal stripe across the wall
- random carpet tiles
- dust on the carpet tiles

Those examples are probably a much more accessible starting point than Carsten's super complicated granite tiles (which I have never managed to fully decipher)

Good luck to you.

Axel

Hi,
concerning values for specularity and roughness from measured scattering data, you might find
  http://www.pab.eu/gonio-photometer/demodata/bme/ useful.
It gives numbers of both for some materials. They depend on incident direction for most materials, but that's actually a problem of the model rather of the materials and their data.

best regards
Peter

    Hi,
    Do you khow any websites that gives many examples of materials defined by their roughness and specularity fractions and RGB reflectance (examples carpet, mdf, aluminium, marble....) ? how can we choose the RGB colors in radiance when we have multicolor matérial like carpet?
    thank you
    imène SLAMA
    National School of architecture of Tunis

···

________________________________________________

--
pab advanced technologies Ltd, http://www.pab.eu

Hi,
thank you Peter,
Imène

···

________________________________
De : Peter Apian-Bennewitz <[email protected]>
À : [email protected]
Envoyé le : Vendredi 13 juillet 2012 16h57
Objet : [Radiance-general] materials in radiance software

Hi,
concerning values for specularity and roughness from measured scattering data, you might find
http://www.pab.eu/gonio-photometer/demodata/bme/ useful.
It gives numbers of both for some materials. They depend on incident direction for most materials, but that's actually a problem of the model rather of the materials and their data.

best regards
Peter

Hi,
Do you khow any websites that gives many examples of materials defined by their roughness and specularity fractions and RGB reflectance (examples carpet, mdf, aluminium, marble....) ? how can we choose the RGB colors in radiance when we have multicolor matérial like carpet?
thank you
imène SLAMA
National School of architecture of Tunis
________________________________________________

-- pab advanced technologies Ltd, http://www.pab.eu

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