[BUG]Sky Turbidity < 2.0 = black sky in .8t1 & .8t2

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zsouthboy
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[BUG]Sky Turbidity < 2.0 = black sky in .8t1 & .8t2

Post by zsouthboy » Sun May 13, 2007 4:25 pm

It is as the title says.

I miss my smooth blue skies!

This is with hybrid on, bidir.

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suvakas
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Post by suvakas » Sun May 13, 2007 8:57 pm

Yes, I've noticed that too.

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Kram1032
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Post by Kram1032 » Sun May 13, 2007 10:18 pm

you mean, entirely black?

the turbity is the value, how múch of the sunlight is scattered.
With very low values, no light is scattered, the sky turns black.
Normal values (between 2-5) will give a blue sky. very high values will the sky appear greyish in shades of light with lower frequencies:
20 I.e. gives a somewhat grey-green sky.
I guess, such hi values would be cool for a venus shot, or such.
Moon or Mars would require very low values.

I GUESS, the value is logarithmic...
But ask Ono or one, who knows that in detail ;)

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suvakas
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Post by suvakas » Sun May 13, 2007 11:46 pm

I'm not 100% sure, but i think turbidity<2 worked in older versions.

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Kram1032
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Post by Kram1032 » Sun May 13, 2007 11:49 pm

I did such tests with 0.7.(I think)5, where it was the same.
Ono wrote in the chats some minutes ago, that values out of range will give unrealistic results, but with the comming up new sky model (don't ask me, exactly...), it will work propperly :D

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suvakas
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Post by suvakas » Sun May 13, 2007 11:52 pm

There is a new sky model coming?
cool 8)

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CTZn
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Post by CTZn » Mon May 14, 2007 12:42 am

I don't think turbidity is supposed to go below 2 anyway in the model used, but it can go much higher than 5 (like 30 or so).
obsolete asset

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Kram1032
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Post by Kram1032 » Mon May 14, 2007 1:10 am

2-5, as Ono said.
lower or higher values wont be 100% right.

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zsouthboy
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Post by zsouthboy » Mon May 14, 2007 4:02 am

Okay - well 1.5 I used all the time in previous versions.

No biggie :)

tinman999
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Post by tinman999 » Mon May 14, 2007 5:30 am

Kram1032 wrote:2-5, as Ono said.
lower or higher values wont be 100% right.
the model was design for 2~6 turbidity outside this range is inaccuarate

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Kram1032
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Post by Kram1032 » Mon May 14, 2007 6:16 am

I see...
so 6 still is realitic :D

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