Celestia Forums

Hi, I've finally finished my first add-on called Rabud System for you to download.

Go to http://www.celestiamotherlode.net/creat ... system.zip
to download this beautiful system. Then, when you finish to use, please send me an answer if you liked it or not.

kikinho wrote:when you finish to use, please send me an answer if you liked it or not.

Well, you asked for it. Too bad.

I've tried your addon, and, to be perfectly honest with you, I hated every aspect of it. Sorry.

Better chance next time, maybe.

Cham wrote:

kikinho wrote:when you finish to use, please send me an answer if you liked it or not.

Well, you asked for it. Too bad.

I've tried your addon, and, to be perfectly honest with you, I hated every aspect of it. Sorry.

You could perhaps just be a teensy bit more constructive as to why you hated it? It is his first system after all.

And I had a very hard work of doing this system...
But, what you didn't liked exactely, the planet textures, the orbits, the star...
Please tell me for I can do a better system next time.
And note that this is my FIRST system, so I don't have too much experience of doing textures.

Cham wrote:

kikinho wrote:when you finish to use, please send me an answer if you liked it or not.

I've tried your addon, and, to be perfectly honest with you, I hated every aspect

Not liking it is ok - but if someone bothers to share their work with the community, and you post about it, it would be nice to offer some constructive criticism. This is a first work, at that - do you want to scare people off?

First impressions:
Some of your maps is very beautiful (i expecially like the star!)
I understand this is meant to be fantasy, and so i won?t comment on the realism. But i feel that your fantasy could be a little more consistent with itself - i mean, not mixing realistically looking worlds with more cartoonish ones. In my opinion, that would make the add-on stand out more as a coherent piece.

Sadly, i can?t see your asteroids, as they are CMODs, which does not work on OSX.

-rthorvald

Here's why, in my opinion, this addon is bad :

1- there are some references to 3ds models in the ssc, which aren't there.
2- the asteroids aren't visible.
3- the textures are very crude, despite the large size. And many of them feels unauthentic.
4- the orbits are really unrealistic at all. The asteroids are all in the same plane, in a too much ordrered way.
5- there are two earth like planets, one orbiting very close to the other, and this feels totally unrealistic.
6- there are some patterned like textures, which can't have a natural feel.
7- three planets have the same cloud layer.

Well, if you want to do some addons, make a small one first.

As I sad, this is my first addon and I am not so well experienced in making textures. About the asteroids, the CMOD format works perfectly in my computer. I use Windows 98 and Celestia doesn't show any problems to me. And most of the textures I did piece per piece. I had much hard work because of this.

I put the orbits of asteroids in plane because I like more organized orbits than elliptical or inclined. I like to create very organized systems.

But the next system I am doing I put quite elliptical and inclined orbits for asteroids, moons and planets. Some textures will have some more details, the cloud layer is different in planets, but not in moons. In moons the cloud layer will be based on triton and martian clouds.

Also, this system will have two earth like planets, but this time they are not orbiting more one to another, they are in different distances to the star. One of the earth like planets will have a green and yellow atmosphere color because of the higher atmospheric pressure. The color of water will also be affected, turning it to be yellow instead of blue.

The names of the planets are similar to our planets, but with some differences.

The first planet is the bigger rocky planet in the system. This planet is so hot that iron is liquid! The interior of this planet is very rich in liquid iron, uranium and other very heavy elements.

The second planet is an earth like planet, but the life is only in water, because in the summer, the temperature is higher than the boil point of water and in the windy, the temperature is quite higher than on our planet. The beings in this planet only live in water because in the deep ocean, the temperature is similar to our planet, and not in the surface.
The atmosphere is blue/yellow/green because of the high concentrations of oxigen, sulphur, some phosphorus, nitrogen and dioxide carbon.

The third planet I sad above.

The fouth planet is a martian like planet, but is blue instead of red and the atmosphere is blue. Unlike mars, the interior is highly active and have liquid water in it. The crust is made of ice. This place is like Europa, but unlike Europa, it doesn't have the lines in surface and the beings of this planet lives in the deep ocean under the crust!

The fifth planet is a gas giant with two major moons, one of them is bigger than Mars, but I still aven't finished yet.

And finally, what do you think of all these explanations?

kikinho wrote:please send me an answer if you liked it or not.

A first advice: provide a MedRes pack of your work (i.e, NO 4k text, and maybe other(s) format(s) than DDS) please. Nobody like to download a big addon that cant work on his install The better way seems to me to share a little Medres pack that is readable for the maximum of different installations, and another addon, a Complete one or the only textures/hires folder to add, as you prefer... IMHO.
(Different formats can be drawn, passing 'lores, medres and hires' stages in Celestia, if the Texture line in the .ssc file says "planetsurface.*", yes?)

