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From: Thomas de Groot
Subject: Early Earth: Pre Banded Iron Formation
Date: 28 Jun 2012 07:54:29
Message: <4fec45f5@news.povray.org>
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I cannot deny my training :-)
This is a view of Earth about 3.0 to 2.5 billion years ago. A very
different place indeed. No continents to speak of, only volcanic
islands; oceans with huge quantities of dissolved iron (greenish tint);
atmosphere without oxygen and lots of methane and othe toxic gases
(reddish tint); a Moon which is closer than today (huge tides); days a
bit longer than today by a couple of hours.
A most significant change will come at about 2.4 billion years ago: the
Great Oxygenation Event. That will be my next scene in this series.
Thomas
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Download 'early earth - pre-bif_01.png' (549 KB)
Preview of image 'early earth - pre-bif_01.png'
![early earth - pre-bif_01.png](/povray.binaries.images/attachment/%3C4fec45f5%40news.povray.org%3E/early%20earth%20-%20pre-bif_01.png?ttop=443866&toff=1800&preview=1)
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The direction of the light on the moon does not match the apparent position of
the sun.
Or is that artistic license?
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Thomas de Groot <tho### [at] degroot org> wrote:
> This is a view of Earth about 3.0 to 2.5 billion years ago. A very
> different place indeed. No continents to speak of, only volcanic
> islands; oceans with huge quantities of dissolved iron (greenish tint);
> atmosphere without oxygen and lots of methane and othe toxic gases
> (reddish tint); a Moon which is closer than today (huge tides); days a
> bit longer than today by a couple of hours.
>
> A most significant change will come at about 2.4 billion years ago: the
> Great Oxygenation Event. That will be my next scene in this series.
>
> Thomas
I like it and I think it's an interesting topic for a series.
Regards,
simone
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Thomas de Groot <tho### [at] degroot org> wrote:
> I cannot deny my training :-)
>
> This is a view of Earth about 3.0 to 2.5 billion years ago. A very
> different place indeed. No continents to speak of, only volcanic
> islands; oceans with huge quantities of dissolved iron (greenish tint);
> atmosphere without oxygen and lots of methane and othe toxic gases
> (reddish tint); a Moon which is closer than today (huge tides); days a
> bit longer than today by a couple of hours.
>
> A most significant change will come at about 2.4 billion years ago: the
> Great Oxygenation Event. That will be my next scene in this series.
>
> Thomas
beautifully executed and nice subject.
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Thomas de Groot <tho### [at] degroot org> wrote:
> ... days a
> bit longer than today by a couple of hours.
Weren't they a bit shorter, with the Earth spinning faster back then?
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On 28-6-2012 22:40, gonzo wrote:
> The direction of the light on the moon does not match the apparent position of
> the sun.
>
> Or is that artistic license?
>
Neither. It is an effect of the sun on the type 3 media. There is only
one light source.
Thomas
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On 29-6-2012 5:05, Cousin Ricky wrote:
> Thomas de Groot<tho### [at] degroot org> wrote:
>> ... days a
>> bit longer than today by a couple of hours.
>
> Weren't they a bit shorter, with the Earth spinning faster back then?
Ouch!!! Of course! My bad. I wonder what I was thinking.... ;-)
Thomas
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On 29-6-2012 2:39, Simone wrote:
> I like it and I think it's an interesting topic for a series.
>
Thanks. This is the second image. The first came in January (topic Early
Earth) but needs some more work.
Thomas
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On 29-6-2012 4:48, nemesis wrote:
s
>
> beautifully executed and nice subject.
>
>
Thanks indeed. Fascinating subject indeed.
Thomas
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From: Thomas de Groot
Subject: Re: Early Earth: Pre Banded Iron Formation
Date: 29 Jun 2012 03:54:30
Message: <4fed5f36@news.povray.org>
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For the sake of comparison: this image uses scattering type 5 with
eccentricity 0.8 and a bit lower scattering colour.
Personally, I prefer the first image.
Thomas
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Attachments:
Download 'early earth - pre-bif_02.png' (584 KB)
Preview of image 'early earth - pre-bif_02.png'
![early earth - pre-bif_02.png](/povray.binaries.images/attachment/%3C4fed5f36%40news.povray.org%3E/early%20earth%20-%20pre-bif_02.png?ttop=443866&toff=1800&preview=1)
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