pierre nous apporta ses lumieres en ce 7 / 05 / 2007 04:10:
> Hello everybody,
> I have measured a surface of metal with a topographical instrument. Hence my
> surface is composed of many micro facet.
> My goal is to study the surfacic diffusion of light onto this surface (like
> the gloss...). I need to make physically realistic simulation.
> My problem is to set the finish of my object to fullfill my objectif.
> 
> Do you have any idea of howw I should proceed?
> I join what i tried:
> /////
>  finish{
> 
>         diffuse 0
>         ambient 0
>         conserve_energy
>   reflection {
>     0.0, 1.0
>     fresnel on
> 
> }
> specular 1
> 
> }
> 
>        interior{ior 1.5}
> /////
> 
> Thanks by advance
> pierre
> 
> 
Use your collected data into a mesh or use it to generate a height_field.
A metal don't have an index of reflection, or can be assumed to have a very, 
very large one. If you use it and fresnel on, it simulate a glazed, oily, or 
varnished surface.
Usualy, a metalic surface reflectivity is mostly constant, using reflection{0,1} 
you deffine a surface that don't reflect light comming in a perpendicular 
direction, and reflect totaly at grazing incidence. Beter to use a constant 
reflection 0.9. (use a value between 0.7, slightly mate, and 0.95, highly polished)
The specular keyword is used to simulate the surface diffusion of light from a 
source of illumination. phong do the same, but using a slightly different algotythm.

-- 
Alain
-------------------------------------------------
HAMMER:  Originally employed as a weapon of war, the hammer nowadays is used as 
a kind of divining rod to locate expensive bike parts not far from the object we 
are trying to hit.

Post a reply to this message