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See? I managed to butcher the English language myself! :)
GrimDude wrote in message <371d7bb9.0@news.povray.org>...
>>The camera is so close to the outer sphere, that the near part is
>>perspectively magnified so much, that it appears larger than the X/Y-plane
>>"equator" which lies farther back (and where the sphere really *do* meet
at
>>the edges as expected.
>>
>
>
>I was thinking of the set of solutions that satisfy a tangential line to
the
>point <-5,0,0> (assumed), but include the camera position. This set would
be
>null in that it cannot be satisfied from the current camera location,
except
>in orthographic projection (I think).
>
>Perspective magnification, spherical aberration,....? Stymied...
>
>Thanks for being agreeable. :)
>
>GrimDude
>vos### [at] arkansas net
>
>
>
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GrimDude <vos### [at] arkansasnet> wrote in message news:371d7f4a.0@news.povray.org...
> > My math was 100% correct for what I wanted it to do. It was
> >my understanding of the original question that is at fault here.
> >
> >--
> >Ken Tyler
> >
> >mailto://tylereng@pacbell.net
>
> Yeah, the question wasn't very well put. Misleading in fact.
I disagree. It seemed quite clear to me..not at all misleading.
----------------------
Andy
------------------------------------------------------------------------------------------
-
--The Home Of Lunaland--
--visit my POV-Ray gallery--
--listen to my music--
www.acocker.freeserve.co.uk
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TIC, Andy. :) The author implied it was the coding that was in error. No big
deal.
I continue to get email on this, so here's an overhead view with a cylinder
marking a straight line from the original camera point to the point in
question.
-----------------------------------
camera { location <0,20,-6> direction z look_at <0,0,-6> }
light_source { <0,0,-12> color rgb 1 shadowless }
background { color rgb 1 }
sphere{<0,0,0>,5 pigment{rgbf<0,0,1,.5>}}
sphere{<0,0,0>,2.5 translate -2.5*x pigment{rgbt<1,1,0,.5>}}
sphere{<0,0,0>,2.5 translate 2.5*x pigment{rgbt<1,1,0,.5>}}
cylinder { <0,0,-12>,<-5,0,0>,.05 texture { pigment { color rgb
<1,0,0> } } }
---------------------------------------
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Attachments:
Download 'Perspective.jpg' (9 KB)
Preview of image 'Perspective.jpg'
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Johannes Hubert wrote:
> Sorry Ken, but you got your maths wrong here.
> The spheres are scaled and translated correctly to give the expected result.
> Actually, they *do* give the correct and expected result!
>
> I agree with GrimDude: It is a problem of perspective.
>
> The camera is so close to the outer sphere, that the near part is
> perspectively magnified so much, that it appears larger than the X/Y-plane
> "equator" which lies farther back (and where the sphere really *do* meet at
> the edges as expected.
>
> I attached a screenshot from Moray where I recreated the scene and then
> marked the actual equator with red and the *percieved* outer edge with
> yellow (front, side, top and perspective view).
>
> So long,
> Johannes.
>
> [Image]
Yep, it is a matter of perspective and visual abberation. A picture is worth a
thousand words: <your spheres sliced in half>
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Attachments:
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Preview of image 'amigos.jpg'
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<body text="#000000" bgcolor="#FFFFFF" link="#FF0000" vlink="#800080" alink="#0000FF">
Try moving the camera Waaaay back, and setting the angle down to 5 or so.
<p>camera{location<0,50,-250> look_at<0,0,0> angle 5}
<p>Here is an example of what I did, and what you did wrong.
<br>
<p>--
<br>Bryan Valencia
<br>Software Services
<br><A HREF="http://www.209software.com">http://www.209software.com</A>
<br><A HREF="mailto:bry### [at] 209softwarecom">mailto:bry### [at] 209softwarecom</A>
<p>- "the gravest lie about Y2K matters, is that your company can,
<br>through the acquisition of affidavits of compliance, protect
<br>itself against harm, whether real or litigated. It can't.
<p>This faith in legal documents is hollow and in fact dangerous.
<br>The wisest course of action is for you to immediately disabuse
<br>yourself of this deceit."
<p>- from <A
HREF="http://language.perl.com/news/y2k.html">http://language.perl.com/news/y2k.html</A>
<br>
</body>
</html>
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Attachments:
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Download 'spherex.jpg' (9 KB)
Preview of image 'spheres.jpg'
Preview of image 'spherex.jpg'
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