I generally don't consider myself to be an absolute beginner in these
things, as I have been tinkering with POV-Ray for the better part of two
years, but I also realize that I don't have quite the experience that
many others do, so please forgive my ignorance.

I'm looking for a good means of determing an effective way to use fog.
Whenever I attempt to use it, I get a semi-visible scene or a scene with
a semi-visible background.  While this has its uses, I would be thrilled
if anyone could provide a clearer (in depth, perhaps) explanation of fog
and the various and sundry means of using it to maximum effect.

Thanks...

Klauss,
Master of the Sewers

Post a reply to this message

Klauss, Master of the Sewers wrote:
> 
> I generally don't consider myself to be an absolute beginner in these
> things, as I have been tinkering with POV-Ray for the better part of two
> years, but I also realize that I don't have quite the experience that
> many others do, so please forgive my ignorance.
> 
> I'm looking for a good means of determing an effective way to use fog.
> Whenever I attempt to use it, I get a semi-visible scene or a scene with
> a semi-visible background.  While this has its uses, I would be thrilled
> if anyone could provide a clearer (in depth, perhaps) explanation of fog
> and the various and sundry means of using it to maximum effect.
> 
> Thanks...
> 
> Klauss,
> Master of the Sewers

Funny that you ask this today. I just started toying with fog today.
I've just been testing a bunch of different values for the same image to
see what they do. This is in no way efficient, but i *almost* have the
desired effect that i wanted. The problem is that the sky in the
landscape i am doing is barely visible. I have the fog how i want it in
the distance, just like a ground fog up close and constant fog way back.
Ussually when you see a haze in the distance, you still can see the sky
rather clearly close to you. So, anyway, I think it would be great also
if someone could do a nice once over on the fog issue.

Ross
-- 
----------------------------------------------------
"Treat the earth well: it was not given to you by
your parents, it was loaned to you by your children.
We do not inherit the Earth from our Ancestors, we 
borrow it from our Children." 
----------------------------------------------------

Post a reply to this message

OK, let's see if I can clear things up a bit (Oh geez, was that a pun?).  The
problem with using fog with skies is that a constant fog is infinite, which is
unrealistic.  The haze visible in  a real sky is caused by looking through a
layer of atmosphere that covers the earth.  Therefore it will always hide the
background color of a sky unless tranparency is added to the color of the
fog.  This won't create a realistic horizon because you won't get that soft
band of white.  The best way to do it is to use a ground fog and just play
with the distance so that you can see through the fog to the sky overhead and
so edge of the horizon is covered by the fog.  I wrote a short example of how
to create a sky on my web page and it gives a few examples on how to use a
ground fog:

http://members.aol.com/amaltheaj5/skytut1.html

-Mike



Ross Litscher wrote:

> Funny that you ask this today. I just started toying with fog today.
> I've just been testing a bunch of different values for the same image to
> see what they do. This is in no way efficient, but i *almost* have the
> desired effect that i wanted. The problem is that the sky in the
> landscape i am doing is barely visible. I have the fog how i want it in
> the distance, just like a ground fog up close and constant fog way back.
> Ussually when you see a haze in the distance, you still can see the sky
> rather clearly close to you. So, anyway, I think it would be great also
> if someone could do a nice once over on the fog issue.
>
> Ross
>

Post a reply to this message