In article <3d3af599@news.povray.org>,
 "TinCanMan" <Tin### [at] hotmailcom> wrote:

> >       dispersion 1.4 dispersion_samples QQ_Disp //  <== PROBLEM
> 
> 1.4 is quite high for dispersion, realistic values are in the range of  1.01
> or so.  1.1 can give nice but unrealistic results.  The dispersion value is
> basically the ratio of the ior for red to the ior for violet for a given
> material.   I have an ior include file that has iors and dispersion values
> for a lot of different materials and that is essentially how the values
> look:
> 
> ior = (ior_red+ior_violet)/2
> dispersion = ior_red/ior_violet

Also, consts.inc has dispersion values defined for quartz glass, water, 
diamond, and sapphire.
Unrealistic values can give interesting effects though...in 
newdiffract.pov I used 0.1.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

Post a reply to this message