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Questions, questions...
Does anyone know the physics behind holograms?
(Sorry - just received a brand new Windows 2000 CD yesterday. They like to
print holograms on 'em to prove they're real... yeah, right!)
More to the point, can I draw one with POV-Ray? :-)
Andrew.
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Andrew Coppin wrote:
>
> Questions, questions...
>
> Does anyone know the physics behind holograms?
For a wealth of resources on the physics and technology behind
those snazzy holograms visit - http://www.holoworld.com/
> More to the point, can I draw one with POV-Ray? :-)
Not directly. You could generate a pattern (image) in POV-Ray but you
would still need the laser technology to actually produce a physical
working hologram.
With sufficient effort you could probably figure out a way to simulate
one in POV-Ray but I wouldn't know where to start. You may want to visit
Rune's site and see what he did to create his compact disk object. The
iridescence seen on a CD is caused by the same basic principals behind
holograms.
http://runevision.com/3d/include/include.asp
--
Ken Tyler
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On Wed, 7 May 2003 20:25:47 +0100, "Andrew Coppin" <orp### [at] btinternet com> wrote:
> Does anyone know the physics behind holograms?
> (...)
> More to the point, can I draw one with POV-Ray? :-)
I have recently shared user_defined camera patch
(http://news.povray.org/search/?s=user_defined) prepared for MegaPOV with
http://www.bdp-optics.com/ . With this extension they are now able to prepare
material to 'print' 3D images directly from POV script
(http://news.povray.org/povray.binaries.images/31396/ ). I do not know details
behind 'printing' method but you can ask them about details and ordering.
ABX
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OK, on reflection maybe I was a little unclear. (Reflection, get it? Hehe...
eh... heh... oh never mind! :-P) What I ment was... can I put a hologram
into a POV-Ray scene?
Andrew.
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In article <3eb95e15$1@news.povray.org>,
"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> Questions, questions...
>
> Does anyone know the physics behind holograms?
http://www.wikipedia.org/w/wiki.phtml?search=hologram&go=Go
http://www.everything2.com/index.pl?node_id=615788
> More to the point, can I draw one with POV-Ray? :-)
A hologram requires optical effects that POV can not simulate directly.
You may be able to get something close to what a hologram made with a
very long wavelength would look like by combining functions, but it
would not work very well and would be very slow.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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In article <3eba08b7$1@news.povray.org>,
"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> OK, on reflection maybe I was a little unclear. (Reflection, get it? Hehe...
> eh... heh... oh never mind! :-P) What I ment was... can I put a hologram
> into a POV-Ray scene?
An actual hologram or something that looks like one? An actual hologram
is not practical, but emitting media is all that is necessary for making
something that looks like one.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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>
>> OK, on reflection maybe I was a little unclear. (Reflection, get it? Hehe...
>> eh... heh... oh never mind! :-P) What I ment was... can I put a hologram
>> into a POV-Ray scene?
> An actual hologram or something that looks like one? An actual hologram
> is not practical, but emitting media is all that is necessary for making
> something that looks like one.
>
That's right...
Here is example :
< http://www.irtc.org/ftp/pub/stills/2002-06-30/ddreams.jpg >
(ok, it's not a _really good one_, but it's mine ;)
--
________
_/ __/ __/ The answer is 42.
\__ \__ \_______________________________________________________________
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> http://www.wikipedia.org/w/wiki.phtml?search=hologram&go=Go
> http://www.everything2.com/index.pl?node_id=615788
Will check these out later...
> A hologram requires optical effects that POV can not simulate directly.
> You may be able to get something close to what a hologram made with a
> very long wavelength would look like by combining functions, but it
> would not work very well and would be very slow.
That's the information I was looking for.
Thanks.
Andrew.
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Andrew Coppin wrote:
> More to the point, can I draw one with POV-Ray? :-)
Could you fake a 3d hologram with some clever bounding - similar technique
to the 'infinity cube' ?
--
Rick
Kitty5 NewMedia http://Kitty5.co.uk
POV-Ray News & Resources http://Povray.co.uk
TEL : +44 (01270) 501101 - FAX : +44 (01270) 251105 - ICQ : 15776037
PGP Public Key
http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x231E1CEA
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In article <3ebbea18@news.povray.org>,
"Rick [Kitty5]" <ric### [at] kitty5com> wrote:
> Could you fake a 3d hologram with some clever bounding - similar technique
> to the 'infinity cube' ?
I don't know what you expect from this...I can't see how you would get
anything like a hologram this way.
You could make the hologram as an actual shape and just make it
shadowless, and maybe fool around with the diffuse and transparency. (a
hologram is transparent, it only adds to what is behind it)
Emitting media is probably the most accurate way, though...or at least
the most like a real-world hologram. Unless you're talking about the
silvery white-light things.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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