ryan constantine wrote:
> 
> here are some planet image maps i made in paint shop pro

The shadows seems a bit bright.. a thick atmosphere and/or moonlight can
help spread the light around a little, but generally, shadows in space
are very, VERY dark (you'd be amazed just how weak ambient starlight is
by itself).

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"Andrea Ryan" <ary### [at] global2000net> wrote in message
news:396C72C4.44097E4E@global2000.net...
| Could spots that look like Jupiter's Great Red Spot be made?

Yes, in a way, using the 'black_hole' warp in the pigment.  Problem is you
need a color for it already present in the gradient color map, and it's just
not easy to work with in my experience anyway.  A layered texture could do
fairly well but then you don't get the good transition from lines to spot you
could get with the warp.

Bob

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Not intentionally moving in on you Ryan but I've posted my idea of Jupiter at
povray.text.scene-files, can't miss it, subject says "Jupiter-like".  Nothing
perfected about it at
all, something for anyone to tinker with though.

Bob

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i was thinking it would be cool if there were a "spin" and a "wind"
pattern or warp in povray.  what you would do is use it in a layered
texture.  all other layers would define the patterns and colors, and
then the wind and spin would streak it in a certain direction.  wind
would be linear and spin would be axial.  any programmers out there
reading this?

Bob Hughes wrote:
> 
> "Andrea Ryan" <ary### [at] global2000net> wrote in message
> news:396C72C4.44097E4E@global2000.net...
> | Could spots that look like Jupiter's Great Red Spot be made?
> 
> Yes, in a way, using the 'black_hole' warp in the pigment.  Problem is you
> need a color for it already present in the gradient color map, and it's just
> not easy to work with in my experience anyway.  A layered texture could do
> fairly well but then you don't get the good transition from lines to spot you
> could get with the warp.
> 
> Bob

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say hello to mister gamma.  on my monitor, the shadows ARE very dark. 
no color at all.:(  maybe i should do that gamma test someone mentioned.

Xplo Eristotle wrote:
> 
> ryan constantine wrote:
> >
> > here are some planet image maps i made in paint shop pro
> 
> The shadows seems a bit bright.. a thick atmosphere and/or moonlight can
> help spread the light around a little, but generally, shadows in space
> are very, VERY dark (you'd be amazed just how weak ambient starlight is
> by itself).

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Each band can be given turbulence by having a layered texture that are partly
transparent except for
some bands.  There will be one texture for each color of band.  Each texture will have
different
amounts of turbulence.
Here is a image of Jupiter and Io using image_maps.
Now I'm off to POV-Ray to try out the layered texture idea.
Brendan

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Attachments:
Download 'jupiter.jpg' (9 KB)

Preview of image 'jupiter.jpg'

In article <396CE66F.D1AD3870@yahoo.com>, ryan constantine 
<rco### [at] yahoocom> wrote:

> i was thinking it would be cool if there were a "spin" and a "wind"
> pattern or warp in povray.  what you would do is use it in a layered
> texture.  all other layers would define the patterns and colors, and
> then the wind and spin would streak it in a certain direction.  wind
> would be linear and spin would be axial.  any programmers out there
> reading this?

I have done a "push" warp, which displaces a texture in a specified 
direction by an amount depending on how close it is to the center of the 
warp. I am also planning a spin warp, which would be similar to what you 
described, but would have a spherical range of effect.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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ryan constantine wrote:
> 
> say hello to mister gamma.  on my monitor, the shadows ARE very dark.
> no color at all.:(  maybe i should do that gamma test someone mentioned.

Ah, of course. The gamma.

(I'm on a Mac.)

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win98 here.  that explains it.  assumed gamma of 2.2.

Xplo Eristotle wrote:
> 
> ryan constantine wrote:
> >
> > say hello to mister gamma.  on my monitor, the shadows ARE very dark.
> > no color at all.:(  maybe i should do that gamma test someone mentioned.
> 
> Ah, of course. The gamma.
> 
> (I'm on a Mac.)

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"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-18F203.21555912072000@news.povray.org...
|
| I am also planning a spin warp, which would be similar to what you
| described, but would have a spherical range of effect.

Which leads me to ask about nonuniform scaling of warps.  I tried in vain to get the
Great Red Spot
to flatten out.  Only succeeded in moving it around.
This wind idea is a good one for sure, sounds like a matrix kind of thing.

Bob

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