Atmoshpere isn't dark during Solar Eclipse. Why?

Anarki · Post #1by **Anarki** » 30.03.2006, 18:32

As I saw yesterday, during Total Solar Eclipse (when Moon covers Sun 100%) a 3-4 minutes night comes to the city. Only beautiful solar corona is visible behind the moon.

But in Celestia Solar Eclipse isn't so beautiful

Even in the middle of eclipse sky stays blue...

This is the photo taken during total eclipse

And this is what we see in Celestia

Is there is any add-on than adds more realism to this great event, when it viewed from the Earth?

rra · Post #2by **rra** » 30.03.2006, 19:51

The moon looking bright blue and the sky also blue
seen from earth can be (dis)abled in the /render/view_options menu under the item "atmospheres" .
The remaning view won't show the corona as nice is in your real image
but its a start ...

Ren?©

Anarki · Post #3by **Anarki** » 31.03.2006, 16:59

Yeah, but in this case sky will be black if even there is no any eclipse at all

All that is needed - make atmoshpere go dark, when luna shadows fall to the planet. Is it possible?

hank · Post #4by **hank** » 31.03.2006, 17:24

Anarki wrote:Yeah, but in this case sky will be black if even there is no any eclipse at all :?

All that is needed - make atmoshpere go dark, when luna shadows fall to the planet. Is it possible?

Note that the entire atmosphere doesn't go dark during a solar eclipse, only that portion of the atmosphere within the lunar shadow. And there is a gradual transition at the edge of the shadow.

But it is certainly possible to write a script which checks if the observer is within both the earth's atmosphere and the lunar shadow and disables the atmosphere if those conditions are met.

- Hank

Anarki · Post #5by **Anarki** » 31.03.2006, 18:11

hank wrote:Note that the entire atmosphere doesn't go dark during a solar eclipse, only that portion of the atmosphere within the lunar shadow. And there is a gradual transition at the edge of the shadow.

Of course, I know it

But it is certainly possible to write a script which checks if the observer is within both the earth's atmosphere and the lunar shadow and disables the atmosphere if those conditions are met.

I think it will be wrong just to switch atmoshpere on/off. What about transition?

hank · Post #6by **hank** » 31.03.2006, 19:15

Anarki wrote:I think it will be wrong just to switch atmoshpere on/off. What about transition?

It's not a question of right or wrong. It's a question of what's feasible in Celestia. I suspect that an accurate simulation of sky brightness at the eclipse boundary would be difficult to implement.

- Hank

Anarki · Post #7by **Anarki** » 31.03.2006, 19:39

hank wrote:It's not a question of right or wrong. It's a question of what's feasible in Celestia. I suspect that an accurate simulation of sky brightness at the eclipse boundary would be difficult to implement.

- Hank

Everything is possible

But scripts are useless in this situation.
To realize this idea author should change program code. I will write about it to the appropriate thread.

But I still can't understand - why shadow transition affects ground and not atmosphere?

hank · Post #8by **hank** » 31.03.2006, 21:14

Anarki wrote:Everything is possible ;) But scripts are useless in this situation.
To realize this idea author should change program code. I will write about it to the appropriate thread.

But I still can't understand - why shadow transition affects ground and not atmosphere?

Yes, everything is possible: just a simple matter of programming. You must be a marketing guy.

The rendering of the ground and the atmosphere involve completely different techniques. This is not surprising, because the brightness of the ground is primarily due to direct reflection, while the brightness of the atmosphere is due to scattering.

- Hank