atmospheric conditions, clouds etc. there. But the visible spectrum ought to
be quite different... Below is a guesstimate; what do you guys think, is the colors realistic? Or should the red be deeper, and the yellow tones more muted?
-rthorvald
Titan - light filtering
Titan - light filtering
I don??t see why there should not be rainbows on Titan, what with the
atmospheric conditions, clouds etc. there. But the visible spectrum ought to
be quite different... Below is a guesstimate; what do you guys think, is the colors realistic? Or should the red be deeper, and the yellow tones more muted?
-rthorvald
atmospheric conditions, clouds etc. there. But the visible spectrum ought to
be quite different... Below is a guesstimate; what do you guys think, is the colors realistic? Or should the red be deeper, and the yellow tones more muted?
-rthorvald
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t00fri
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- With us: 23 years 1 month
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Runar,
the theory of rainbows is completely understood, everything can be calculated given some input on the droplets refraction index and their average sizes. In detail the calculations are not trivial, though!
However, I cannot imagine rainbows to occur without /direct/ irradiation of sunlight! Typically rainbows appear right after showers /and/ whith the sun managing to get through some "hole" in the cloud coverage.
I would be very surprised to find such holes on Titan.
Bye Fridger
the theory of rainbows is completely understood, everything can be calculated given some input on the droplets refraction index and their average sizes. In detail the calculations are not trivial, though!
However, I cannot imagine rainbows to occur without /direct/ irradiation of sunlight! Typically rainbows appear right after showers /and/ whith the sun managing to get through some "hole" in the cloud coverage.
I would be very surprised to find such holes on Titan.
Bye Fridger
t00fri wrote:However, I cannot imagine rainbows to occur without /direct/ irradiation of sunlight! Typically rainbows appear right after showers /and/ whith the sun managing to get through some "hole" in the cloud coverage.
Well, some googling turned up several articles and notes on this, so it seems there are some speculation going on. One of these articles suggests visible rainbows might be uncommon, but not improbable - though it might be common in the infrared.
The article is here: http://science.nasa.gov/headlines/y2005/25feb_titan2.htm
I??m not sure... I like the idea, it adds a nice touch of atmosphere to my project. But maybe it is too speculative?
-rthorvald
-
t00fri
- Developer
- Posts: 8772
- Joined: 29.03.2002
- Age: 23
- With us: 23 years 1 month
- Location: Hamburg, Germany
rthorvald wrote:t00fri wrote:However, I cannot imagine rainbows to occur without /direct/ irradiation of sunlight! Typically rainbows appear right after showers /and/ whith the sun managing to get through some "hole" in the cloud coverage.
Well, some googling turned up several articles and notes on this, so it seems there are some speculation going on. One of these articles suggests visible rainbows might be uncommon, but not improbable - though it might be common in the infrared.
The article is here: http://science.nasa.gov/headlines/y2005/25feb_titan2.htm
I??m not sure... I like the idea, it adds a nice touch of atmosphere to my project. But maybe it is too speculative?
-rthorvald
The article essentially agrees with my views. To me it sounds /highly/ improbable to see a rainbow in the visible, though. Both transparency /and/ sun intensity are low. However, I agree that infrared rainbows look quite probable. So, perhaps one day Celestia will come around to incorporate my old light-filter concepts...
Bye Fridger
Runar,
the rainbow position is related to the observer position. If we can move around on your addon, but the rainbow stay at the same place, then it wont be very realistic !
the rainbow position is related to the observer position. If we can move around on your addon, but the rainbow stay at the same place, then it wont be very realistic !
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"
Cham wrote:the rainbow position is related to the observer position. If we can move around on your addon, but the rainbow stay at the same place, then it wont be very realistic !
Well, it will be relatively pointless to move outside the Hi-Res "bubble" with a radius of about 100 kilometers anyway, so this wouldn??t be too noticeable. Expecially since the rainbow model will be invisible outside it.
But i am no longer sure i will leave it in - for even though there are fictional elements in the project, and even real elements that are inaccurately portrayed, this is deliberately done, and for good reasons (like Celestia??s clipping and depht sorting issues). But whether rainbows can exist in the visible spectrum or not is unclear, and i don??t like to put in stuff i don??t understand.
Another thing entirely: having the rainbow follow the camera... How fun it would be to be able to write an SSC file for the camera - i can think of many interesting uses for that!
-rthorvald