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Please excuse me if I'm not using the word 'tiles' in the context it
is used in POV-Ray. I couldn't think of a better phrase to put in
the subject line...
I need to know if it is possible to specify where on a sphere you
want an image to go without it completely filling the surface of
the sphere (by tiling or being stretched over the entire suface).
Maybe it would be clearer if I give an example. Suppose you
have a satellite image of Washington D.C., a satellite image of
the surrounding states, and a satellite image of the entire Earth
and you want to create an animation that zooms in from space
onto the D.C. image, utilizing all three images as resolution
demands.
comprising the entire surface of the Earth. The total dimensions
of all the tiles combined into a single image is way beyond what
my paint program can handle (please don't say get Photo Shop -
I know, I know). :-)
Can POV-Ray put those tiles into their respective positions on a
sphere according to user-defined inputs?
(That second example is what I may be dealing with.)
Regards,
Mike
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Wasn't it Michael Smith who wrote:
>Please excuse me if I'm not using the word 'tiles' in the context it
>is used in POV-Ray. I couldn't think of a better phrase to put in
>the subject line...
>
>I need to know if it is possible to specify where on a sphere you
>want an image to go without it completely filling the surface of
>the sphere (by tiling or being stretched over the entire suface).
>
>Maybe it would be clearer if I give an example. Suppose you
>have a satellite image of Washington D.C., a satellite image of
>the surrounding states, and a satellite image of the entire Earth
>and you want to create an animation that zooms in from space
>onto the D.C. image, utilizing all three images as resolution
>demands.
>
>comprising the entire surface of the Earth. The total dimensions
>of all the tiles combined into a single image is way beyond what
>my paint program can handle (please don't say get Photo Shop -
>I know, I know). :-)
>
>Can POV-Ray put those tiles into their respective positions on a
>sphere according to user-defined inputs?
>
>(That second example is what I may be dealing with.)
Here's a rather un-POVlike way of doing it:-
Instead of a true sphere, create a spherical mesh2 with a texture_list
listed tile is associated with each face of the mesh.
--
Mike Williams
Gentleman of Leisure
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Michael Smith wrote:
>
> [...]
>
> Maybe it would be clearer if I give an example. Suppose you
> have a satellite image of Washington D.C., a satellite image of
> the surrounding states, and a satellite image of the entire Earth
> and you want to create an animation that zooms in from space
> onto the D.C. image, utilizing all three images as resolution
> demands.
>
> comprising the entire surface of the Earth. The total dimensions
> of all the tiles combined into a single image is way beyond what
> my paint program can handle (please don't say get Photo Shop -
> I know, I know). :-)
>
> Can POV-Ray put those tiles into their respective positions on a
> sphere according to user-defined inputs?
Arbitrary map projections should be possible in Povray 3.5 using functions
as long as you know about the math of the projection. Note that not all
kinds of projection used in geography can be described through a precise
formula though.
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______
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Michael Smith wrote:
>
> Please excuse me if I'm not using the word 'tiles' in the context it
> is used in POV-Ray. I couldn't think of a better phrase to put in
> the subject line...
>
> I need to know if it is possible to specify where on a sphere you
> want an image to go without it completely filling the surface of
> the sphere (by tiling or being stretched over the entire suface).
>
> Maybe it would be clearer if I give an example. Suppose you
> have a satellite image of Washington D.C., a satellite image of
> the surrounding states, and a satellite image of the entire Earth
> and you want to create an animation that zooms in from space
> onto the D.C. image, utilizing all three images as resolution
> demands.
>
> comprising the entire surface of the Earth. The total dimensions
> of all the tiles combined into a single image is way beyond what
> my paint program can handle (please don't say get Photo Shop -
> I know, I know). :-)
>
> Can POV-Ray put those tiles into their respective positions on a
> sphere according to user-defined inputs?
>
> (That second example is what I may be dealing with.)
>
> Regards,
>
> Mike
Using 3.1, no. Man, now I have to go try to get this to work and stop my
housecleaning and database programming. (shucky darn ; ) )
I'll let you know what I find. It might even make a cyclopedia entry
Josh English
eng### [at] spiritone com
http://www.spiritone.com/~english
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There is a patch in MegaPov which allows you to use frequency, phase, and
once for spherical image maps. As is, it allows you to cut the map up into
strips which would then run pole to pole. I added to it the ability to use
two frequencies and two phases in order to cut a map up into tiles. So far I
have only used my patch privately. Email me privately if you want more info.
Are you using this with the Blue Marble dataset? That's what I am using it
for.
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Chris Jeppesen wrote in message <3c7e9b41$1@news.povray.org>...
>There is a patch in MegaPov which allows you to use frequency, phase, and
>once for spherical image maps. As is, it allows you to cut the map up into
>strips which would then run pole to pole. I added to it the ability to use
>two frequencies and two phases in order to cut a map up into tiles. So far
>I have only used my patch privately. Email me privately if you want more
>info.
I tried sending a couple of e-mails. Hope they got through.
>Are you using this with the Blue Marble dataset? That's what I am using it
>for.
Yep. :-)
Regards,
Mike
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