In article <38c2577b@news.povray.org>, "PatchWerk" 
<blu### [at] hotmailcom> wrote:

> ...it does indeed work by an interference process, and it is indeed 
> the very process we call iridescence... although the incoming 
> (refracted) light remains largely unaffected, as the multiple glasses 
> inside the lens seem to cancel each other's color out.

That would be for achromatic lenses, then. I have seen this iridescence 
on the lenses of pretty cheap cameras, which would probably not have 
achromatic lenses. The effects from the iridescence are probably just 
too small to notice.


> unfortunately, said process in POV (or MegaPov, AFAIK, cannot be 
> accurately rendered. I'm going to try a reflection_color and see if 
> that works.

Actually, there is an iridescence feature in the official version of POV.
I don't know how accurate it is...probably not very. But how much 
accuracy do you need for the iridescence on a camera lens?


> There are no photons, as I am using a Pentium 166, and photons don't 
> seems to function below P2, causing my machine to crash when photon 
> calculation starts.

That isn't good...can you provide more details about when it crashes and 
what causes the crash? This should probably be continued in 
povray.unofficial.patches.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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