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On 6/16/2010 3:18 AM, Thomas de Groot wrote:
> "SharkD"<pos### [at] gmail com> 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
>
>
Yes, I'm having the same problem with my spinner colony. Maybe you could
add some sort of lens surrounding the sun that makes it appear as if it
changes position?
--
http://isometricland.com
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SharkD <pos### [at] gmailcom> wrote:
> Yes, I'm having the same problem with my spinner colony. Maybe you could
> add some sort of lens surrounding the sun that makes it appear as if it
> changes position?
Your habitat has windows on the endcaps, doesn't it? What about a view with the
axial sun-tube switched off, but sunlight coming into the cylinder from outside?
With decent radiosity settings this might look very interesting.
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On 6/17/2010 8:39 AM, Bill Pragnell wrote:
> Your habitat has windows on the endcaps, doesn't it? What about a view with the
> axial sun-tube switched off, but sunlight coming into the cylinder from outside?
> With decent radiosity settings this might look very interesting.
>
>
Or both. Not sure yet if I want the colony in a solar or planetary orbit
though.
--
http://isometricland.com
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On 6/17/2010 11:37 AM, SharkD wrote:
> Or both. Not sure yet if I want the colony in a solar or planetary orbit
> though.
>
Or at a Lagrange point, LOL!
--
http://isometricland.com
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SharkD <pos### [at] gmailcom> wrote:
> On 6/17/2010 8:39 AM, Bill Pragnell wrote:
> > Your habitat has windows on the endcaps, doesn't it? What about a view with the
> > axial sun-tube switched off, but sunlight coming into the cylinder from outside?
> > With decent radiosity settings this might look very interesting.
>
> Or both. Not sure yet if I want the colony in a solar or planetary orbit
> though.
You'd want a solar or gas-giant orbit if possible - photovoltaic power
from a close solar orbit, or put out conductor spines to sweep the gas-giants
magnetosphere for inductive power. I vote gas-giant, the view's better and you
don't need to worry about solar weather or heat disposal.
</geekery>
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On 6/17/2010 11:59 AM, Bill Pragnell wrote:
> You'd want a solar or gas-giant orbit if possible - photovoltaic power
> from a close solar orbit, or put out conductor spines to sweep the gas-giants
> magnetosphere for inductive power. I vote gas-giant, the view's better and you
> don't need to worry about solar weather or heat disposal.
> </geekery>
What are "conductor spines", and what might they look like?
--
http://isometricland.com
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SharkD <pos### [at] gmailcom> wrote:
> On 6/17/2010 11:59 AM, Bill Pragnell wrote:
> > You'd want a solar or gas-giant orbit if possible - photovoltaic power
> > from a close solar orbit, or put out conductor spines to sweep the gas-giants
> > magnetosphere for inductive power. I vote gas-giant, the view's better and you
> > don't need to worry about solar weather or heat disposal.
> > </geekery>
>
> What are "conductor spines", and what might they look like?
Just a description, not any particular technical term. The idea is to hang long
wires out radially from your rotating habitat such that they sweep through the
planet's magnetic field and induce electrical currents that can be used as a
power source, just like a really big dynamo.
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From: Thomas de Groot
Subject: Re: The Ringworld revisited (day and night)
Date: 18 Jun 2010 04:34:44
Message: <4c1b2fa4@news.povray.org>
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After some tweaking of the Ringworld and playing with landscape generation,
here is a first test.
1) I wrote the whole Ringworld basics, including Sun and Shadow Squares into
a macro to make it easy to add in any scene.
2) An interesting experiment is to make the area_light of the Sun a tiny bit
larger than the Shadow Squares. It results a bit like the corona
illuminating diffusely the night skies along the ring. THis is not the case
in the present image.
3) For the landscape I made use of John VanSickle's height_field patchwork
macro. It is a bit difficult to control, especially in the areas nearest the
camera (see image) but it results in interesting landscapes.
4) The dark shape to the right is not an artefact but the Rim Wall.
5) I am testing ways of making local clouds but not with anything really
useful till now.
Thomas
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Attachments:
Download 'Ringworld 2010.jpg' (90 KB)
Preview of image 'Ringworld 2010.jpg'
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"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> After some tweaking of the Ringworld and playing with landscape generation,
> here is a first test.
Looks nice! I really need to set aside some time to play with this - another
ringworld-off, methinks.
Don't forget that the rim wall in the book was described as a continuous,
impossibly high mountain range, not a literal wall - although I realise this
will be much harder to model...!
Bill
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From: Thomas de Groot
Subject: Re: The Ringworld revisited (day and night)
Date: 18 Jun 2010 05:10:49
Message: <4c1b3819@news.povray.org>
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"Bill Pragnell" <bil### [at] hotmailcom> schreef in bericht
news:web.4c1b3226325a7df36dd25f0b0@news.povray.org...
> Looks nice! I really need to set aside some time to play with this -
> another
> ringworld-off, methinks.
...This is a rapid test with some clouds and their effects on the landscape.
>
> Don't forget that the rim wall in the book was described as a continuous,
> impossibly high mountain range, not a literal wall - although I realise
> this
> will be much harder to model...!
Yes, that is more difficult, but I think that can be overcome by a local
range locally superposed over/against the basic wall, which is a 1000 miles
high in this image. I have to think about that issue...
Thomas
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Attachments:
Download 'Ringworld 2010.jpg' (73 KB)
Preview of image 'Ringworld 2010.jpg'
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