Unfortunately, I sound like a moron twice in the thread below.
Sounding like a moron, for me, is a side effect of having fun.
And these news groups are really fun.

    http://news.povray.org/povray.general/33056/

But my question remains.  Could I get some tips on using these
sky images?  Here is a bigger version if it's hard to see what's
going on in the jpg.

http://www.voltar.org/tmp/outdoorexp.snaps/2ndtry.png

The small portion of the image I got to image_map onto the sphere
is, of course, on the half of the sphere we can't see also.
Thus, the reflection on the sphere shows two suns... which isn't
at all what I desired obviously.

:(

-- 
If riding in an airplane is flying, then riding in a boat is swimming.
47 jumps, 13.2 minutes of freefall, 27.3 ff vertical miles.

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Attachments:
Download 'goophy.jpg' (16 KB)

Preview of image 'goophy.jpg'

>     http://news.povray.org/povray.general/33056/
>
> But my question remains.  Could I get some tips on using these
> sky images?

Look for info on the map_type keyword for spherical mapping. =)

 - Slime
 [ http://www.slimeland.com/ ]

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Well, it could be on Tatooine.. no? hehe

/Stefan

> The small portion of the image I got to image_map onto the sphere
> is, of course, on the half of the sphere we can't see also.
> Thus, the reflection on the sphere shows two suns... which isn't
> at all what I desired obviously.

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> Look for info on the map_type keyword for spherical mapping. =)

Doh!  OK, that's way more better.  It's hard for me to tell
what's happening here...  And the documentation isn't terribly
specific about how it maps the image onto the sphere.

Since the image is 9000x4500, I had guessed I want a radius of
4500.  It looks great, but I probably want something more like
9000 around?  9000 = 2pir so I want a radius of 9000/2*pi?

I suppose I could make a test image that's 9000x4500 that has
little obvious test patterns in each corner such that I could try
to guess what's going on...  But I suspect you'll give me a hint.

-- 
If riding in an airplane is flying, then riding in a boat is swimming.
47 jumps, 13.2 minutes of freefall, 27.3 ff vertical miles.

Post a reply to this message

> Since the image is 9000x4500, I had guessed I want a radius of
> 4500.  It looks great, but I probably want something more like
> 9000 around?  9000 = 2pir so I want a radius of 9000/2*pi?


The radius won't make a difference with spherical mapping, just as long as
the camera is in the center of the sphere. Use a sky_sphere, which is sort
of a sphere with infinite radius.

To see how the mapping works, make a small image in MS Paint or something
that's, say, 8x8, and put a checkerboard pattern on it. Then map it
spherically onto a sphere, and look at the sphere from the outside of it.
That should give you a good idea what's going on.

 - Slime
 [ http://www.slimeland.com/ ]

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Another way is to use a skycube.
IMHO, it's alot easier to handle when it comes
to resolution etc etc.

/Stefan

"Jettero Heller" <pov### [at] voltar-confedorg> wrote in message
news:slr### [at] corkyvoltar-confedorg...
> > Look for info on the map_type keyword for spherical mapping. =)
>
> Doh!  OK, that's way more better.  It's hard for me to tell
> what's happening here...  And the documentation isn't terribly
> specific about how it maps the image onto the sphere.
>
> Since the image is 9000x4500, I had guessed I want a radius of
> 4500.  It looks great, but I probably want something more like
> 9000 around?  9000 = 2pir so I want a radius of 9000/2*pi?
>
> I suppose I could make a test image that's 9000x4500 that has
> little obvious test patterns in each corner such that I could try
> to guess what's going on...  But I suspect you'll give me a hint.
>
> --
> If riding in an airplane is flying, then riding in a boat is swimming.
> 47 jumps, 13.2 minutes of freefall, 27.3 ff vertical miles.

Post a reply to this message