Posts by omega13a

by omega13a
09.07.2012, 17:38
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I didn't notice the density problem until the day before yesterday when I generated a solar system with a rather large brown dwarf that stargen said was about 1/100th the mass and twice as dense as my estimate of its star despite it having a radius greater than that of its star. Kind of a physical i...
by omega13a
08.07.2012, 18:41
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I discovered by accident that you shouldn't take the density for jovians and brown dwarfs in the modified stargen seriously. It can be way off. The reason why is because it adjusts their radius based on their mass but doesn't adjust their density afterwards. To correct this change: //seb: recalculat...
by omega13a
06.05.2012, 19:23
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I was able to get it to work. You need to have it adust the planet's albedo and estimated temperature in a while loop. Please note that this does not adjust the albedo for gas dwarfs smaller than 1 earth mass. In const.h you add: #define CLASS_I_ALBEDO (0.57) #define CLASS_II_ALBEDO (0.81) #define C...
by omega13a
05.05.2012, 23:02
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I've read wikipedia's entry for Sudarsky's extrasolar planet classification and noticed that the expected albedos for the different classes of gas planets are different. I'm going to see if I can find some way to work that into stargen as well as into my solargen.
by omega13a
25.04.2012, 22:06
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Well, at 31 AU, I think it would be safe to say anything that big is a gas planet. In the 'hot zone', ecosphere and the inner part of the 'cold zone', it would be more realistic being called rocky.
by omega13a
25.04.2012, 02:33
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Possible Bug: Running this command: moon_orbits -a 31.2801 -m 38.3735 -M 0.9800 -n p10 -N 43 -s 575204 -S DEL Pa gives me this result: moon_orbits v1.19 Planet name = p10 Planet mass = 38.3735 Planet SMA = 31.2801 Star name = DEL_Pav Star mass = 0.9800 Random seed = 575204 Number of Moons = 43 File ...
by omega13a
24.04.2012, 21:56
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Okay. I forgot to mention, I'm still working on my StarGen re-write. I decided to rename it SolarGen because of the changes I'm making to the source code. Things are a bit more object oriented. I don't have anything that is 'useable' right now. All I have at this point is something that displays the...
by omega13a
24.04.2012, 02:36
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

It compiled with gfortran. However I noticed something. It is very rare for it to generate a moon that orbits in under a week around a gas giant. I've made moons for probably a dozen or so gas giants and out of them, only two have a moon that orbits in under a week. I find that a little odd consider...
by omega13a
16.03.2012, 16:28
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

A while back, I started to use stargen's code to make my own solar system generator. Maybe it would be better if I took the algorithm in the moon orbits thing and put it in it...
by omega13a
14.03.2012, 21:40
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I think the best approach might be to either have the masses of the moons decrease at a quicker rate. I also think it would be a good idea if there was something in the code that would force the loop to stop after so many itterations. It may not be realistic from a scientific point of view but it wo...
by omega13a
14.03.2012, 19:41
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I noticed one thing about moon_orbits that is somewhat of an irritation. Lets say stargen generates a solar system that has a brown dwarf that is like 5000 earth masses and tells you to run the moon orbits program to generate 170 moons. You run the moon orbits program command it tells you to. The Mo...
by omega13a
08.03.2012, 23:19
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I'm getting some rather... odd results for moon orbits. All the moons being generated for a signle planet have the same eccentricity, argument of perhilion, longitude of the ascending node, and mean anomoly. To make it more odd, their argument of perhilion, longitude of the ascending node, and mean ...
by omega13a
08.03.2012, 21:18
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Thanks! There is one small typo in the read-me file for moon_orbits.

Code: Select all

g77 moon_orbit.f -o moon_orbit

should be

Code: Select all

g77 moon_orbits.f -o moon_orbits
by omega13a
07.03.2012, 23:47
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Cygwin doesn't want to install properly under Wine. :( I guess I'll have to compile the moon generaters code. Edit: I also fixed somemore bugs regarding moons, the most import one was one that caused the program to crash when outputing a spreadsheet for a system that had a moon with an atmosphere. Y...
by omega13a
07.03.2012, 19:43
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

I think all you'd have to do is insert your moon code at the end of the (modified) Celestia output code. However, I think the experimental code which uses planetesimals to generate the moons needs a lot of work. When I tried it, it seemed to generate only 2 or 3 moons at most. That's why I added an...
by omega13a
06.03.2012, 23:18
Forum: Petit Bistro Entropy
Topic: Modifying StarGen
Replies: 51
Views: 19550

Re: Modifying StarGen

Very interesting modifications. I've been tweaking StarGen myself. I found a solution for outputting moons for ssc files. I haven't looked at the source code to see if my modification is compidable. What I did was replace the celestia_describe_system function in display.c with this: void atmosphere_...
by omega13a
03.02.2012, 22:39
Forum: Utilities
Topic: Gencelestia. New app for create a .ssc and .stc files
Replies: 7
Views: 6743

Re: Gencelestia. New app for create a .ssc and .stc files

Not bad. However, it would be nice to have a field for normal maps.
by omega13a
24.01.2012, 05:50
Forum: Bugs
Topic: Planets around a star in a binary system not listed
Replies: 2
Views: 3898

Re: Planets around a star in a binary system not listed

I've been looking at the source code and some 'expirementing' and I think I found out the cause but I don't know how to fix it as I haven't found exactly where in the code the mistake is. Apperently celestia looks for the nearest object that has planets when you go to the Solar System browser. When ...
by omega13a
01.01.2012, 01:44
Forum: Bugs
Topic: Planets around a star in a binary system not listed
Replies: 2
Views: 3898

Planets around a star in a binary system not listed

I'm using Celestia 1.6.1 on Fedora Linux. This bug may effect other versions/oses. Lets say you have a binary star system like Alpha Centauri and you go to create a system of planets for both of the stars (one system of planets for one star, another system for the other), the planets around one of t...
by omega13a
25.12.2011, 04:38
Forum: Add-on development
Topic: Feedback needed for a Star Trek related addon pack (UFC-892)
Replies: 1
Views: 2916

Feedback needed for a Star Trek related addon pack (UFC-892)

http://fedtrek.com/staff/omega13a/celestia/UFC-892/UFC-892.zip This is still a work in progress (I want to add some small moons to some of the planets and maybe an asteroid belt). I used a modified version of stargen to create most of the info for the planets. You can view the original data at http:...

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