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On 11-10-2013 19:05, Alain wrote:
> You need to use artistic liberty by not using realistic proportions if
> you want the ring and the sun to be both visible.
>
I think that is the answer indeed. From earlier attempts here to model
space objects to scale, that same conclusion was drawn iirc.
Thomas
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On 12-10-2013 9:07, Thomas de Groot wrote:
> On 11-10-2013 19:05, Alain wrote:
>
>> You need to use artistic liberty by not using realistic proportions if
>> you want the ring and the sun to be both visible.
>>
>
> I think that is the answer indeed. From earlier attempts here to model
> space objects to scale, that same conclusion was drawn iirc.
>
...I know. This seems to contradict my earlier question ;-) I just
forgot about how huge space really is, and about those earlier attempts.
Thomas
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> Thomas de Groot <tho### [at] degroot org> wrote:
>> Looking good imo. Land/sea distribution is much better than the
>> randomness in my macro. What K do you use for the sun colour? Around
>> 6200 or lower fairly yellow, but indeed may not look as such in space,
>> or from the surface. The glare makes it white I suppose.
>>
>> One question though: are the overall proportions of the system right?
>> From the image I suspect that the Ringworld is much too wide compared
>> to its diameter. See attached table.
>>
>> Thomas
>
> Thanks!
>
> I'm using 6500 for the K.
>
Then it's logical for it to be white, as the default Lightsys
whitepoint is exactly 6500K, IIRC. Try changing the whitepoint to 7500K
or so, and you should get it more yelowish.
--
Jaime
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Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
> > I'm using 6500 for the K.
> >
>
> Then it's logical for it to be white, as the default Lightsys
> whitepoint is exactly 6500K, IIRC. Try changing the whitepoint to 7500K
> or so, and you should get it more yelowish.
Perhaps I'm missing something, but wouldn't it be more logical to use the Sun's
actual temperature (~5800K) than to change the white point?
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"Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> The Sun's surface temperature is about 5800K. I read some time ago that it is
> slightly bluer than a black body of the same temperature, but I cannot now find
> information about that.
>
> The Sun does look whiter in space than from Earth, because from Earth, the
> atmosphere scatters out some of the shorter wavelengths. That's why the sky is
> blue. If you combine the blue of the sky with the yellowish-white of the Sun,
> you'll get roughly the actual color of the Sun (although not exactly, because
> the atmosphere does absorb some color).
>
> Note that even from Earth, the Sun is not as yellow as most people think it is.
> A sheet of white paper in direct sunlight indoors (where the blue from the sky
> is mostly blocked) still looks white, doesn't it? That the Sun is thought to be
> yellower than it really is seems to be some psychological effect that to my
> knowledge there's no definitive explanation.
What value for lumens should I use? 1 lumens seems a little dark, so I set it to
2 instead.
Mike
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Here's another render. The sun shields are not in place yet. I also want to move
the camera a bit closer to the ring.
Mike
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Attachments:
Download 'ringworld_new_scaled.png' (83 KB)
Preview of image 'ringworld_new_scaled.png'
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Looking good imo. Land/sea distribution is much better than the
> randomness in my macro. What K do you use for the sun colour? Around
> 6200 or lower fairly yellow, but indeed may not look as such in space,
> or from the surface. The glare makes it white I suppose.
>
> One question though: are the overall proportions of the system right?
> From the image I suspect that the Ringworld is much too wide compared
> to its diameter. See attached table.
>
> Thomas
One thing I'd like to know is how many shadow squares are there supposed to be?
If they're supposed to be 2500000 miles long and 13000000 miles from the center
of the sun, then there should be 41 of them assuming they're spaced equally
apart.
Is that right?
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"posfan12" <nomail@nomail> wrote:
> One thing I'd like to know is how many shadow squares are there supposed to be?
>
> If they're supposed to be 2500000 miles long and 13000000 miles from the center
> of the sun, then there should be 41 of them assuming they're spaced equally
> apart.
>
> Is that right?
Damn my math!
That should be ~16 not 41.
Mike
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"posfan12" <nomail@nomail> wrote:
> What value for lumens should I use? 1 lumens seems a little dark, so I set it to
> 2 instead.
That I don't know, although it's been on my to-do list.
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"Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> "posfan12" <nomail@nomail> wrote:
> > What value for lumens should I use? 1 lumens seems a little dark, so I set it to
> > 2 instead.
>
> That I don't know, although it's been on my to-do list.
Also, does the light have a falloff rate? How do you configure falloff with
Lightsys IV?
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