On Tue, 15 Apr 2003 22:22:38 -0400, Steven Pigeon wrote:

> "Greg Edwards" <edw### [at] hotmailcomremovethis> wrote in message
> news:buddanmyxaon.1chgehx1p57y4$.dlg@40tude.net...
>> On Mon, 14 Apr 2003 21:04:00 +0100, Andrew Coppin wrote:
>>
>>> How the hell did you get that carpet to look so real?
>>
>> It looks like an image map. Sorry to disappoint you though... :-(
> 
> Indeed. Plus wrinkles.
> 
> But I wanted to know about the glass.
> I found that dispersion gives a slightly greenish
> tint to it, even in area where there's no dispersion...
> 
> best,
> 
>         S
> Steven Pigeon, Ph. D.
> pig### [at] iroumontrealca
> 
>>
>> --
>> light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
>> 20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

That's because by the nature of POV's dispersion, not every wavelength is 
sampled and since only the used hues are averaged, some hue peaks 
(particularly purple (because it's split between the beginning and the end 
of the spectrum?)) don't get evaluated correctly.

-- 
light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

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