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From: Thomas de Groot
Subject: The Ringworld revisited (day and night)
Date: 13 Jun 2010 07:58:10
Message: <4c14c7d2@news.povray.org>
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Following up on the thread "spinner" space colony, and taking up againthe
work of 2005, here are two views of Larry Niven's Ringworld, scale 1:1,
during day and during night. Like Niven tells that, during the day, the
"Arch of Heaven" is much less visible than during the night. This is indeed
confirmed by my visit there ;-)
The ground surface is featureless because of the huge scale. A local
landscape should be superposed on it. That will be the next todo.
Thomas
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Attachments:
Download 'Ringworld_1_1_2010_03_night.jpg' (83 KB)
Download 'Ringworld_1_1_2010_03_day.jpg' (20 KB)
Preview of image 'Ringworld_1_1_2010_03_night.jpg'
Preview of image 'Ringworld_1_1_2010_03_day.jpg'
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On 13/06/2010 12:58 PM, Thomas de Groot wrote:
> The ground surface is featureless because of the huge scale. A local
> landscape should be superposed on it. That will be the next todo.
>
Go for it :-)
--
Best Regards,
Stephen
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Looking good. I've been playing with my version too, I'll post when I have
something decent!
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On 14/06/2010 10:14 AM, Bill Pragnell wrote:
> Looking good. I've been playing with my version too, I'll post when I have
> something decent!
>
>
Please do. :-D
--
Best Regards,
Stephen
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Spin ? ;-)
> Following up on the thread "spinner" space colony, and taking up againthe
> work of 2005, here are two views of Larry Niven's Ringworld, scale 1:1,
> during day and during night. Like Niven tells that, during the day, the
> "Arch of Heaven" is much less visible than during the night. This is indeed
> confirmed by my visit there ;-)
>
> The ground surface is featureless because of the huge scale. A local
> landscape should be superposed on it. That will be the next todo.
>
> Thomas
>
>
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"Lightbeam" <st.### [at] free fr> schreef in bericht
news:4c16755b$1@news.povray.org...
> Spin ? ;-)
Yeah... I am not much of an animator, but making the Shadow Squares spin
gives an interesting effect over the Ring, including the penumbra.
Something I had not really realized before is that the lighting of the
landscape is extremely flat due to the Sun being at the vertical of the
landscape. This does not make for very breathtaking vistas I am afraid...
Thomas
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"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> Something I had not really realized before is that the lighting of the
> landscape is extremely flat due to the Sun being at the vertical of the
> landscape. This does not make for very breathtaking vistas I am afraid...
The landscape is described as having the same variation as the surface of any
planet - indeed, the maps of the other worlds from known space are all there,
Mars being a plateau raised by some km to simulate the thin atmosphere. The most
interesting lighting conditions will probably be evening/night-time - the
brightest archlight should be cast from the few next/previous days to
spinward/antispinward.
To be honest, the best way of doing this is probably to pick your position
across the ring width, render a spherical camera view with nothing on the ring
floor, then just use it on a sky sphere/light probe for the landscape scene of
your choice. Not as satisfying, unfortunately... :(
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"Bill Pragnell" <bil### [at] hotmailcom> schreef in bericht
news:web.4c17392c325a7df36dd25f0b0@news.povray.org...
> The landscape is described as having the same variation as the surface of
> any
> planet - indeed, the maps of the other worlds from known space are all
> there,
> Mars being a plateau raised by some km to simulate the thin atmosphere.
> The most
> interesting lighting conditions will probably be evening/night-time - the
> brightest archlight should be cast from the few next/previous days to
> spinward/antispinward.
The landscapes are not an issue indeed, it is the full daylight lighting
which is *uninteresting* in itself. Shadows from trees should become
important items for giving more contrast to the relief.
You are right, interesting effects should be obtained from twilight periods.
This is something to investigate further I think.
>
> To be honest, the best way of doing this is probably to pick your position
> across the ring width, render a spherical camera view with nothing on the
> ring
> floor, then just use it on a sky sphere/light probe for the landscape
> scene of
> your choice. Not as satisfying, unfortunately... :(
This is indeed an idea to follow up. I forgot for the moment the possibility
of a HDRI light probe and shall try that out, although - as you say - this
is somewhat less satisfying.
Thomas
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On 6/15/2010 4:02 AM, Thomas de Groot wrote:
> "Lightbeam"<st.### [at] freefr> schreef in bericht
> news:4c16755b$1@news.povray.org...
>> Spin ? ;-)
>
> Yeah... I am not much of an animator, but making the Shadow Squares spin
> gives an interesting effect over the Ring, including the penumbra.
>
> Something I had not really realized before is that the lighting of the
> landscape is extremely flat due to the Sun being at the vertical of the
> landscape. This does not make for very breathtaking vistas I am afraid...
>
> Thomas
>
>
I know you're trying to stay true to the book, but you could replace the
shadow "squares" with a lattice of some sort that progressively blocks
more or less light in a gradual manner.
--
http://isometricland.com
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From: Thomas de Groot
Subject: Re: The Ringworld revisited (day and night)
Date: 16 Jun 2010 03:18:17
Message: <4c187ab9@news.povray.org>
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"SharkD" <pos### [at] gmailcom> schreef in bericht
news:4c18359b$1@news.povray.org...
>>
>
> I know you're trying to stay true to the book, but you could replace the
> shadow "squares" with a lattice of some sort that progressively blocks
> more or less light in a gradual manner.
>
No, that is not the problem, and in fact the area_light sun already takes
care of the penumbrae cast by the shadow squares like you can see on the
images. The point is that the sun is always at the vertical to the ring
surface, like if you were in the tropics on Earth, and permanently at noon.
This results in very little shadow effects on the landscape, and is why by
the way, photography at noon is not recommended in general. So *real*
shadows will be cast by overhangs, artificial objects, and clouds.
Thomas
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