Jeam, wich have no time to convert all your textures to run well your addon, so have no comment on its look in action for the moment , sorry... ( But I'll notice it on a next update of my 'Fiction' pages, without screnshots)

Sorry, but I put textures in DDS format because the PNG format waste more time to load textures than DDS.
And I put in hires folder because the textures are large.

kikinho wrote:Sorry, but I put textures in DDS format because the PNG format waste more time to load textures than DDS.
And I put in hires folder because the textures are large.

So, when we cant read DDS or large textures (more than 1k or 2k), we cant make your stuff to run fine. And cant see how we find it.
Consider a smaller version as an abstract of your work to present it for more people, and you will have more comments, IMHO (this is a 51Mb pack)
Jeam (I am understanding your point of view, but hoping to point under your planet views with my poor standing.)

Hi, I did a new version of Rabud system. All files now are in MEDRES folder and all are in PNG format.
There is also a new folder called "Star Textures", so if you want to put a better texture for stars, go to this folder and copy all files to your MEDRES folder. I still haven't uploaded the new version, but soon I will.

kikinho wrote:I put the orbits of asteroids in plane because I like more organized orbits than elliptical or inclined. I like to create very organized systems.

I personally don't like organised systems. I express this in the Lera Solar System, the ecliptic plane is all over the place! On top of being inclined, the orbits of my worlds also can be a bit eccentric.

Michael Kilderry

kikinho wrote:Hi, I did a new version of Rabud system. All files now are in MEDRES folder and all are in PNG format.

Thanks Kikinho, it works fine! I'll add some pics in a next update of my fictitious systems pages on my catalog. Jeam

Hi, go to http://www.celestiamotherlode.net/creat ... es_PNG.zip to download my fixed version of Rabud system. All texture files are in medres folder and all files are in png format.
Note that there is a black planet in my system. It's not a bug, it's a super dense planet that looks like a black hole with rings, atmosphere and moons. The asteroids now have more realistic orbits.

Someone downloaded my fixed version of Rabud system? If you downloaded and saw it, did you liked it? Or the textures are still painting balls?

Someone downloaded my fixed version of Rabud system? If you downloaded and saw it, did you liked it? And about the textures? Are they fixed or are still painting balls?

Hello kikinho,

I downloaded it, and have had a look. It worked for me on my system, including the asteroid CMOD.

I'm usually fastidious about realism, so I find it's not 'up to scratch' in that sense, maybe why Cham disapproved. However, I find it very reasonable for a typical science-fiction system, as I encounter them. Also, rather good for a first effort add-on.

Oh yes, this thread should have been posted in the Add-Ons forum .

Details:

You've used a W star. These are massive, luminous and very hot. I think all planets you've defined would be scorched, not just the first.

I guess your first planet Hibrocadim uses the m-star texture to represent a molten surface, and you made it glow. For fun, try the m-star texture as a night texture, and remove the emissive true term...

You seem to have a lot of Earth-sized worlds that have just one large moon. Rather flukey, but I guess you like large moons and Earth-sized worlds.

Yes, I see the use of computer generated textures that look more like maps than surfaces. Most of us are limited in making really good textures for planets. But the other blue-white (ice?) worlds are quite good attempts.

A good mimic of the Jupiter satellite system for your large gas giant: small but regularly orbiting asteroids close in, larger satellites further out, and 'captured' asteroid in scattered orbits further out again.

Your Tihocanuaran-Ourimia system puzzles me. You try to have a small moon orbiting both these planets (a 'double planet'?), but you make Ourimia by reusing the Tihocanuaran orbit, with a 0.09° Mean Anomaly offset. The result is that the moon orbits these planets every 18.636 days, but the two closer planets orbit one another only once every 0.6 years. Why not make the two planets and moon orbit a barycentre?

In general, the semi-major axes and periods do not relate via Kepler's law. You've made planet periods in years equal their distances in A.U. divided by ten, and the moons have their periods in days equal their distances in km divided by 100,000 km. The result is inconsistent implies masses. For example, Hibrocadim thinks the W star mass is 20 sun masses, but Saerimetnoshiba thinks it orbits 7,200 sun masses. There's a similar problems with moons. You need to have in mind a mass for the star (W starts are 10-30 solar masses), and also each planet.

