roughness & dispersion_coefficient_B

t_3 · Tue Dec 06, 2011 9:14 pm

does anybody know what unit or parameter the roughness value is in? beeing a physically correct renderer

i expect something like RzDIN, Ra, Rtm?

and, by the way, has anyone a resource or practical description how the dispersion coefficient B is to handle? have read in the wikipedia about dispersion but don't really know how to make use of it...

t_3 · Sat Dec 24, 2011 4:59 am

so the silence leads to an answer like "no one"?

well, meanwhile i have compiled a list of gemstones/minerals together with their ior and dispersion values:
http://dl.dropbox.com/u/10375307/IOR_Di ... Values.pdf
have fun with these (and make them gems glow)...

Sat Dec 24, 2011 9:14 am

t_3 wrote:does anybody know, what unit or parameter the roughness value is in? beeing a physically correct renderer i expect something like RzDIN, Ra, Rtm?

and, by the way, has anyone a resource or practical description how the dispersion coefficient B is to handle? have read in the wikipedia about dispersion but don't really know how to make use of it...

dispersion in many rendering softwares is called Abbe...If I remember well...
would be nice if Octane have the possibility to load ior files like Maxwell.