addon for our sun

[Vincent]

Hi,

Here's a little addon (download here and unzip directly in your extras folder) to use with the default flare texture in order to add an "atmosphere effect" to our sun. I don't guarantee that these are TRUE COLORS ( ), but our star looks a little bit less pale like that...

I added to the ssc file a very light version of Runar's wonderful addon (you can download the complete version from the motherlode.)

Feedbacks are welcome, in order to make the color more accurate if necessary.

[BrainDead]

Hey, thanks very much Vincent...

This display is way cool to watch, and makes an otherwise boring celestial
object very interesting indeed.

Very nice, and thanks again.

[ElChristou]

Hello Vincent,

I find the halo too regular, so test this:

Code: Select all

"sol_atm" "Sol"
{
        Emissive      true
        Radius          200000

        Atmosphere
        {
        Height          4000000
        Lower         [ 0.5 0.3 0.05 ]
        Upper         [ 0.2 0.2 0.2 ]
        }

        EllipticalOrbit
   {
        Period         1e25
        SemiMajorAxis      1e-20
        Eccentricity          0
        Inclination      0
        }

        RotationPeriod       1e10
        Obliquity      0
        EquatorAscendingNode   0

}

"sol_atm2" "Sol"
{
        Emissive      true
        Radius          200000

        Atmosphere
        {
        Height          2000000
        Lower         [ 1 0.6 0.1 ]
        Upper         [ 0.25 0.2 0.1]
        }

        EllipticalOrbit
   {
        Period         1e25
        SemiMajorAxis      1e-20
        Eccentricity          0
        Inclination      0
        }

        RotationPeriod       1e10
        Obliquity      0
        EquatorAscendingNode   0

}


What do you think?

[BrainDead]

Hello Vincent,

I find the halo too regular, so test this...

Sorry, but you lost me completely here.

How does this relate to the add-on? I know it's probably just
another dumb question, but I don't understand where this
code should go to have any effect on Vincent's add-on.

Sorry.

[Vincent]

Hello Bob,

Thanks for your positive feedback !

In fact, the code Chris wrote is another version of the sun_atm.ssc file I made for the addon. You can open it by a right click/open with/notepad (or any other text editor).
To try Chris' version, you must paste the code into a notepad document and save it as sun_atm_2.ssc
Then change my original file as sun_atm.ssc.no. You will be able to activate it back by renaming it sun_atm.ssc.

Chris,

In my original version, I really like the halo that stops just before the circle of the flare texture.
But your idea to add a second atmosphere is interesting, maybe to add a redish halo around the sun. Thanks !

@+
Vincent

[ElChristou]

In my original version, I really like the halo that stops just before the circle of the flare texture.
But your idea to add a second atmosphere is interesting, maybe to add a redish halo around the sun. Thanks !..

Yes... As I use another flare texture, for me it's pretty cool. What I have tried to do is to math a little more the color of the flare texture (white) at the end of the halo... Tweaking with two atmospheres gives you more control in the fading effect...

Bye

[BrainDead]

Hello Bob,

Thanks for your positive feedback !

In fact, the code Chris wrote is another version of the sun_atm.ssc file I made for the addon. You can open it by a right click/open with/notepad (or any other text editor).
To try Chris' version, you must paste the code into a notepad document and save it as sun_atm_2.ssc
Then change my original file as sun_atm.ssc.no. You will be able to activate it back by renaming it sun_atm.ssc.

Thank you for the add-on.

Turns out that I somehow either downloaded your file without the sun_atm.ssc
file, or I simply forgot to install it. In any case, I'm using another "Halo"
texture entirely, so that's why I got so confused. Again thanks for the
add-on and sorry for the confusion.

Take care.

[Fightspit]

It is possible to use this texture for all stars ?

[Vincent]

Salut Fightspit

Concerning Runar's flares, it would be difficult - quite impossible - to make a single version that would work for all stars because the trajectory - via the EllipticalOrbit function - would have to be adjusted to the Radius of each star... Moreover, you'll have to copy and paste a new ssc file for every star...

As for my "atmosphere effect", you'll have exactly the same problems as it needs a ssc file definition. One issue would be to reproduce this effect by modifying the flare.jpg texture. As all stars are sharing this flare.jpg texture, the changes would be visible onto all of them. But I didn't manage yet to get a good "atmosphere effect" by changing only the flare.jpg texture. More particularly because if you use a colored texture, it won't be adapted to other types of stars...

Maybe in a next version of Celestia, this very light version of Runar's moving flares could be added and defined via a "flare_orbit" parameter in the stars.stc files...

And for my "flare/atmosphere effect", an atmosphere parameter could be added in the stars.stc file, as it already exists for planets and other bodies...