I note the ascending nodes and arguments of perihelion aren't dealt with. Several moons have no rotation period, or axial inclination, etc...

The planet/moon names are certainly good. Where do they come from?

Spiff.

I like to create strange names. These names were made by the extraterrestrials living in this system. The orbits are not so good because I don't know too much about planet masses and kepler laws. And there are some calculations that I can't make, because it's too big or difficult for me. The big problem is that I don't have some notions about physics. Thats why my systems look like unrealistic. I only did a system in a W star because I think nobody wanted to do a system in this special kind of star.

You will see my next addon... the biggest name I did is for a spaceship and is very, very simple...: Novalumercobasterinocomuterlaiscoverdometeilonismirantercrombarkrostermoloispirtingrus.

What do you think of this name for a alien spaceship?

Ah... and my next addon will have many systems. The major system have 40 planets and a G6V star with a size of 0.94 Rsun. Each planet and moon ( major moon ), not asteroidal, will have it's unique texture. The textures of my next addon will be very better than in Rabud system.
All stars in my next addon are orbiting a pulsar in the middle of a very beautiful nebula.

Hello kikinho,

kikinho wrote:The orbits are not so good because I don't know too much about planet masses and kepler laws. And there are some calculations that I can't make, because it's too big or difficult for me. The big problem is that I don't have some notions about physics. Thats why my systems look like unrealistic. I only did a system in a W star because I think nobody wanted to do a system in this special kind of star.

I'd recommend you keep the spacing of your orbits, and correct the periods to match - your orbit sizes are reasonable. If you wish to make realistic orbital periods, here's what to do (I've tried to make it simple):

1. Decide a mass M for your central star. For the W star I recommend the 20 solar masses your first planet is matched to. (By the way, the reason not many choose a W star to put planets around is that these high power stars are so short lived (millions of years, rather than billions of years) that professional astronomers think planets don't have much time to form around them, or they'd be so young, that they'd not evolve even microbial life).

2. For planets, the Celestia standard is to specify an orbit's semi-major axis in A.U., the period in Earth years, and the orbited mass in solar masses. If your planet's semi-major axis measured in A.U. is A, then the period P in Earth years is calculated as the square root of P ? A ? A ? A.

Here are the corrected periods for your Rabud planets:



See if you can calculate the same numbers...

3. For moons of planets, you have to define a mass for the orbited planet in Earth masses (not solar masses). To get a moon's orbital period, it's like above, but you have to adjust for the different Celestia measurement standards for moons: Earth masses for orbited mass, Earth days for period and km for semi-major axis. Then, use this equation for P, M and A:

P = 27.321661 ? SquareRoot ( M ? A ? A ? A / 56,800,235,584,000,000 ) )

The equation's a bit more complicated, but the principle is the same.

4. If you want to make realistic masses for planets, try this. If you know the radius of a planet in km (R), then its density in Earth masses is:

M = 4/3 * 3.14159 * R * R * R * Density

Density is relative to Earth's average density ( 5,520 kilogrammes per cubic metre, or kg/m? ): Density = planet density divided by Earth's density. So, you just need to know typical densities for planets of certain sizes or compositions:

Terrestrial planets: 3,000 kg/m? to 6,000 kg/m? (Mercury 5,250, Venus 4,950, Earth 5,520, Moon 3,450, Mars 4,600).

Ice giants : 1,000 kg/m? to 2,500 kg/m? (Uranus 1,200, Neptune 1,800 ).

Gas giants: 500 kg/m? to 1,500 kg/m? ( Jupiter 1,350, Saturn 700 ).

Light brown dwarf: (10 Jupiters) 10,000 kg/m?.

Heavy brown dwarf: (80 Jupiters) 1,000,000 kg/m? (yes!).

Some materials.
Air you breathe: 13 kg/m?.
Water/Ice: 1,000 kg/m?.
Rock: 3,000 kg/m?.
Iron, Nickel: 8,000 kg/m?.

kikinho wrote:You will see my next addon... the biggest name I did is for a spaceship and is very, very simple...: Novalumercobasterinocomuterlaiscoverdometeilonismirantercrombarkrostermoloispirtingrus.

What do you think of this name for a alien spaceship?

Er, not very memorable...? . Watch out that you don't hit a software limit with string lengths, and I think people won't like typing that name into anywhere!

kikinho wrote:Ah... and my next addon will have many systems. The major system have 40 planets and a G6V star with a size of 0.94 Rsun.

No particular reason why a G6V star can't have 40 planets, just so long as their orbits are not unstable through perturbations...

Spiff.

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