Looks good to me. Can't wait to see the complete camera.

Alf

PatchWerk <blu### [at] hotmailcom> wrote in message
news:38c00ec5@news.povray.org...
> This is the first iteration of this render. Done in MegaPov 0.4...  Still
> lacking some calibration marks around the circumference of the lens barrel,
> and have yet to incorporate any reflection_blur or radiosity... comments or
> suggestions welcome. I plan on eventually rendering the entire camera.
>
>
>

Post a reply to this message

Your clock appears to be a month behind :-/

--
___     ______________________________________________________
 | \     |_                 <dav### [at] faricynet> <ICQ 55354965>
 |_/avid |ontaine               http://www.faricy.net/~davidf/

"Sitting on a cornflake, waiting for the van to come" -Beatles

Post a reply to this message

"Mike Williams" <mik### [at] nospamplease> wrote in message
news:Nyl### [at] econymdemoncouk...
> Wasn't it Noah A who wrote:
>
> >i was looking at one just the other day and noticed that the protective
glass
> >has a purple oil on it or something
>
> That's not oil, it's the antireflective coating. It works by an
> interference process, similar to iridescence. It causes the reflected
> light to be dimmer and purpler than would be expected for that type of
> glass. I suppose the refracted light thereby becomes very slightly
> yellower.
>
> --
> Mike Williams * ##
> Gentleman of Leisure

...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.
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. In
response to several other responses... yes, it WAS hand-coded, although I
have since remodelled it in Moray, as the camera body is proving
signifigantly more difficult. 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. I'll have a new version posted within
a week or so. My hours at work have nearly doubled, and I won;t have as much
time to play.

Post a reply to this message

Isn't it terrible when work interferes with real life?

PatchWerk wrote:
> My hours at work have nearly doubled, and I won;t have as much
> time to play.

-- 
Mr. Art

"Often the appearance of reality is more important 
than the reality of the appearance."
Bill DeWitt 2000

Post a reply to this message

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/

Post a reply to this message

"PatchWerk" <blu### [at] hotmailcom> wrote in message
news:38c2577b@news.povray.org...
>
> 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.

Photons work fine on my measly P133.  I would do as Chris said and post a
bug report to the unoficial patches group.

Eric
--------------------
http://www.datasync.com/~ericfree
--------------------
"I don't like it, and I'm sorry I ever had anything to do with it."
- Erwin Schrodinger talking about Quantum Mechanics.

Post a reply to this message

Wasn't it Chris Huff who wrote:
>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.

Yes. I'd guess that the purpose of an antireflective coating is to
increase the amount of light that enters the camera. It's not possible
for the interference process to achieve this equally across the
spectrum, so the lens manufacturers choose to maximize the boost in the
yellow. The purpleness of the reflection would be a side effect of less
yellow being reflected.

-- 
Mike Williams * ##
Gentleman of Leisure

Post a reply to this message

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Mike Williams <mik### [at] nospamplease> wrote in message
Md6### [at] econymdemoncouk...
> Wasn't it Chris Huff who wrote:
> >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.
>
> Yes. I'd guess that the purpose of an antireflective coating is to
> increase the amount of light that enters the camera. It's not
> possible for the interference process to achieve this equally
> across the
> spectrum, so the lens manufacturers choose to maximize the boost in
> the yellow. The purpleness of the reflection would be a side effect
> of less yellow being reflected.
>
> --
> Mike Williams * ##
> Gentleman of Leisure



The antireflective coating is used to minimize the refraction of
bright lights falling into the photo field.
It works by making a gradual passage from the air IOR and the lens
one.
Thats the way it works but I really don't know hot to achieve the
same effect with povray.


Massimiliano Cirri

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com>

iQA/AwUBOMQ7mOrtz3m3qiy+EQIwnQCg/hVMNbdtss6JL+cxOpPT50czPogAoKDs
NlYLXg9K5P8Zvq4vbp2CPAGc
=yanQ
-----END PGP SIGNATURE-----

Post a reply to this message