I'm currently visiting the Blue Ridge Mountains in North Carolina, and
the mist in the air reminds me of when I visited the Shenandoah
Mountains in northwestern Virginia 13 years ago, and why I implemented
hills the way I did in my 3rd generation render rig.  Compare this with
the hills of my 4th generation reboot.

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Hi(gh)!

On 20.09.21 05:07, Cousin Ricky wrote:
> I'm currently visiting the Blue Ridge Mountains in North Carolina,

<Fleet Foxes>
In the quivering forest where the shivering dog rests
our good grandfather built a wooden nest...
</Fleet Foxes>

...did you also miss your connecting flight?

> and
> the mist in the air reminds me of when I visited the Shenandoah
> Mountains in northwestern Virginia 13 years ago, and why I implemented
> hills the way I did in my 3rd generation render rig.  Compare this with
> the hills of my 4th generation reboot.
> 

Very atmospheric!

See you in Khyberspace!

Yadgar

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Il 20/09/2021 05:07, Cousin Ricky ha scritto:
 > I'm currently visiting the Blue Ridge Mountains in North Carolina, and
 > the mist in the air reminds me of when I visited the Shenandoah
 > Mountains in northwestern Virginia 13 years ago, and why I implemented
 > hills the way I did in my 3rd generation render rig.  Compare this with
 > the hills of my 4th generation reboot.
 >

The 4th generation mountains looks very convincing, maybe it would take 
a bit of bush at the base.

A nice place!
Paolo

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Op 20/09/2021 om 05:07 schreef Cousin Ricky:
> I'm currently visiting the Blue Ridge Mountains in North Carolina, and
> the mist in the air reminds me of when I visited the Shenandoah
> Mountains in northwestern Virginia 13 years ago, and why I implemented
> hills the way I did in my 3rd generation render rig.  Compare this with
> the hills of my 4th generation reboot.
> 

Yes? However, now I would like to see a combination of both: hills (4th) 
with haze (3rd). I am effectively missing a (bluish) distant haze in the 
4th generation hills, which, you certainly have observed. Similarly, in 
France, when visiting the Vosges region, one speaks of "La ligne bleue 
des Vosges" i.e. "the blue line (or silhouette) of the Vosges".

-- 
Thomas

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On 2021-09-21 2:27 AM (-4), Thomas de Groot wrote:
> 
> Yes? However, now I would like to see a combination of both: hills (4th)
> with haze (3rd). I am effectively missing a (bluish) distant haze in the
> 4th generation hills, which, you certainly have observed. Similarly, in
> France, when visiting the Vosges region, one speaks of "La ligne bleue
> des Vosges" i.e. "the blue line (or silhouette) of the Vosges".

Yes, I have indeed noticed that.  Sky is something I've been struggling
a long time to get right, and this certainly isn't the final form.  I
have a lot to learn about what colors the sky.  There is a blue haze in
the 4th generation image, but it is subtle.  I used just enough ground
fog to reproduce the brightness gradient I see in photos, but this
doesn't seem to translate well to extinction.  I wonder if this is
because POV-Ray's ground fog is flat, while the Earth is not.  There is
also turbidity to be considered.

The color of the haze also varies depending on what's in the air.  In
the Caribbean, it is whitish when Sahara dust crosses the Atlantic.  In
the northeastern USA, the haze is brownish, I presume due to nitrogen
oxides.

I see media in a future implementation, but it is currently low priority.

Attached are 1st and 4th generation scenes.  I wrote the first
generation render rig in 2003 withing a month of downloading POV-Ray,
and as you can see, the sky is just a plain background.  The 4th
generation scene has the hills maxed out at 5000 meters, and I
implemented the rig so that higher elevation caps push the hills
proportionately further into the background.  It's been a few years
since I wrote the code, but I estimate the hills are on the order of 20
km away from the camera.

A 2nd generation scene is not shown, because it did not provide an
automatic sky.

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On 2021-09-21 2:27 AM (-4), Thomas de Groot wrote:
> 
> Yes? However, now I would like to see a combination of both: hills (4th)
> with haze (3rd). I am effectively missing a (bluish) distant haze in the
> 4th generation hills, which, you certainly have observed. Similarly, in
> France, when visiting the Vosges region, one speaks of "La ligne bleue
> des Vosges" i.e. "the blue line (or silhouette) of the Vosges".

I can also turn everything blue by using the indoor film setting.

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Op 22/09/2021 om 20:57 schreef Cousin Ricky:
> On 2021-09-21 2:27 AM (-4), Thomas de Groot wrote:
>>
>> Yes? However, now I would like to see a combination of both: hills (4th)
>> with haze (3rd). I am effectively missing a (bluish) distant haze in the
>> 4th generation hills, which, you certainly have observed. Similarly, in
>> France, when visiting the Vosges region, one speaks of "La ligne bleue
>> des Vosges" i.e. "the blue line (or silhouette) of the Vosges".
> 
> Yes, I have indeed noticed that.  Sky is something I've been struggling
> a long time to get right, and this certainly isn't the final form.  I
> have a lot to learn about what colors the sky.  There is a blue haze in
> the 4th generation image, but it is subtle.  I used just enough ground
> fog to reproduce the brightness gradient I see in photos, but this
> doesn't seem to translate well to extinction.  I wonder if this is
> because POV-Ray's ground fog is flat, while the Earth is not.  There is
> also turbidity to be considered.
> 
> The color of the haze also varies depending on what's in the air.  In
> the Caribbean, it is whitish when Sahara dust crosses the Atlantic.  In
> the northeastern USA, the haze is brownish, I presume due to nitrogen
> oxides.
> 
> I see media in a future implementation, but it is currently low priority.
> 
Media certainly is an option. However, before that, have you seen this 
(2005)?
 
http://news.povray.org/povray.binaries.images/thread/%3C424df1e1%241%40news.povray.org%3E/

> Attached are 1st and 4th generation scenes.  I wrote the first
> generation render rig in 2003 withing a month of downloading POV-Ray,
> and as you can see, the sky is just a plain background.  The 4th
> generation scene has the hills maxed out at 5000 meters, and I
> implemented the rig so that higher elevation caps push the hills
> proportionately further into the background.  It's been a few years
> since I wrote the code, but I estimate the hills are on the order of 20
> km away from the camera.
> 
> A 2nd generation scene is not shown, because it did not provide an
> automatic sky.
>
I like those generation comparisons. Very comprehensive indeed.

-- 
Thomas

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Op 23/09/2021 om 04:33 schreef Cousin Ricky:
> On 2021-09-21 2:27 AM (-4), Thomas de Groot wrote:
>>
>> Yes? However, now I would like to see a combination of both: hills (4th)
>> with haze (3rd). I am effectively missing a (bluish) distant haze in the
>> 4th generation hills, which, you certainly have observed. Similarly, in
>> France, when visiting the Vosges region, one speaks of "La ligne bleue
>> des Vosges" i.e. "the blue line (or silhouette) of the Vosges".
> 
> I can also turn everything blue by using the indoor film setting.
>

Ok. That is through tinted glasses... ;-) Not an option really.

-- 
Thomas

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On 2021-09-22 10:33 PM (-4), Cousin Ricky wrote:
> 
> I can also turn everything blue by using the indoor film setting
As long as I cheated on that last image, I might as well show off the
render rig's white balance settings.

The 3200 K setting made everything so blue that it blew out the blue
channel's dynamic range, so I used UberPOV glare desaturation to keep
the sky and white tiles from going cyan.

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