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29 Jul 2024 12:24:20 EDT (-0400)
  problem with horizon line (Message 1 to 6 of 6)  
From: mitsch
Subject: problem with horizon line
Date: 4 Feb 2006 15:45:00
Message: <web.43e5114d4abdfce9d57abe90@news.povray.org>
hello,
i have a problem with the horizon line. i'm trying to create a scene with a
slightly
reflecting white ground, which fades into the background without a horizon
line. to realize this, i worked with a absolutely white sky sphere and a
white plane for ground with ambient 0.1 and reflection 0.3 finish values.
this works quite good. now the problem is, there is a simple glass panel in
the scene. through this glass panel, you can still see the horizon line. i
tried to avoid this with manipulating the finish values, moving around the
light sources or taking a huge hollow spuerquadratic ellipsoid for a
'round' horizon, but i didn't succeed. does anyone have a tip for me? mabye
there is a simple solution.


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From: Warp
Subject: Re: problem with horizon line
Date: 4 Feb 2006 18:32:39
Message: <43e53997@news.povray.org>
If everything else fails, try using a white fog...

-- 
                                                          - Warp


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From: mitsch
Subject: Re: problem with horizon line
Date: 5 Feb 2006 06:00:00
Message: <web.43e5da8dfe365532edc2a74b0@news.povray.org>
thanks for your reply!
with fog, i can avoid the horizon line. but it would be better not to have
fog in the foreground. is it possible to put 'bar' of fog just before the
horizon line? can i fill fog into a hollow object, or do i have to use the
scattering media?
mitsch


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From: Alain
Subject: Re: problem with horizon line
Date: 5 Feb 2006 11:55:50
Message: <43e62e16$1@news.povray.org>
mitsch nous apporta ses lumieres en ce 05/02/2006 05:59:
> thanks for your reply!
> with fog, i can avoid the horizon line. but it would be better not to have
> fog in the foreground. is it possible to put 'bar' of fog just before the
> horizon line? can i fill fog into a hollow object, or do i have to use the
> scattering media?
> mitsch
> 
> 
Fog can't be contained in a container, it fill the entire scene. Some solutions:
- Use a large distance value, something like 1000 or more. That way, the fog's effect
can be 
minimised to a negligeable level close by.
- Use a ground fog, but have the up vector been horizontal. Use a large negative value
for the 
altitude. You may need to use several fogs to surround the scene.
- Use a hollow torus with a very large main radius, say 10000 or more, and fill it
with media.

-- 
Alain
-------------------------------------------------
OK, so what's the speed of dark?


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From: mitsch
Subject: Re: problem with horizon line
Date: 5 Feb 2006 16:10:00
Message: <web.43e66981fe365532948376970@news.povray.org>
ok, i played around a bit with the fade distance and the position of the
light source. finally, i got a nice render. you can see now the glass panel
without horizon line and the reflection of the ground is fine, too. thanks
a lot for your help!

mitsch


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From: Thomas de Groot
Subject: Re: problem with horizon line
Date: 7 Feb 2006 03:23:01
Message: <43e858e5@news.povray.org>
"Alain" <ele### [at] netscapenet> schreef in bericht
news:43e62e16$1@news.povray.org...
> >
> Fog can't be contained in a container, it fill the entire scene. Some
solutions:
> - Use a large distance value, something like 1000 or more. That way, the
fog's effect can be
> minimised to a negligeable level close by.
> - Use a ground fog, but have the up vector been horizontal. Use a large
negative value for the
> altitude. You may need to use several fogs to surround the scene.
> - Use a hollow torus with a very large main radius, say 10000 or more, and
fill it with media.
>
....or use a vertical, transparant plane with normal pointing away from
camera. Do *not* make it hollow. The fog will only be present on the
normal-side of the plane.

... You may be able to contain a fog in a container by using inverse.

Thomas


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