hello,
After (a lot) of trial and error I came to the attached result. There
still is a problem with the horizon at the back: I want to soften or
blur it to make the landscape and the sky fade into each other and
become foggy or misty. I tried with adding fog but wasn't succesfull.
Any help or suggestions will be appreciated.
Thanks in advance.
regards

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Attachments:
Download 'sky.jpg' (11 KB)

Preview of image 'sky.jpg'

Try fog again?  What went wrong the first time you tried it?

BTW, using a heightfield as the clouds is a novel idea...

p.s. make the heightfield bigger, add a ground plane under it that is the
same color as the lowest color in the heightfiled, do the same with the
clouds.  This will make it look like the landscape and clouds continue on
(to some extent anyway).  Hope this helps!

--
Lance Birch
http://come.to/the.zone
Remove the smiley to e-mail.

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Maybe I'm wrong, but I suspect something :
isn't your camera INSIDE an object (big sphere,.. ?)?
In that case, fog won't appear; you must
make the object "hollow".

Fabien.

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hey### [at] omabe wrote:

> hello,
> After (a lot) of trial and error I came to the attached result. There
> still is a problem with the horizon at the back: I want to soften or
> blur it to make the landscape and the sky fade into each other and
> become foggy or misty. I tried with adding fog but wasn't succesfull.
> Any help or suggestions will be appreciated.
> Thanks in advance.
> regards

Say.. where did you get the cool europe heightfield?

Simon
http://home.istar.ca/~sdevet

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thanks for the comments but the problem remains unsolved:
1. using both types of fog, I can create a more realistic scene but
there remains some detail to be seen at the horizon: the separation
between clouds and landscape is still visible. looks like I can't
create fog that is strong or dense enough to hide all details at the
horizon.
2. I did not use any spheres or other closed objects; just 2
heigthfields. so, I am not inside an hollow object.
3. complete, detailed heightfields can be downloaded from:
http://edcwww.cr.usgs.gov/landdaac/gtopo30
gtopo30 is a global digital elevation model (DEM) with a horizontal
grid spacing of 30 arc seconds (approx. 1 kilometer).
further comments are welcomed.

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On Thu, 27 Aug 1998 14:45:25 GMT, hey### [at] omabe <hey### [at] omabe> wrote:
>thanks for the comments but the problem remains unsolved:
...
>2. I did not use any spheres or other closed objects; just 2
>heigthfields. so, I am not inside an hollow object.

(By the way, please don't post binaries in this group.  That's why there are
binaries groups.)

You can be inside a heightfield, as well.  If your sky heightfield isn't 
"upside-down" you will be inside of it.  Basically, the "inside" of an 
untransformed heightfield is everything with a y value below the level of 
the surface and with 0<=x<=1 and 0<=z<=1.  Yes, everything - heightfields 
are infinite objects, despite the fact that they are documented in the 
"finite solid primitives" section of the manual.

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In article <35e587e6.0@news.povray.org>, par### [at] my-dejanewscom says...

>Yes, everything - heightfields 
>are infinite objects, despite the fact that they are documented in the 
>"finite solid primitives" section of the manual.

Interesting, I didn't knew that !  I tought their inside was limited
to the 0,1 box...  
So they're a bit like planes...

To "heylen" : the parser should give you a warning message if the
cam'ra is inside something.  But your problem may be different...

Fabien.

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Fabien Mosen wrote:

> In article <35e587e6.0@news.povray.org>, par### [at] my-dejanewscom says...
>
> >Yes, everything - heightfields
> >are infinite objects, despite the fact that they are documented in the
> >"finite solid primitives" section of the manual.
>
> Interesting, I didn't knew that !  I tought their inside was limited
> to the 0,1 box...
> So they're a bit like planes...
>
> To "heylen" : the parser should give you a warning message if the
> cam'ra is inside something.  But your problem may be different...
>
> Fabien.

I think the problem doesn't lie in some construction error, but the fact that
it isn't all that easy to create a nice blurry horizon with fog layers. I've
tried myself a few times and it was a disaster. If anyone ever succeeded in
creating a nice distant fog that blurs out the horizon, I'd be really
interested in how he/she accomplished that.

JK

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>I think the problem doesn't lie in some construction error, but the fact
that
>it isn't all that easy to create a nice blurry horizon with fog layers.
I've
>tried myself a few times and it was a disaster. If anyone ever succeeded in
>creating a nice distant fog that blurs out the horizon, I'd be really
>interested in how he/she accomplished that.
>
>JK


Yes, please do tell, i'm still at the newbie stage and will soon be
attempting to add some haze to the horizon of my current study scene.
What i'm envisioning is the addition of enough fog to obscure but not
completely eliminate the horizon line on my heightfield ground plane.
Any hints on how to accomplish this will be much appreciated. Also, i
am interested in any good sky texture hints, specifically how do i
create nice 'fluffy' cirrus clouds.

Adrian Pederson

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