mcavoys[at]AOLdotCOM news:gh8ftv0ht8ol8potdin90b12kln1dgrnk3@4ax.com

> Do you meen a camera obscura?
> http://brightbytes.com/cosite/what.html

yes

> If so, I am impressed and want to see the end result.

No need to be impressed imho :) just a box{} differenced with cylider{}
placed in some testing environment... last render I did (with 1600 samples) 
took over day on 2.4GHz in 800x600, but I lost the result, I'll render it 
again in free time soon.

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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Stephen McAvoy <mcavoys[at]AOLdotCOM> wrote:
> Do you meen a camera obscura?
> http://brightbytes.com/cosite/what.html

  I thought that was called a pinhole camera.

  Well, it could have several names.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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On 11 Dec 2003 10:47:24 -0500, Warp <war### [at] tagpovrayorg> wrote:

>  I thought that was called a pinhole camera.
>
>  Well, it could have several names.

I'm no expert but I will give an opinion :-}
Some camera obscura(s) were pinhole cameras others had a lens and a mirror. The
later were often rooms on top of a high outlook. (There is one in Edinburgh
which is open to the public)  It relies on the room to be quite dark, not pitch

(about 25 euro cents) 

Regards
        Stephen

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"Stephen McAvoy" <mcavoys[at]AOLdotCOM> wrote in message
news:hl7htv06vipgepipbtgmk4vg5ta2n344hp@4ax.com...

> Some camera obscura(s) were pinhole cameras others had a lens and a
mirror. The
> later were often rooms on top of a high outlook. (There is one in
Edinburgh
> which is open to the public)  It relies on the room to be quite dark, not
pitch

6d
> (about 25 euro cents)
>
Camera Obscura translates to "Dark Chamber".  Most were pinhole types, hole
in one outside wall projected an inverted image agains the back wall.  Most
interesting effect, no focal plane, everything was in as sharp focus as the
aperture of the pinhole would allow, the smaller the better.  Some modern
sun photography and other experiments are being done with variations of the
pinhole now.  With proper pinhole to film lengths it can give quite good
images, and there's no shortage of light.

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r.b### [at] sbcglobalnet news:3fd8cfe1$1@news.povray.org

> interesting effect, no focal plane, everything was in as sharp focus
> as the aperture of the pinhole would allow, the smaller the better. 
> Some modern 

Exacly. Using 1600 count the hole must be quite big with gives extremly 
strong focal blur.

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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Stephen McAvoy wrote:

> On 11 Dec 2003 10:47:24 -0500, Warp <war### [at] tagpovrayorg> wrote:
> 
> 
>> I thought that was called a pinhole camera.
>>
>> Well, it could have several names.
> 
> 
> I'm no expert but I will give an opinion :-}
> Some camera obscura(s) were pinhole cameras others had a lens and a mirror. The
> later were often rooms on top of a high outlook. (There is one in Edinburgh
> which is open to the public)  It relies on the room to be quite dark, not pitch

> (about 25 euro cents) 
> 
> Regards
>         Stephen

And a really nice one in San Francisco right down at the water's 
edge (see http://www.giantcamera.com/pages/893224/index.htm )

One of the oldest is in Pompeii (no lens or mirrors of course) where 
a room with an exterior wall is entered from the inner covered 
coutyard.  After dark adaptation you can see the outside scene 
upside down and reversed ... and image chariots rolling past.

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