[Radiance-general] questions about material in radiance

[Axel Jacobs]

Hi Imene,

> materials are defined in radiance by their RGB colors and by their
> specularity and roughness. I'm trying to test different materials
> given in radiance tutorial and I have a question about
> metal2 rolled_aluminium defined :
> void metal2 rolled_aluminium
> 4 0 0 1 .
> 0
> 6 .31 .31 .31 .68 .04 .09
> what is the signification of the first line : 4 0 0 1 . ?
> What can we put in the second line defined in this example by 0
> Why do we define 6 arguments and not 5 in the last line and what is .09

The Radiance material specifications are explained in the Radiance
Reference Manual:
http://radsite.lbl.gov/radiance/refer/refman.pdf

The metal2 material has anisotropic roughness. The direction of the
anisotrophy is defined by the vector in the 2nd line (0 0 1). The
urough and vrough values (0.04 and 0.09) define the roughness
perpendicular to the roughness vector.
See 'plastc2' on p7 and 'metal2' on p8 of the Reference manual.

> If i want to test this material in colour picker for radiance
> given in this site : http://www.jaloxa.eu/resources/radiance/colour_picker/index.shtml
> where can I write the arguments of the first line ?

The Jaloxa colour picker only supports 'plastic' and 'metal'. Sorry.

Regards

Axel