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Hi all!
I'm about to start working on a new image which will be in widescreen format
(probably 2:1 or such, for a customized poster). I know that someone in
these newsgroups came up with an interesting camera tweak to get little to
no distortion in the image's edges (the well-known "my sun isn't spherical
in the corner"-problem).
Can anyone point me to the thread or just reply with the solution?
Thanks in advance,
regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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Oh, and I want horizontal lines to stay horizontal, not bent up and down
like the cylindrical camera does.
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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On Wed, 10 Nov 2004 16:40:00 +0100, "Tim Nikias"
<JUSTTHELOWERCASE:timISNOTnikias(at)gmx.netWARE> wrote:
> Oh, and I want horizontal lines to stay horizontal, not bent up and down
> like the cylindrical camera does.
If you would fail to find camera type you want, try:
http://megapov.inetart.net/manual-1.1/camera.html#user_defined_camera
ABX
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Do you mean like this?
http://news.povray.org/povray.binaries.images/thread/%3C3e2410ea@news.povray.org%3E/?ttop=189070&toff=1000
--
Jeremy
www.beantoad.com
"Tim Nikias" <JUSTTHELOWERCASE:timISNOTnikias(at)gmx.netWARE> wrote in
message news:41923656@news.povray.org...
> Oh, and I want horizontal lines to stay horizontal, not bent up and down
> like the cylindrical camera does.
>
> Regards,
> Tim
>
> --
> "Tim Nikias v2.0"
> Homepage: <http://www.nolights.de>
>
>
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Tim Nikias wrote:
> Oh, and I want horizontal lines to stay horizontal, not bent up and
> down like the cylindrical camera does.
Distortion is dependent on angle, not aspect ratio. Saying that the image
will be probably 2:1 doesn't tell us anything in this regard.
For shallow angles you won't have a problem at all. For wide angles (both
horizontal and vertical) I think that you can't *both* avoid perspective
distortion (which makes circles elliptical near the edges) *and* have
horizontal lines stay horizontal. You may be able to find some kind of
compromise though.
Rune
--
3D images and anims, include files, tutorials and more:
rune|vision: http://runevision.com
POV-Ray Ring: http://webring.povray.co.uk
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> Do you mean like this?
>
http://news.povray.org/povray.binaries.images/thread/%3C3e2410ea@news.povray.org%3E/?ttop=189070&toff=1000
Yup, I think that's it. I'll test and see if it's of use in this
non-architectural scene. :-)
Thanks!
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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> Distortion is dependent on angle, not aspect ratio. Saying that the image
> will be probably 2:1 doesn't tell us anything in this regard.
I think the main problem is the type of projection, not the angle itself.
What POV-Ray does is place a rectangle in front of the camera and shoot the
rays through that, and thus we get the distortion. I'm no expert on this,
and have spent only little thought on it, but if the area where the rays are
shot were concave instead of flat, and every point's normal would point
towards the camera, I think that the horizontal lines should stay
horizontal, and the vertical lines vertical, with no distortion whatsoever.
Unless the camera isn't aligned properly, that is...
If I'm mistaken, I hope someone will jump in and explain where and why...
:-)
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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> If you would fail to find camera type you want, try:
> http://megapov.inetart.net/manual-1.1/camera.html#user_defined_camera
Thanks for the note, but I'm actually a pure purist when it comes to making
my images, I like to rely on the official version. Mainly because every so
often, features of MegaPOV don't make it into the next release, or are very
different. And I'd rather have one or two older versions of the official
POV-Ray for all my images, than several official and unofficial compiles...
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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I suppose you could render the whole image using a standard camera at
640x480, then select the area you want on the render window, and render it
at a higher res.
Maybe that's not what you are after, but it might help until you get a
better soloution.
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Yes, that might also be a possibility. Would still result in one huge
picture if I want to render it at something like 100dpi for a larger print,
hence I wanted to use a specialized camera. It would also take care that the
resulting image would always be easily reproducable exactly without the need
to measure pixels...
Thanks though, I'll keep that in mind when the camera doesn't do as I would
like it to. :-)
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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